Radiator Fan High Speed Not WorkingSolution to radiator fan continuing to run when engine is off">Solution to radiator fan continuing to run when engine is off. What I've done in a pinch is put a jumper on the low speed fan relay to force the fan on. 6 VVT cooling fan problems. Fans are controlled by sensors and ecu so that the engine temperature is kept within a specific range. Do you have a Dodge Caravan, Chrysler Town and Country or Plymouth Voyager van and are experiencing an overheating condition while in traffic or at stops but then the engine temperature drops when. Does the AC have to be working in order for the fan control module to send high speed fan signal? Bentley manual didn't mention the AC when describing the tests to perform. The strange part was that when the problem happened the coolant temp gauge on the dash would drop to dead cold. My high speed on my blower not working new resistor motor. •When A/C is requested and the ambient temperature is more than 10°C (50°F). The BCM will request low speed cooling fan operation from the PCM under the following conditions: •Engine coolant temperature exceeds approximately 103°C (217°F). It would create a faulty coolant temp code and as soon as I cleared. See more Reply Save Like P PH112 Discussion Starter · #7 · Feb 26, 2003 95GTfiveOh,. John Clark said: So, to make a long story short, if you have a 2007-2009 Factory Service Manual I suggest adding the box Honda left out of the Symptom Troubleshooting Index on page 21-14: Symptom. If the motor fails, it won’t power the fan blades to spin. I think what happens is the fan becomes defective, draws too much current, and opens a fuse in that resistor block. Which is why when your not moving, or not moving much, you'll see the temp. Fan relay - working fine 3. Those fans will not switch to high speed until the coolant reaches 226 degrees. Cooling Fan Does Not Work: the High Fan Doesn't Work. If it's not, or if your car is overheating, try these solutions: Replace Radiator Fan Relay - A bad cooling fan relay (view on Amazon) can definitely stop your fan from working. Show more Show more What to do if your A/C fan is not working Oz Mechanics 29K views 1 year ago. Reply Save Like 1 E Emin-j Discussion Starter · #7 · Aug 16, 2017 JohnnyC said:. I have posted here before about an intermittent problem with the radiator fan staying on after the engine is shut off. Tdijarhead Top Post Dawg Joined. Still in Output Test Mode, with fan commanded off. Images (Click to enlarge) SPONSORED LINKS Was this. Make sure you're working with the proper relays. Both fans run on low, the condenser fan runs on high, but the radiator fan does not run at high speed. There is a high speed relay the TIPM controls it. Whenever i start driving ,after 4-5 kms the fans starts with its maximum speed. Replaced the control module (attached to the radiator) 4. I ">Cooling Fan Does Not Work: the High Fan Doesn't Work. Fan motors- work fine (connected them directly to power source) 3. Under automatic control (no jumper) often it's fine and doesn't overheat. Those fans will not switch to high speed until the coolant reaches 226 degrees. It's located in the upper right corner as you're bent over the radiator. How to Troubleshoot Fan Issues. Identify where the radiator fan relay is located. Radiator Fan Not Working Symptoms Overheating is the only symptom that you will instantly notice. 2009 GMC ACADIA. So, the fan is not the issue. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. Yes, the same fan that cools your radiator, also cools your A/C condenser, which keeps head pressure down in the compressor. When the cooling fan fails to turn on both when the AC is on and off, the fan itself can be the culprit. GM 3 Relay Low/High Cooling Fan Explanation/Diagnosis/Testing. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly. If both power and ground check fine, then you probably have a dead fan. 6 VVT cooling fan problems. For that you need a scan tool that can read live data (most of the mid range ones will do that now). So, it's usually around 40-60 degrees everyday. The cooling fans have an electric motor inside that powers them to spin. The HIGH speed circuit bypasses the actual resistor, sending the full 12v to the fan for high speed. High Speed Fan Works, Low Speed Doesn't. Cooling Fan Relay Location?. I replaced the thermostat, but this did not resolve the issue. To test this, if it starts to get hot at idle, set the defrost to max. on the driver's door) commanding the adjustment of the driving wheel. Mechanic said the overheating problem is either the radiator or the water pump. Check fuse 4 (40a) in the PDC with a meter. Matching contact pins can often be found in kits on Amazon. 