How to test mercedes radiator fan, A pressure switch that closes on increasing high-side a/c pressure will run the fan. And that is often the biggest improvement of this kind of upgrade on a vehicle. Mar 9, 2023 C-Class (W202) C-Class (W202) C-Class (W202) - Radiator fan always on HIGH, regardless of weather or a/c, this is not normal. Mar 1, 2011 The light was on for a few weeks prior to the fan not working so I don't know if it's related or not. This problem existed before and after the radiator was replaced. The fan clutch is responsible for controlling the operation of the cooling fans. The new fan is "BROSE" brand and part #A203 500 16 93. Here’s how to test a radiator fan relay. Mar 16, 2023 The fan alone will cost between $350 and $500, with the labor adding the other $150 to $250. Aug 20, 2018 When the engine is off, there are a few things you can do to check the fan clutch: Spin the fan. Feb 23, 2023 3. 5 108. A 2008 release of Star Diagnosis is here. You can unplug the fan, and measure its resistance to see if there is continuity. this will apply to T1N sprinters as. It is also important to conduct a pre-test inspection of the fan, checking for any visible damage or obstructions. swap relay K26 (fans) with K21 (blower motor). Make sure you have checked all your electrical issues (fuses and connections) before you order a new fan assembly. I removed wires from relay N75, and put wires to fan direckt from battery, and fan run fine. Sep 5, 2011 Sep 5, 2011. Jul 24, 2017 The fan hub is a mechanical coupling that operates based on the ambient temperature. Sep 22, 2014 Here's a quick and easy test! The ECM controls the cooling fan corresponding to the vehicle speed, engine c. You find the power leads to the fan the jump one of them to a hot 12 volts. That temperature is higher than normal operating . Feb 23, 2021 The radiator fan and shroud assembly for the Mercedes-Benz W204 is only sold as a set and is not cheap. When the sensors in the cooling system of your car detect that the coolant is . Nov 13, 2023 To test a Mercedes radiator fan, start the engine and let it idle for a few minutes. Use jumper wires to power the motor directly by connecting it to the car battery. Is the cooling fan motor working on your vehicle? Here's a quick and easy test! The . yes the electric fan located in front of the radiator. This is a short how-to on replacing a noisy (failed bearing) radiator fan motor on a year 2000 W220 S500. This method is the fastest and easiest way to check the radiator for any faults. I was unable to replicate the events of 2 days ago where the SUV overheated when the cooling fan nor the a/c did not work. This allows the fluid to either flow out, or be contained inside the hub. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Apr 30, 2009 Electric aux cooling fan in front of radiator started running yesterday and will not stop, even with engine off and keys removed from ignition. Our quick discussion about rationality checks and electric cooling fans can help you better understand how P0483 is set. 1991 Mercedes-Benz 300SL. then I control fuse, and i … read more Jul 27, 2014 Do you have a Merc slk R170 and want to know how to diagnose your radiator fan problems? Watch this video to learn the step-by-step procedure and the tools you need. 2-7. The fan is located in the engine compartment, at the front or rear of the radiator. Even a small coolant leak that doesn't leave a puddle on the floor is bound to give you problems. Plenty of room now. I need to change the. #2Sep 4, 2016 (Edited) The test itself is easy. May 17, 2012 MB C240 2004. May 2, 2020 5) If the radiator is 10 years old or more, it's time for a new one. If you notice that your engine is running at higher temperatures than normal . Jan 5, 2016 Usually a faulty cooling fan relay will produce a few symptoms that can alert the driver that service may be required. Any CarIn this video we will demonstrate how to test coolant temperature sensor on any car. They informed me that the blower fan part for our model is part number 1648350507. Sep 3, 2018 The newer fans have 7 blades as opposed to 10 on the older. Replaced the whole radiator fan and shroud and cost me $950 including labor. It comes with the fan assy. There is not near the room/ space on one of these as oppossed to a w126 300 SD. Engine control module uses PWM signal to control fan speed. Engine overheats. Mar 9, 2023 Install the radiator pressure tester at the neck of the reservoir. Use a multimeter to check for power at the unplugged fan connectors. It is visible under the front drivers bumper after removing the belly pans. This same principle is used to control blower motors and. You have to get a few things out of the way to take this radiator out. Locate the electrical connector on the back of the cooling fan. Jun 13, 2010 This is a bench test of a 2001 to 2005 Mercedes C-class radiator fan. e with 25% speed. 