Second, start the engine and start idling your vehicle. No A/C 7 Answers. Disconnect the Engine Coolant Temperature Sensor (ECT). As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem. If you need to confirm if it’s in working order or not, you should turn on your engine and let your vehicle idle. There is a fault code set in the engine computer that will cause it to operate in a failure mode in that it turns the fan on to be sure the engine will be cooled. To Test: 1. A temperature-sensitive switch functions to turn the fan on and off periodically. The mechanic has told me that it only turns on when the ac reaches a certain pressure. The radiator fan is positioned between the radiator and the engine and is in charge of cooling the car and keeping the occupants at a comfortable temperature level. It should test for continuity when engine cold. Recommended Posts. For this test, the only tool that you need is a test light to see why your radiator turns on when you start your car. It is longer at colder temperature (outside/engine). Every time I go to start the car after it has been sitting for an entire day and the engine is cold, when I turn the key to the “On” position, before the engine is even started, the cooling fan comes on. When they are on both the radiator and condenser fans come on. After noticing during the radiator fan inspection that something is wrong with your radiator fan or fan clutch, you now know you need to get a replacement. Mine occasionally does the same thing. Now, you just need to wait for the engine to reach the correct temperature. Ok. , is an improvement over engine-driven fans that slow down a usually when they are needed the most. Below 200 degrees, the fan turns off, above it, the fan turns on. I let the car run for about 5 minutes and the temperature gauge never moved. The fan coming on means there is a break in that circuit somewhere or the switch itself is bad. Leave the A/C off for the rest of the test. The cooling fan comes on when I start the car and stays on for 5 minutes after I turn it off. Car has about 75k-80k miles, and recently the fan started staying on after I turn the car off ( no matter how long the trip or the temp outside). My car has been over heating when my AC is off.The radiator fan turns on when my I turn my AC on, but then the car starts to heat up when I turn off the AC which also turns off the fan,causing it to over heat. If the fan doesn’t come on, you need to look for a broken fuse or breaker. These cooling radiator fans are very imperative to when your car is running slowly or sitting still, as external airflow will not be able to move through the grille and cool-off the passengers. Also, the fan will do this even after short 5-10 minute trips. As soon as I turn the ignition key both radiator fan start to spin even though the car is cold and not on. Anyways, the radiator fan turns on, and stays on, whenever my heater is switched on. A forum community dedicated to BMW owners and enthusiasts. The difference between these two kinds of fans can affect why the radiator fan turns on when the car starts. 3. Hi, my engine is overheating, because my cooling fan turns on too late. They run from the time i turn the truck on to the time I shut it off. 2. 3. If you prefer to do some of the work yourself to save some money, you can actually troubleshoot a cooling fan to see where the problem lies and how to fix it. I have read that is should turn on when the ac is turned on I would like to be reassured of this. I also want to know if the auxiliary fan is supposed to turn on when the ac is turned on???? The radiator fan is in charge of pulling cool air through the car’s radiator, helping cool off the passengers and keep your ride as comfortable as possible. If your cooling fan circuit fuse has blown. Discussion Starter • #1 • Nov 4, 2014. The difference between these two kinds of fans can affect why the. It sends signals to the radiator fan to turn on when the temperature crosses 172°F. This type of radiator fan is almost always found in modern vehicles and sedans. The cooling fan relay is the relay that controls the engine’s cooling fans. As the radiator fan is electrical, the problem could be with the fuse. JavaScript is disabled. I was told that it was a faulty temperature sensor which I … When the temperature exceeds a specific value -- usually 215 degrees Fahrenheit -- the computer will turn the fan on. So when the cooling system starts to malfunction then will lead to car overheating when air conditioner is on. 4. The ECT needs to be viewed on a scan tool as well as some other DME parameters when engine is started cold. If your motors fail or surge unexpectedly, then this can cause the fuse to blow. There are typically a few locations where the problem is originating from, such as the fan motor, thermal switch, wire, or relay. 