5) If the fans run as described in Steps 3 and 4, it indicates that the cooling fans and circuit are operating properly and the thermo switch is faulty. My engine is Overheating if vehicle is at stop because High Engine Fan is not Working. The ceramic resistor has three terminals (high/low/ground) on the input side and two wires (positive/ground) on the fan side. •A/C refrigerant pressure exceeds 1310 kPa (190 psi). I believe i set the cooling circuit codes by unpluging things. It basically said that the fan control module (or a bad wire) is the culprit if you can't get power to the fans when jumpering the proper wires. I have a 2014 Durango Limited with a V6 and 180,000 miles. Cooling Fan Does Not Work: the High Fan Doesn't Work. The same time, Aircon compresdor is not working/shutting down due to high pressure. In the off state, the blower motor is effectively disconnected from the power supply. To determine if there is an actual problem you need to know what the ECM is actually seeing as the coolant temperature. Symptom found: High and low pressures are too high After a bit of looking through the manual one of the causes for pressure readings like this is reduced airflow through the condenser. Cleaning the air vents on your Dell computer Turn off the computer. Some fan problems must be repaired right away to protect your engine. JK 2012+ Cooling fan high speed relay. It may cause the fan to cut in and out, or not come on at all. If the cooling fan resistor fails or has any issues, it can cause power to be cut off from the cooling fans, which can lead to overheating. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. The most common causes of why a radiator fan is not working are a blown fuse, a bad relay, or a broken wire. I jumpered the power (red wire) to the low speed terminal (red/white) and got low speed fan operation. when we turn on the car the fan still doesn't run so we don't let it run for fear. It's not outside temp, it's the temp of the coolant. patrickw wrote: P0691 Stored Cooling fan 1 control circuit low. How To Check If Radiator Fan Is Working 1. I suggest that you get your cooling system checked out, before it causes more damage. Dodge Caravan Radiator Fan Not Working. Relays may be tested in any normal fashion you are familiar with. dealership to re-program the fan. They are either on and turning full speed or off and not turning at all (under their own power. Not so in the JK. rise before the high speed kicks in. Or, one of the fan motors went to poop. Niether fan speed will work if the sensor is just plain out bad. You would have to run a wire from the black wire side to a good ground to test it but the radiator would have to be up to a high enough temp to have the fan come on. The PCM commands the low speed fans ON under the following conditions: • The engine coolant temperature exceeds approximately 106°C (223°F). 20K views 1 year ago This 07 Classic Silverado had signifcant corrosion on the cooling fan relays and auxiliary relay center. IMPORTANT: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. If not running then check fan connector to see if you have power to fan and ground to fan. Or, one of the fan motors went to poop. Simple test as Oilhammer explained (engine not running) 1. Symptom found: High and low pressures are too high After a bit of looking through the manual one of the causes for pressure readings like this is reduced airflow through the condenser. Here are the most common reasons that your radiator fan does not turn on: Before poking your hands around your fan, make sure to treat it like it still could come on, and and keep your hands out of its path. I have checked both the low speed radiator fan relay and the high speeed radiator fan relay by applying 12V and. 5 Symptoms Of A Bad Radiator Fan And Replacement Cost. The high speed fan will kick on after a certain point though because the sensor will start to get extremely hot, and get the hint that the fan needs to be turned on. I Have replaced the choked radiator as mechanic said the water circulation is not proper and engine is getting heated. The cooling fan is not coming on consistently. rise before the high speed kicks in. During low speed mode: The PCM grounds the (N201) Fan Relay Control circuit, closing the relay to connect the (A16) Cooling Fan 12 Volt Supply circuit to the (N23) Cooling Fan Motor 1 Output circuit. Checked the fan motor with 12v, it ran high speed. check relay 18if it works then check the fan resistor. 6 - Fan Control Relay (this is a 5 pin relay instead of a 4 pin relay) 13 - Condenser fan relay. Broken radiator fan. Each plug has three connections. Cooling fans not coming on. It is more likely not getting power. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. The high speed fan will kick on after a certain point though because the sensor will start to get extremely hot, and get the hint that the fan needs to be turned on. The fan will run continuously and you could drive home like that. The radiator fan runs at high speed, even in the winter with the AC off, and is very loud when it is on. There is a high speed relay the TIPM controls it. I suspect that when the low speed is enough everything is fine. To determine if there is an actual problem you need to know what the ECM is actually seeing as the coolant temperature. Both relays appear to be in working order. Radiator Fans only seem to operate on LOW and not HIGH speed. The high speed fan relay is triggered by the PCM (Power Control Module) computer programming. If your radiator fan is not working but not overheating, chances are you have no coolant inside the reservoir. Do not attempt to open the power supply to clean the fans. Turn Fan on dash ON 3. We wound up replacing the radiator but when we turn on the car the fan still doesn't run so we don't let it run for fear of damaging something further. Add to quote; Share Only show this user. Overheating ( High Engine Fan not Working). The result is a parallel circuit with both fans running at high speed. You could then remove the fan high speed relay. Already replaced fan control module, checked fuses. If it is open then that is your problem otherwise you might have an issue with the TIPM circuit board. The cooling fan is not coming on consistently. Radiator Fan High Speed not working, I have tried this. One is ground and the other two are high and low. Under automatic control (no jumper) often it's fine and doesn't overheat. The relay isn't the only possible cause, nor is it the most common cause. The fan itself works (both low and high speed when twelve volts is applied directly). Some fan problems must be repaired right away to protect your engine. The result is a parallel circuit with both fans running at high speed. The faulty coolant temp sensor might also be a. Here is a cooling fan wiring diagrams so you can see how the system works plus instructions on how to replace the TIPM below. T-watts said: My 2003 jetta TDI radiator fans are not working under normal operation so I checked the fan switch. If the problem of the radiator fan not working still persists, you can check the fan by connecting a different power source to it, that is direct battery power. If the sensor is no good, the sensor won't signal anything to the computer, and you will start to overheat. It means the fan is not receiving. Radiator Fan Not Working Symptoms Overheating is the only symptom that you will instantly notice. Mercedes cooling fan problem. Cleaning the air vents on your Dell computer Turn off the computer. I replaced the radiator since it burst after overhating, I had replaced both fan relays, I replaced the fan's 40A fuse. I had replaced the coolant sensor When I. When the engine suction fan runs at high speed like that, it means it is not communicating with the ECU. The TIPM replacement is easy because. Checked the connectors/cables and un-plugged and re-plugged them back in again with no result. The cooling fan does not work…. check relay 18if it works then check the fan resistor. Whenever i start driving ,after 4-5 kms the fans starts with its maximum speed. I have a 2003 Buick Lasabere Limited. Now, do the fans out front run [in your case,. Those fans will not switch to high speed until the coolant reaches 226 degrees. Both fans should run at high speed. You need to stop the car if you notice that it starts to overheat. Attached is the wiring diagram showing fan operation for a single fan setup. Which uses input info from the antifreeze temp sensor, trany oil temp sensor, A/C pressures & temp to turn it on. In this video I have a look at a Honda 3 relay cooling fan system. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly. Replied by jreardon on topic 2012 Dodge Caravan 3. A simple way to check if the radiator fan is working is to start your engine and turn the air-conditioning system (A/C) to the maximum speed. It is more likely not getting power. Which is why when your not moving, or not moving much, you'll see the temp. The electrician is himself puzzled as he claims that he did not tamper with any wire. (this is the same basic system Toyota has used since the 80's, so I'm well versed in how it generally works). One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. It is a very common way to use two fans with no resistor all while having a high and a low. My engine is Overheating if vehicle is at stop because High Engine Fan is not Working. Lint and dust accumulation prevents air from flowing around the cooling fins and causes the fan to work harder. On hot days (temps in 90's plus), my Jeep would overheat while driving regardless of speed. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged. My cooling fans are not working in high speed but working in low speed, when I remove the engine temperature sensor they got work in high speed it means that relays, fuses and fans are good, then what do you suggest to do here? The radiator get so much hot and the A/C also comes to hot. See more Reply Save Like Mötley Jeep · #11 · May 10, 2022 jkgeek said:. The most common reasons for a radiator fan not working can be a blown-out fuse, a bad relay, or a broken wire. Your Dell computer may contain several fans to keep the internal components cool: Desktop computers have more than one fan - processor (CPU), dedicated or discreet video card (GPU), power supply (PSU), and one or more chassis (case) fans. Vehicles either have a module controlling fan speeds or those with 2 fans often use 2 or 3 relays working together so that the fans can run in series (low speed, splitting the voltage and running slower) in parallel (both fans receiving full system voltage at the same time), or again, just one of the two fans might be energized sometimes. Cooling fan will not operate at any speed. Likely cause found: I could hear the fans running so it wasn't obvious at first. I have posted here before about an intermittent problem with the radiator fan staying on after the engine is shut off. Low speed high load is usually when the fans will come on. Car cooling fan problems and how to check it. Issues like the fans not turning properly, faulty sensors can cause overheating but so can many engine faults. Jeep JK radiator fan high speed issues fixed and. I think the high speed circuit is not working. This is a very common problem with the Mercedes radiator cooling fan running constantly on high speed. I recently had to replace the ECM for other reasons. During high speed fan operation, both engine cooling fans have there own ground path. Check for any damage and clean the connector. When the electric motor surges, the fuses blow to ensure the system stays safe from this extra power. Any damaged, broken, or disconnected wiring can keep your radiator fan from working when it needs to, threatening the health of your engine should it overheat. I can drive it all day like that. There is a high speed relay the TIPM controls it. Radiator Fan Runs at High Speed. 5 Symptoms Of A Bad Radiator Fan and Replacement Cost. You can turn your engine on, open your hood and see if the fan is turning at full speed. A simple way to check if the radiator fan is working is to start your. then jumper the sockets 87 and 30. Coat them with dielectric grease. If The Fan Control Relay wasn't working, one fan would turn off and the other would turn on high (opposite fans from above) Basically, the system is fairly redundant and you need to have two failures to lose all your fans. If your low speed fan resistor is fine, then turning on the AC will turn on the low speed fan continuously AFAIK. So, that would mean that the electrical resistor internal that "consumes" current to provide slow speed is burned out!. 4K 112K views 3 years ago In this video I have a look at a Honda 3 relay cooling fan system. GM 3 Relay Low/High Cooling Fan Explanation/Diagnosis/Testing - Chevy Venture - YouTube I have had a lot of people ask me about GM Radiator cooling fan diagnosis in the past. If your low speed fan resistor is blown, then turning on the AC will cycle the high speed fan on & off. How To Check If Radiator Fan Is Working 1. In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor. Push in the AC button (light should come on) 4. If there is another relay of identical specifications and rating, you. com/carsntoys Tools and Supplies: https://www. The problem could even be in the way the A/C switch controls fan ON/OFF switching. That would put me in the 40 - 70 degree range which would read 7500 - 3400 ohms. The other option: the termostat went to poop. Which is why when your not moving, or not moving much, you'll see the temp. Low speed high load is usually when the fans will come on. Ensure that the wires are firmly attached and are not damaged. And he said we'd need a dealership to re-program the fan. That document would be very helpful. When the electric motor surges, the fuses blow to. Both engine cooling fans should run at high speed. Those can certainly be set when the relay is removed but make sure and start. I suggest that you get your cooling system checked out, before it causes more damage. Does the AC have to be working in order for the fan control module to send high speed fan signal? Bentley manual didn't mention the AC when describing the tests to perform. My radiator fan will not switch into "high speed" mode At the end of summer there were a few hot days where I checked the temperature after driving home from work and I found it at 101 degrees Celsius more than twice, I switched on the air-conditioning (I don't use the A/C much while driving myself) and the fan will not kick into high speed. Radiator Fan Not Working When AC Is On: Causes and Fixes">Radiator Fan Not Working When AC Is On: Causes and Fixes. 