3798 postsJoined 2002. Jul 8, 2019 Is your Mercedes Coolant Fan stuck on High? This video walks you through the steps to see what the problem is and how to go about it. Jan 5, 2016 2. Dec 28, 2020 2. You will search for the sensor within the engine block itself, using a drop light if you need help to see it better. Ditto on the thermostat. Aug 29, 2022 #radiator #mercedesbenz #RadiatorfanMercedes Benz A/C Not Cooling - Radiator Fan Run Full SpeedWatch video to know why your Mercedes Benz A/C not working an. At highway speeds, when there’s sufficient airflow over the condenser and radiator, the switch stays open and the fan doesn’t run. Okay, so a few weeks ago I had the A/C on my wifes 2007 E350 4matic wagon recharged at the dealership. Another symptom of a bad or failing ambient temperature sensor is inconsistent cooling. When you shut down engine with clutch engaged, you will not be able to push the blades with fingers. wiring hooked up to a switch inside somewhere with the plug unplugged so when ur at. The most common reasons a 1991 Mercedes-Benz 300SL radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor. "Coolant! Visit Workshop!" Hello, since ~3 weeks now my on-board computer is showing "Coolant! Visit Workshop!". Fuses are ok, removed plug (2 prong at front top of engine) and shorted the 2 contacts in the wire/plug (not on the sensor) and no click or spinning. If your coolant level is low, there is a chance it is pushing air into the cooling system, and the coolant temperature sensor will not read the coolant temperature correctly. Mar 29, 2015 Showing 2 methods, Safety First ! May 18, 2023 Mercedes-Benz W211 models utilize an electronic cooling fan integrated into a cooling fan shroud. If the fan receives a false signal, the fan might not turn on, causing the engine to overheat. The coolant temperature sensor is located on the engine block under the hood. 0 %. If the cooling fan resistor fails or has any issues, it can cause power to be cut off . Check for any blown fuses or a tripping breaker. but i really need some help please. Check the grounds. Jan 6, 2016 2. Engine running hot. It’s used with deeper-pitch fans (2 1/2″ of pitch), and works well with higher operating rpm. May 21, 2011 The item 90 is called : Control Unit - Electric suction fan Let start again : Fuses are OK Sensor is OK Fan small motor directly on the battery turns without problem Mercedes dealer told : electric fan is out of order As the car had a small crash on the top right, I am sure it comes from this Unit Jan 8, 2016 Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue. Radiator Fan. . 5. Check Fluid Levels. In this video, I am testing the electric fan motor for the radiator, from my wife's 2. Aug 24, 2022 In this video I test the engine fan in one of my cars. The most common reasons a Mercedes-Benz ML350 radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor. Nov 23, 2016 This video shows how to repair the engine cooling fan for a 2006 W203 C230 at home. If there is no airflow, there may be an issue with the fan module or another component. When I turn off the car both fans stop working and the car begins to overheat. This is PWM signal so best way to check is scope otherwise 0. Check the connectors as well. The fans are supposed to come on after a certain temperature is reached, like when idling in traffic on a hot day. Unfortunately the one bolt holding it on comes from the inaccessible front of the car, possibly requiring headlight or bumper removal (more great engineering) Mercedes W208 W210 W202 Auxiliary Fan Control . Fan is controlled by engine control module based on engine temperature and refrigerant pressure. If no power is observed at either 87 or 30, the fusible link or maxi fuse has shorted. The cooling fan has an integrated control module to control speed via a control module. Aug 31, 2023 5. Install the outer fan shroud in between the fan and the radiator and make sure the two tabs and the bottom fit into the two slots at the bottom of the radiator. While you can always top of the fluid and see if the problem goes away, keep in mind that both systems are sealed, so if fluids are disappearing, you have a problem you need to look into. The removal and installation itself is not difficult, just be careful working around the radiator as you do not want to damage it. How to inspect and repair a cooling fan that's not working. Jun 4, 2021 this is a brief video to show a simple diagnostic test to see if you have a fan clutch that has failed to produce torque. Next, connect the red lead (positive) to the fuse contact. Need to know the correct process to check for the sensor not