1- The radiator fan was roaring - It was operating at full speed and blowing air out, across the bumper. If only one radiator fan is working, check the other one. During high speed fans operation, both fans run at high speed. Fans only seem to operate on LOW and not HIGH speed anymore. Air conditioning not working correctly. First, unplug the wiring connector. Check the air vents on the computer for dust or debris. Fans are controlled by sensors and ecu so that the engine temperature is kept within a specific. During high speed mode, the cooling fan motor and resistor operate in parallel to one another, with each receiving a separate 12 Volt source. The PCM commands the low speed fans ON under the following conditions: • The engine coolant temperature exceeds approximately 106°C (223°F). I managed to find a used parts which required splicing 8 wires. Even after replacing the radiator the problem persists ,now he says there is a problem with gas kit and needs to be repaired. The electrician is himself puzzled as he claims that he did not tamper with any wire. 1- The radiator fan was roaring - It was operating at full speed and blowing air out, across the bumper. If the pins on your fan-module harness are damaged, check to see whether it can be disassembled. High speed does not work when A/C is turned on. If not running then check fan connector to see if you have power to fan and ground to fan. Particularly if you're running the A/C. What you might do is pull the resistor block off the fan and measure it. The high speed fan is very noticeable by the noise generated. GM 3 Relay Low/High Cooling Fan Explanation/Diagnosis/Testing - Chevy Venture - YouTube I have had a lot of people ask me about GM Radiator cooling fan. Another reason the fan will stop working is if it blows a fuse. Ensure to turn off the computer and disconnect the power cables and use a compressed air can to clean. Even waterpumps can be faulty and reduce the coolant flow. While these are some of the reasons, the list is not exhaustive. Here is a cooling fan wiring diagrams so you can see how the system works plus instructions on how to replace the TIPM below. Facts: Common Reasons Why Your Radiator Fan is Not Working The radiator and cooling system are vital in keeping your vehicle from overheating, and a malfunctioning radiator fan A radiator fan is necessary when the vehicle is at low speeds because wind doesn't push through the radiator, and it. During high speed fan operation, both engine cooling fans have there own ground path. This is a clear sign that your fan is not working, or something else is wrong with your cooling system. To be clear on the relays I've posted a diagram. While these are some of the reasons,. Your going to need to check for power at the fan, the fan can still be failed and spin just fine by hand, considering you dont have high or low I would lean towards a. Solution: Your mechanic can troubleshoot your radiator fan's wiring system, look for any wiring faults, and repair them as needed. Perform the A Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans. Niether fan speed will work if the sensor is just plain out bad. With the car’s power off, find the relay and remove it. Make sure the seals around the harness are proper. When the cooling fan fails to turn on both when the AC is on and off, the fan itself can be the culprit. During high speed fan operation, both engine cooling fans have there own ground path. Can anyone confirm my assertion there?. The fan relay controls the power to the cooling fan. com">Bad Cooling Fan Relay Symptoms. Radiator Fan works intermittently. The high speed fan is very noticeable by the noise generated. Check out the diagrams (below). If your radiator fan is not working but not overheating, chances are you have no coolant inside the reservoir. The cooling fans have an electric motor inside that powers them to spin. The TIPM replacement is easy because it self initializes. If you notice that your engine is running at higher temperatures than normal,. Another reason the fan will stop working is if it blows a fuse. I had replaced the coolant sensor When I disconected the coolant sensor harness, the fan spun in high speed and the check engine light came on. The high speed fan will kick on after a certain point though because the sensor will start to get extremely hot, and get the hint that the fan needs to be turned on. GM 3 Relay Low/High Cooling Fan Explanation. I replaced the radiator since it burst after overhating, I had replaced both fan relays, I replaced the fan's 40A fuse. Lint and dust accumulation prevents air from flowing around the cooling fins and causes the fan to work harder. Fans only seem to operate on LOW and not HIGH speed anymore. One of the first symptoms of a potential problem with the cooling fan resistor is engine overheating. Make sure the seals at the rear of the harness are proper. jhs914 said: I have posted here before about an intermittent problem with the radiator fan staying on after the engine is shut off. Maintenance, Warranty Issues & Troubleshooting: 16: Jun 7, 2019: Radiator fan not working: Maintenance, Warranty Issues & Troubleshooting: 10: Feb 4, 2018: Radiator/Fan recommendations? General Automotive Discussions. Yes, the same fan that cools your radiator, also cools your A/C condenser, which keeps head pressure down in the compressor. Checked the temperature switch with ohm meter - seems to be fine, resistance changes with temperature changes. Do not attempt to open the power supply to clean the fans. If there’s an issue with the relay, the fan will be affected. The most common causes of why a radiator fan is not working are a blown fuse, a bad relay, or a broken wire. Radiator Fan Not Working? 7 Common Causes & How To Fix It. Before doing any work on the Nitro, disconnect the Neg (-) battery cable and wait 10 minutes!. Old setup: More power waiting to go to the track! P PH112 Registered Joined May 21, 2001 214 Posts. The fan should kick in and lower you temps. If using an electric fan, the problem is often due to a blow fuse, bad relay, broken wires or connectors, and burnt out motor. You would have to run a wire from the black wire side to a good ground to test it but the radiator would have to be up to a high enough temp to have the fan come on. Broken radiator fan. If your cooling fan runs continuously, check the fan relay or cooling fan temperature switch, or engine coolant temperature (ECT) sensor. In the off state, the blower motor is effectively disconnected from the power supply. Radiator Fan: My Radiator Fan Has Two Speeds. If the problem of the radiator fan not working still persists, you can check the fan by connecting a different power source to it, that is direct battery power. In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor. I'll be working on the car when it's the temp outside, so the engine will be about the temp is outside. problem is either the radiator or the water pump. Cooling Fan Not Working, Coolant 260F. The fan should kick in and lower you temps. In this video I have a look at a Honda 3 relay cooling fan system. Some fan problems must be repaired right away to protect your engine. Air/water can enter from there as well. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. The cooling fans that bolt to the back of the radiator and pull air through it are NOT variable speed. My radiator fan has two speeds. Turning the AC on while stopped will usually turn on the low speed fan and unplugging the 3 wire AC pressure sensor on the small line coming from the compressor will turn on the high speed fan. com/carsntoys Tools and Supplies: https://www. the fan motor with 12v, it ran high speed. Another reason the fan will stop working is if it blows a fuse. 15 - Radiator fan relay. I replaced the radiator since it burst after overhating, I had replaced both fan relays, I replaced the fan's 40A fuse. Radiator fan won't go into high speed. Testing low and high speed cooling fan relays. It would stop only when the ignition is switched off; 2- When I turned the A/C on, nothing was coming through the outlets, that is neither air nor coolness. If it’s not, or if your car is overheating, try these solutions: Replace Radiator Fan Relay – A bad cooling fan relay (view on Amazon) can definitely stop your fan from working. Low speed works normally. Car Radiator Fan Not Working: Troubleshooting 6 Common …. No the AC will turn the radiator fan on to pull air across the condensor. That's the old school way, the new way might be that the fan is controlled by a pwm signal from the computer. Fans only seem to operate on LOW and not HIGH speed anymore. Look for the link on the forum to download a Lambda-platform service manual (2007-2016 will do). Yes, the same fan that cools your radiator, also cools your A/C condenser, which keeps head pressure down in the compressor. Those fans will not switch to high speed until the coolant reaches 226 degrees. High speed is not working. One of the first symptoms of a potential problem with the cooling fan resistor is engine overheating. Wiring The first thing that you would want to do is locate the fuse for your 300’s radiator fan and make sure that it hasn’t blown. GM 3 Relay Low/High Cooling Fan Explanation/Diagnosis/Testing - Chevy Venture - YouTube I have had a lot of people ask me about GM Radiator cooling fan diagnosis in the past. Ensure that the wires are firmly attached and are not damaged. The most common causes of why a radiator fan is