working correctly. If the cooling fans are not coming on at all, then this may also be a sign that the fan control module is damaged. The AC is OFF. One of the first symptoms of a potential problem with the cooling fan resistor is engine overheating. ly/H0cDnfN0Kyle Bascombe from FCP Euro is here to show you how to replace the Cooling f. #1Oct 17, 2016. ok so the original fan stopped working, i tested it manually and it just shorts out internally. A common problem is the brushes wearing out and the motor goes open-circuit, or the commutator wears out and it draws very high current and blows fuses or melts connectors/wiring. According to electrical diag in Haynes manual, could be aux fan relay, or temp switch on AC receiver/dryer or another temp switch ("100C/212F"). #1Jul 26, 2021. It still overheats. . 190e 2. One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. If it is, turn off the engine and check the coolant level inside the reservoir. Simply unplug both the wires, negative as well as positive. Jul 24, 2019 That'll not only use less power, be less wear and tear on the fan motor bearings, as well as generate less noise. Jan 12, 2018 A blown fuse is a good indicator of a short-circuited motor. ). 8-10. Temperature dependent. Aug 17, 2012 While having the clutch holding tool is nice, you can do it without that tool as described. I turn the car ON, and the radiator fan turns on about 5 seconds after the car is started, and stays on the entire time the car is on, it sounds like . There's many reasons. It is actually quite easy once you do it as one bolt removes the whole thing. The problem in most cases is a bad ecm so in order to . Run your finger along the edges of the bearing seal on the backside of the fan clutch. P0480 is a diagnostic trouble code (DTC) for "Cooling Fan 1 Control Circuit Malfunction". May 27, 2015 12,132 satisfied customers. The vehicle overheats in town and gets hotter than normal while driving distances. Unplug the connector. If it checks out, test the radiator fan relay. Kevin then suggested that Miles load test the signal wire and substitute it, and that in terms of voltage on this particular wire, he should expect to see: 1-1. Aug 1, 2020 Why is my 2001 2002 2003 - 2007 Mercedes C240 C320 engine fan not coming on, running hot. Mar 18, 2012 Radiator Fan Motor Replacement W220 S500. #2. gauge are also in the front, 1pin or the 1 pin on a 3pin sensor. Some vehicles have a separate coolant temperature sensor for the . Dec 13, 2022 To test the electrical radiator fan of your car, take a wire from the car battery, unplug the radiator fan connector, put 12v+, and ground it into the connector. Sep 15, 2019 HOW TO TEST RADIATOR FAN. 7V to get the fan to be stationary and no actuation. #8Jun 12, 2013. Best way is to drain the Radiator, remove it and blow out the fins on both Radiators. Oct 15, 2023 I have a 1994 e320 Station Wagon Ben that overheats. If you see the engine heating but the radiator fan isn’t, the fan wires could be the culprit. Evaluate the reading. Brochure. Nov 1, 2013 How to test your radiator fan with 12 volts directly from the battery. You will also see how to . 5d, W124 300d 24v, W221 S350 AMG. AAC with integrated control additional fan motor: 15: Valid for engine 156: Terminal 87 M3e connector sleeve: Valid for engine 156, 272, 273: Purge control valve: Valid for engines 272, 273: Circuit 87 M1e connector sleeve Suction-type fan control unit: Valid for engine 629: CDI control unit Circuit 30 connector sleeve A better arrangement for controlling the fan on an air-conditioned vehicle is shown in Fig. be/0a8ZagFlsnEIn this video, Josh walks you through the five most common causes of overheating in your vehicle an. Sep 2, 2019 How to test your cooling fan: https://youtu. 1. Jun 9, 2010 The belt can be replaced without removing the whole assembly, but you have to take the cover off of the fan motor and loosen the bolts holding it in. Any CarIf your car is overheating and the radiator fan is not working in this video we will explain how to test your radiator fan a. Alternatively, you can use Zerex G5 in either concentrate or premixed versions. Feb 9, 2022 This is for under-dash fuses. a/c is on low 3. Sep 17, 2017 Shop the Parts used: https://hubs. In addition, the low speed portion of aux fan operation won't work if the refrigerant level is too low. Aug 9, 2023 Check #6 – Faulty radiator cooling fan. Remove the top radiator support bracket. now radiator cooling fan have stopped. If the fan doesn’t spin at all, the bearing may be seized. follow us on Facebook https:/. With any repairs we will always check our work for any errors before starting the vehicle. With the radiator fan mounted to the radiator, you may feel equipped to change it yourself. If you get 12V on one contact and 0V on the other, then this indicates a blown fuse. #1. I have a Benz 2012 C300 4matic Sport. 