not working are a blown fuse, a bad relay, or a broken wire. Higher speeds didn't help cool it off. Please let us know what happens. You can change the fuse, but a defective fan will probably cause another one to go out. My cooling fans are not working in high speed but working in low speed, when I remove the engine temperature sensor they got work in high speed it means that relays, fuses and fans are good, then what do you suggest to do here? The radiator get so much hot and the A/C also comes to hot. Before going into the necessary. Radiator Fans only seem to operate on LOW and not HIGH speed">Radiator Fans only seem to operate on LOW and not HIGH speed. Help! Radiator fans not working and AC. Radiator fan, high speed only. X241 COOLING FAN WILL NOT OPERATE AT ANY SPEED: COMMAND FAN ON (HIGH SPEED FOR TWO SPEED APPLICATIONS) AND CHECK FOR VOLTAGE AT FAN. The high speed fan relay is triggered by the PCM (Power Control Module) computer programming. The problem in most cases is a bad ecm so in order to fix it the ecm. You can also check for continuity across the breaker to test it. Radiator Fan Problems, How to Test Radiator Fan. We wound up replacing the radiator but. If The Fan Control Relay wasn't working, one fan would turn off and the other would turn on high (opposite fans from above) Basically, the system is fairly redundant and you need to have two failures to lose all your fans. The cooling fan system is rather complex. The HIGH speed circuit bypasses the actual resistor, sending the full 12v to the fan for high speed. Cooling fan high speed relay. P0693 Stored cooling fan 2 control circuit low. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged. If the cooling fan resistor fails or has any issues, it can cause power to be cut off from the cooling fans, which can lead to overheating. Radiator fans will burn out a fuse because it is failing and creating too much amperage. You can turn your engine on, open your hood and see if the fan is turning at full speed. Those fans will not switch to high speed until the coolant reaches 226 degrees. Ensure to turn off the computer and disconnect the power cables and use a compressed air can to clean any dust or debris. Some troubleshooting that was done: Inspection and replacement of the 30amp purple fuses. Do you have a Dodge Caravan, Chrysler Town and Country or Plymouth Voyager van and are experiencing an overheating condition while in traffic or at stops but then the engine temperature drops when. Then when the ECM calls for fan to run at high speed then it gets no fan and overheats. Without the jumper I hear the fan come on some times. Testing low and high speed cooling fan relays. The radiator fan is still operating at full speed and will stop only when the ignition is switched off. Radiator fan won't kick into high speed ! Oceana-Asia Fiesta ST Owners: 0: Jul 1, 2019: Radiator fan high speed mode not working. Testing low and high speed cooling fan relays. 6) If the fans do not operate with the thermo switch bypassed check for voltage at the red wire of the thermo switch electrical connector. It's located in the upper right corner as you're bent over the radiator. This is because the temperature sensors in cars do not read how hot the engine is. If the fans do not operate with the thermo switch bypassed, check for voltage at the red wire of the thermo switch electrical connector. Instead, it tells the engine temperature by calculating the hotness of the engine coolant. Radiator Fan Not Working When AC Is On: Causes and Fixes. If the fans work on high the brushes are okay. I jumpered to the red/yellow wire and could not get high speed to turn on. 1- The radiator fan was roaring - It was operating at full speed and blowing air out, across the bumper. You will see how the temperature gauge starts to climb into the red zone. If your vehicle has two fans and one of the two fans isn't working, the problem could be the bad fan or a faulty relay. To determine if there is an actual problem you need to know what the ECM is actually seeing as the coolant temperature. The most common causes of why a radiator fan is not working are a blown fuse, a bad relay, or a broken wire. In older vehicles that had questionable cooling fans, you could just drive 50-60 and the airflow through radiator was enough to keep your engine happy. If the radiator fan isn't working, a failed relay is one of the possible causes. The online chilton manual has the diagnostic steps to help you further. You can unplug each fan and test to see if brushes or the low speed is the culprit. I think what happens is the fan becomes defective, draws too much current, and opens a fuse in that resistor block. You're reading the chart wrong. If the fan is spinning, then it means that the fan motor, fuse, wiring, and relay are all working properly.