4amp with a 2500 CFM rating. You. Obviously you will have checked coolant level etc. 45 % of the time it's the. Press the connector and pull it to disconnect it. The car’s cooling system is responsible for carrying heat away to the outside air. Pull the latch for the hood and open it, making sure it is secure before letting go. Apr 4, 2023 First, locate the coolant temperature switch and unplug it. Watching this video will help you diagnose if it is time to replace your radiator fan. If the reading is about 12V, then the fuse is working correctly. Coolant leak: Use a flashlight to closely inspect the radiator tanks, neck, petcock, coolant reservoir tank and hose fittings for signs of leaks. The fan will only turn on if the coolant is above its target temperature (such as on a hot day, stuck in traffic, or after hard driving). All you are going to need. Jul 24, 2021 Today was a good day and the fan and a/c works as it should. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. Figure 3 Inside the relay, the coil . the engine is cold 2. com Nov 14, 2019 413 71K views 4 years ago This video describes when the engine cooling fan will come on. Sep 19, 2008 Yes, when you remove the top cover plate it will be accessable. W201 190 2. Oct 17, 2016 Risdo Discussion starter. Using SDS or equivalent you can read demand for speed as percentage 0-100%. STAR TekInfo. With the engine at working temp put your hand on the top hose and then the bottom hose to see if they are the same temp. Jul 26, 2021 279 postsJoined 2015. Without the cooling fans running properly, you will be at risk of having the car overheat. Check by hearing for the fan to turn on. 5 postsJoined 2016. Check the hoses, radiator and around the engine for leaks. You wi. Without the radiator fan, your engine can run hot and be at risk of overheating. As the fluid flows out, the fan hub grips . at my local MB dealership. Step 2: Checking fan operation. Old or contaminated coolant: Check the coolant color. 985 I assume) Radiator fan doesnt work at all and car overheats. Aug 7, 2022 Give the water pump hose a quick jostle as well to see if the problem might lie there. 1972 280SEL 4. The plastic front grill cover comes off, the top cover plate comes off, then the clips, etc. If the coolant level is low, you need to top up the coolant reservoir. It’s recommended to consult a professional for further testing and. All tests to be done while fan is in high demand. It claims to draw 12. The cooling fan motor powers the cooling fan, which keeps the engine from overheating. May 10, 2009 Pic 2: Electric fan installed. " Believe it or not, a bad fan motor can cause you to find no power to the fan. Because, some vehicles have as many as three: One for a, dashboard warning light. 2 or 3 pin. We have enough cour. it will send a CAN message to the AAM to turn on the aux. Make sure the fan control module in in the proper location and seated fully. Understand that the wiring colors might not be the same for non US models. Jun 4, 2013 S4toML Discussion starter. Unplug the electrical connectors to the radiator fans. Your cooling fan will usually be inactive, but if your car is stationary (with the engine running) or the temperature starts rising, it will kick into action. Pic 3: Bought this 16" fan from ebay. As the ambient temperature sensor plays a direct role in the automated function of the AC system, when it is having a problem this may interfere with the system’s ability to cool the vehicle. Brand new for $30. Aug 12, 2016 Step 2: Check for leaks. I didn't want to pay $600 dollars for a new fan so I decided to repair . Engine temperature or high a/c pressure. Jun 30, 2022 Mercedes-Benz ML350. Oct 6, 2021 Step 1: Lift your car and remove splash shields. May 25, 2017 Mercedes Cooling fan Feb 27, 2012 Meaning your fan clutch is engaged, and aux fans working i. A bi-metallic strip on the outside of the hub heats and cools, and expands or contracts, which opens and closes a valve inside the viscous hub. Run the car to get the engine up to temp. Insufficient Coolant. Sep 14, 2023 The cooling fan relay is an electromagnetic switch that controls the power supply to the engine’s cooling fans. Remember, if the A/C pressure is below the required limit then the compressor will not engage. Oct 28, 2021 The cooling fan of this car can be endangered by water splash such that it can malfunction and stop working after a few minutes. Sent fra min H8324 via Tapatalk. The engine cooling fan control modules are: Vehicles equipped with a diesel motor: CDI control unit or the AAC control unit or comfort automatic air conditioning. Before you start throwing a lot of money at it. 6) Refill using nothing but 50/50 MB G48 coolant and distilled water. Aug 8, 2016 Step 1: Check over the installation. Park the car. A faulty relay can be caused by a bad relay control module, ants in the relay, or an electrical short. The fan shroud is different. They said it cost about $510 for the part and $212/labor. Please see fault codes attached from that occurrence. You can do this test with the fan installed in the car or outside the car IT DOES NOT . If your test proves incoming power, replace the fan motor. Feb 12, 2023 1. Low pressure = ac no work = ac fan at front no work. Looks like he found no power to the fan. It might be mechanical or electric, but the engine drives it. a/c . If you don’t see 12 volts . Thought it was the thermostat so went ahead and replaced that. Radiator Fan Module, Fan motor not working how to install. May 21, 2023 5 postsJoined 2019. Changed the thermostat on my E320CDI (in line 6 engine) following the useful tutorial on here. But if the coolant is hot enough anyway, then pull the wires and measure the resistance across the wires to test the sensor and refer to this chart. You need to test if the fan is operating. * At your engine operating temp of 82 your fan clutch should be engaged. The movement of the vehicle while driving forces air through the radiator and A/C condenser (it needs cooling too), but when the vehicle is sitting still, a fan or fans must move the air. Figure 2 Small flatblade screwdrivers can be used to pry the relay out of its plastic housing if you want to visually inspect the internals. Applied 12 volts to the +ve and -ve pins on the fan module and the fan doesn't run. If your find a circuit blown fuse or tripped breaker, the fan motor might be pulling too much voltage, causing the fault. The most common reasons a Mercedes-Benz GLK350 radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor. It is a near drop-in swap for 26" Mopar radiators. We went to the dealer they made a diagnosis and said we need to replace the electric coolant fan because the fan itself and the module is damaged. Be sure to check for leaks from the radiator drain plug, petcock, or the coolant temperature sensor. Install the fan clutch assembly on the pulley and tighten the fastener. Apr 1, 2019 Apr 1, 2019. 2. Managed to get hold of a "working" replacement. 068. Position the inner fan shroud over the fan. - I want to first start off stating that this problem is not normal. Nov 10, 2016 Heavy-Duty Thermal Fan Clutch: This fan style turns the fan at 70-90 percent of the shaft speed when engaged for increased cooling. Apr 24, 2015 Here is the wiring diagram for a 2002 USA model ML. The fan continues to run at its maxiumum speed, regardless of the engine temperature. Check the oil and the coolant, and if either fluid is low, you’ve discovered a critical clue. Mercedes-Benz GLK350. You can listen for the fan to start running when the engine is hot. how to test Mercedes cooling fan. I just got off the phone with the service dept. The radiator and condenser are BRAND NEW. If the engine remains hot, scan the radiator’s surface and check for clogs or faults. May 7, 2009 Probably that module has a problem. This fan is electrically controlled and relies on the signal from the onboard computer. Has the one big electric radiator cooling fan behind the radiator. Morning. If your vehicle's check engine light comes on and after pulling the code you find a P0480 displayed, if refers to the engine cooling fan circuit. Carefully release the hood release cable from the top bracket. Question: When idle, I’ve noticed the ECT climb up to 235 degrees F and . Pic 4: Also bought a Derale adjustable temperature fan controller from the same seller for $45. You find the power leads to the fan the jump one of them to a . If it doesn't. Apr 2, 2020 Is your fan getting louder and louder? Has it stopped working completely? Is your engine temperature rising or are you getting temp warnings in the dash? . If the motor spins it’s in good condition and the problem is either a blown fuse or bad relay. ERIC. first check to see that fuse #44 is not blown. The newer fan blades end in a circumference ring while the older blades don't. #1Sep 12, 2019. ₹ 1,500/ Piece Get Latest Price. Aug 28, 2019 You could test the resistance of the aux fan resistor by removing both aux fan relays K9 & K10 & take a reading across positions 1 in their respective sockets. Faulty Fan Relay. Jul 30, 2023 Immediately upon starting the car, the radiator fan begins to run full speed, even though the car is stone cold. Removed fuse as temporary fix. The easiest way to check this is to disconnect the fan and check for resistance across the terminals. item 20 shows the aux fan control current when the a/c is running. When they make few turns with stopped engine, that easy to . cable. I need to change the front SAM (fuse box) located under the hood. After replacement the message on our on-board computer is still there. Old one was stuck open so car now getting up to temp but as i suspected cooling fan not working. 5V – this will ask ECU to go to maximum. So I cleaned out the radiator. Aug 20, 2011 Location. However, some vehicles can cost more, depending on the make and model, as well as the local labor rates. The fan can also fail, and wires in the circuit can break or become loose. The removal and installation itself is not difficult. Currently have a 2003 ML500. Fan does not come on as temperature rises above 105 degrees, fan runs when directly applying 12 volts. If the engine coolant is hot and up to temperature, the fan should turn on. The newer fans have a bigger overall diameter by about 3/4ths inch. You need to check if the climate controller sends the control current top the pulse module. HOW TO TEST FAN MODULE CONTROL BOX ? Ms908p Scanner: https://amzn. Aug 21, 2018 HOW TO TEST COOLANT TEMPERATURE SENSOR. you can check it with turning off the engine, and move the blades with hand, you should feel resistance. Jan 22, 2022 How to test Mercedes W212 FanHere at Ecuboot, we offer German Automotive Diagnostic Trainings such as: Mercedes, BMW, Volkswagen and Audi. 6. Here are few facts: * Your engine operating system is about 82. He wired the fan somehow and fan would not even turn at all. Cooling fan motor t. It is protected by fuse f5 (125A) located in Front pre-fusebox F32. May 6, 2015 Hey guys, I also have a problem where the electric fans in front of the radiator do not come on. Start the car and let the engine warm up. like turning on the A/C and find out which one lights it up and just set up a different. Aug 3, 2018 Check terminal 15 voltage from fuse F1f22 (blue wire) Check actuation voltage at white wire. If that does not engage then it won't pump the refrigerant around. When disengaged, it turns the fan at 25-35 percent. Sep 17, 2020 Is your electric motor dead? This is how to bench test it, to find out. If the fan spins more than three times, you may have a bad fan clutch. The rad should be BEHR, accept no substitutes. In this video, you will learn 5 symptoms of a bad radiator fan. There could be debris caught between the two radiators, and or the fins could be plugged with debris also. 7. Feb 26, 2011 What I would do is just probe it when its hot or force it on. It is responsible for transferring the motion of the motor to the arms, so that they can move back and forth across the windshield. Find the cooling fan next to the radiator or use your car manual to locate it. Also please see the pictures of the reading from the fan when: 1. This will allow you to access the shield that protects the condenser and the A/C pressure switch. It is clipped to the bottom of the top radiator bracket. The fan cools the coolant as it passes through the radiator. Jan 8, 2023 1. 0 volts. A wiper linkage assembly is a mechanical system that connects the wiper motor to the wiper arms. Jul 29, 2014 If you want to simulate a coolant temperature hot enough to trigger the fans, then a 220-ohm resistor between the sensor wires will work. without AC, the Coolant Temp. See full list on toolsli. Cooling fans not running at all. Thermostat is clean. Does slow down sometimes for short periods. Aug 15, 2008 Hey all, i'm actually working on a crossfire, same setup as a slk320. Jul 15, 2019 196 postsJoined 2012. Example: Testing the radiator cooling fan relay, the cooling fan should be operating. w203 C230 If your radiator or cooling fan is not working and you're trying to find ways on how to diagnose or trouble shoot the problems, then this video might give yo. Sep 9, 2021 How to Test Radiator Fan with Car Battery. Step 3: Check to see if the check engine or low coolant level light is illuminated. ly/H0cMChV0SUBSCRIBE: https://hubs. The internal thermostat (part of the car’s cooling system) senses that the radiator is getting too hot. Take a voltmeter and check for the presence of current. If the ambient temperature sensor fails . Sensor for the coolingfan is on the front. Jun 24, 2017 87 560sl Electric cooling fan help. The car has a non working cooling fan due to fan module malfunction. the strip next time you can force it on. Apr 11, 2011 The electric suction fan (engine & a/c) with integrated control (M4/7) is driven from ME-SFI control module [ECU] N3/10. Jul 28, 2022 OP, these car cooling fans are brushed DC motors. Sep 4, 2016 Kajtek1. It fits perfectly to the SLC radiator. the other connector is a small 2 pin plug that must carry a trigger signal from the ECU when it calls for fan (or if the AC calls for fan) if the aftermarket is just a fixed speed fan, the ECU signal would not . If it comes away with a heavy coating of oil, the culprit is either a crack or a faulty seal. I just don't know how to take it out because I … read more. Electronic types might freewheel, but most fan clutches should spin with a little effort. Inconsistent cooling. Aug 27, 2017 If your vehicle is overheating due to a non-working cooling fan motor, this video will show the steps involved in diagnosing the problem. It is a generic code applying to all OBD II (on board diagnostics) vehicles. Also when you observe the fan while shutting down the engine, the blades will stop immediately. The newer fan shroud covers the entire surface of the condenser, top to bottom and side to side. 4 answers. , and has nothing to do with the Cooling System. You need to put the fan in test mode, then measure the voltage for at least ten seconds. Question: Why is there pressure return to the coolant reservoir, and coolant to hot, but the radiator fan still won't turn on? Answer: Test the temperature sensor. Clear the fault codes on the Climate control and test again after running the engine and see which faults come back. Now your stealership will tell you that if your radiator fan motor is noisy you will have to replace the whole assembly including cowl, fan, motor and drive belt at considerable cost. Jan 4, 2011 Step 1 - Locate Coolant Temperature Sensor. Dec 28, 2023 Disconnect the wires from the horn. Dec 5, 2013 This is a very common problem with the Mercedes radiator cooling fan running constantly on high speed. Doncaster. OK when the engine gets to 3 degrees over the thermostat opening temp about 90c on your car, the visco coupling engages and the fan runs at full speed, if the visco is OK the fan blades should slice a carrot. Feb 27, 2023 The cooling fan, which is behind the radiator grille, removes heat from the engine’s coolant. 3 1989 97kw no AC (M102. The sensor for the temp. Or an, overhead console. Car. Dec 18, 2011 Now this is interesting, maybe a thermostat problem. Then that is your issue. Note that the internal workings of the fan module (black box) is that same as a relay. Apr 13, 2018 How ECM Controls Cooling Fans describes the relationship between the ECM and the FAN control module. Pump until it hits the pressure listed on the radiator cap. R. Cooling fan. To test your Mercedes radiator fan, you will need a few tools, including a multimeter, jumper wires, and a test light. The sensor in the rear of the engine is for the ecu. How to repair a cooling fan in your car DIY with Scotty Kilmer. Jun 21, 2007 "Actually, I saw him check all the fuses and the test the plug for power right above the aux fan. If the pressure drops but you don’t see a leak, assume that you may have a blown head gasket. Apr 14, 2014 Does anyone know how to test the radiator fan? There's 2 large pins and 2 smaller pins on the radiator when you disconnect the connector from the side just below the upper (return) coolant hose. Fan Problems: Unusual noises are a good indication there is a problem with the fan itself. The pressure switch is located directly under the A/C condenser so you will want to start the procedure by lifting the vehicle and removing the forward bumper splash shield. 3. Jul 9, 2021 SDS will test the Fan by running it at different Percentage Speeds anything else is guesswork HVAC controller should run the fan when A/C is on, but that is a separate process to running for Engine Cooling, so even if there is a fault in HVAC, the Fan will still run when needed for Engine Cooling as that comand comes from ME ECU based on actual Coolant Temperature Sep 15, 2023 The 2006 Ford cooling fan criteria for this code is very similar to the 2006 Chevy Trailblazer fan and the pinpoint test leads through a test of circuits, connectors, and components. Ever hear those loud diesel engines, like garbage trucks have? It's usually the radiator fan noise that's the loudest during those repeat accelerations. Vehicle overheating. When the coolant reaches another predetermined degree, the fans will be turned off. You should also check the cabin for heater core leaks. Mar 10, 2022 Turn the ignition to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the accessory should activate, if so the relay has failed. Jul 10, 2009 Failing thermostat will make it overheat at any speed. Mar 29, 2016 the stock fan on my 2000 270 is a PWM controlled variable speed fan, the actual speed controller is on the fan itself in the form of a big heat-sink that the battery cables connect to. Jun 30, 2022 Reasons a 1991 Mercedes-Benz 300SL Radiator Fan Isn't Working. Jul 17, 2014 This part controls the Aux Fan by the radiator / condensor. Then turn your A/C to the MAX position and start the engine. But, be sure you have the right one. Jun 17, 2015 The small radiator is for the AC. Just do it. As you do this, ensure the fan is working correctly, so you have a temperature range around 180℉ to 220 ℉. to/2LCi9AGIn this video we will demonstrate how to test radiator fan and radiator fan con. so i replaced it with a good fan, but that fan doesn't recieve any current to . Pulling the plastic fan shroud up some and out of the way will give you more room to work. Now it is possible that the hot spot in the rad is blocked preventing the hot air from triggering the bi metal strip . Mechanic diagnosed the issue to be the fan. Jan 6, 2016 Usually a bad cooling fan resistor will produce a few symptoms that can alert the driver of a potential problem that should be serviced. Behavior: When moving, temperature hovers around 80-90C. Sep 29, 2023 Most vehicles use a liquid cooling system where the coolant mix carries the heat away from the places the engine is generating it to a place where it can be dissipated. One for the (PCM). Maybe start with these 3 things: First verify that your radiator fans work. If you get a resistance reading, this suggests the wiring & resistor are fine. 38103 postsJoined 2005. The standard direct current they must put out is 12v (approx. Red wire (circuit 30) is fed by 100 amp fuse attached to the positive batt. Mar 23, 2013 1. Mercedes Benz C300 Diagnosing coolant Fan that’s keeps running with the engine all the time Oct 21, 2021 Take out your infra-red thermometer, aim the thermometer on the engine thermostat to take the temperature readings. Carefully wrap the belt around the fan end, then onto the motor shaft (while motor is unscrewed) Once both ends are on the pulleys re-install motor bolts. Jan 17, 2023 The auxiliary fan and shroud assembly for the Mercedes-Benz W203 is only sold as a set and is not cheap. Nov 3, 2022 Fit the fan blade to the fan clutch and tighten the fasteners. Look for the cooling fan. However, when I start car and disconnect the coolant temperature sensor both fans in front of the radiator turn on. Sep 4, 2015 if there's power & ground at harness connector as demonstrated in Video replace cooling fan motor(s) if there's no power check manual fan motor fuse & rela. Check for a shorted wire or replace the fan motor. Since the car is already overheating, the fan or fans should come on as the temperature rises. Feb 21, 2019 First test the fuse for the radiator fan. Since the the engine cooling fan is running on high a LOT! Runs on high upon starting in the morning cold, and almost all the time. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. Just be careful working around the radiator, as you do not want to damage it. start engine and press A/C switch and see that the compressor clutch (red arrow) turns continuously. Spot-check for oil leaks. The cooling fan draws a low power and therefore comes with a relay. #7Jul 15, 2019. Open the hood and feel the air coming from the fan. fans, via pin #8. Then stop leave engine running and the fan should start. When the coolant reaches a predetermined degree. Then 3 bolts attach the fan to the clutch. May 25, 2009 I have a Mercedes SLK(NNN) NNN-NNNNmodel. You can display the status of the aux fan control using the link starting from step 2. Dead Wires. During normal use of the veh. Now I noticed the fan between the engine and the radiator moves slowly. Sep 8, 2018 Check out the video to help you troubleshoot your Mercedes W208 CLK 320, CLK 430 and CLK 55 AMG May 26, 2021 Step two. This is part 1 of a t. Running a car hot for a long period of time can lead to other damages like a blown head gasket. 8. Severe-Duty Thermal Fan Clutch: Severe duty thermal fans turn . The lamp is for low level in the tank. So, with the engine running and the coolant temperature switch unplugged, the fan should come on. If the multimeter reads 0 Ω, ∞ Ω, or OL Ω, the motor will need to be replaced. May 1, 2023 Figure 1 Standard 4-pin relays use pins 85 and 86 (parallel to each other, indicated by arrows) for low current and pins 30 and 87 for the coil-enhanced high current. When the engine temperature rises higher than normal, inspect the cooling fan. When the cooling fan fails, your engine overheats. Take a look at the electrical connections and ensure they are all tight. It also offers a method to test whether the fan is good or not before installing it in the car. Through research through this forum along with others . Oct 18, 2010 On my car this was caused by a faulty engine fan control module. Initiation is from the coolant temp sensor (B11/4) but fan speed variation is managed within M4/7. I am not getting any error messages but the fan does not come on. There will be multiple contacts on each fuse. Sensor and the ECM monitor coolant temp. Without it, the cooling fan won’t work. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154. 99 .