10 Smart Tips! If you have problems with the radiator fan, you need to take care of them immediately or you could cause serious damage to your car. Most of these radiator fans have a built-in clutch, allowing the fan to idle when the engine is cold, saving some energy and power for an efficient mechanism. That depends on the car. As best I remember the idle does jump up when the A/C is on, but it does it the same way as when the radiator fan kicks-on: the idle drops low first (sometimes almost stalling for a moment) and then comes up to a bit higher than an idle without the A/C or radiator fan being on. If the light doesn’t come on, you figured out that the switch is not working. Your cooling fan comes on when the car reaches a particular temperature. I believe it would be the radiator fan, since I usually hear the same fan noise when my car starts to overheat. 1; 2; Next. The coolant fan will continue to run until the … In order for the AC Condensor to do its job it must stay as cool as it can. How to Stop a Cooling Fan That Randomly Turns On/Off (Audi A4) ... As I got closer to my car, I could hear the auxiliary fan spinning at full speed! The answer is simple; there is something wrong with the fan or the cooling system. The trigger is the thermostat in the radiator of your vehicle. 1996 - 2004 SN95 Mustang -General/Talk- SN95 4.6L Mustang Tech. Temperature Sensor . Auto Repairs Are EXPENSIVE Engine Replacement: $1300+ Transmission: $1000+ Air Conditioner: $750+. The radiator fan is a crucial part of your car that is in charge of cooling the car and keeping the occupants at a normal temperature level. Discussion Starter • #1 • Sep 18, 2012. I am clueless where to go next. This is not after a … In addition, there are other obvious signs of a bad or failing fan motor. Your car fan will run for a few minutes after you turn off the car then turn … The engine’s computer is in charge of when the fan turns on and off, dictating the radiator fan’s usage based on the temperature of the vehicle. This issue doesn't happen if engine is warm. When I turn my car off, the fan stays on for a few minutes before turning off. The trigger is the thermostat in the radiator of your vehicle. turns on and off as needed based on the internal vehicle temperature. Please help me with your expert opinion. If you prefer to do some of the work yourself to save some money, you can actually. Why does your Mini Cooper Fan stay on when I turn off the engine? In order to figure out the reasons why your radiator fan turns on when the car starts, you need to know how it works, the function of the radiator fan, and the signs of a failing radiator fan. I make sure to keep an eye on the temp gauge, and it never gets abnormally hot. I have a 2007 Mazda6 with the 3.0L V6 that I have owned since new. Hi, I have a 2007 GTI. The fan should also turn on after switching on the air conditioner. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. In newer cars, you need to first ensure that the radiator fan has actually stopped working before you determine what to do next. Within your car, there are vital components that directly relate to your car’s smooth running and operation. I also wanted to hear if it would happen again so I listened very closely for it. Also, the fan will do this even after short 5-10 minute trips. The radiator fan is positioned between the radiator and the engine and is. Again, the HVAC is off. Ensure that the wires are firmly attached and are not damaged. Then you notice the engine cooling fan is still running even though the car is turned off. My car has 180502 miles. Checked the voltage on the coolant sensor harness with ignition switch on, there is no 5v or the green pin is not grounded. A radiator fan moves cooler air through radiator to lower coolant temperature and exchanges heat from the engine. If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat. My car has been over heating when my AC is off.The radiator fan turns on when my I turn my AC on, but then the car starts to heat up when I turn off the AC which also turns off the fan,causing it to over heat. If there’s a. then this can damage the radiator. Then you notice the engine cooling fan is still running even though the car is turned off. Small cars typically have stacked AC and engine radiators cooled by a single fan. Knowing this key information can help you keep your radiator fan running efficiently for as long as possible. I checked all the relays and fuses. Reply to this topic; Start new topic; Prev; 1; 2; Next; Page 1 of 2 . The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. That’s why it’s best to take your car to a garage. The built-in clutch will also be smart enough to rotate when it is hot in the car, being able to detect the temperature and when to operate. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Sure enough, about 45 min later the fan came back on and required the ignition to be switched on to turn it off. Time Frame. The cooling fan should come on immediately or within the next couple of minutes. I'll check and clean connections. For a better experience, please enable JavaScript in your browser before proceeding. Yes, the fan will come on when you turn the A/C on, so that proves the fan works. In other cases, the switch will turn on and stay on well past the cooling temperature threshold, resulting in the fan running even when the engine is off. Back probe the connector terminals with the test light – hopefully, one of the connector terminals is able to turn on the test light and show that it is working properly. The cooling fans are designed to turn on once a certain temperature has been reached inside of your vehicle, or certain conditions have been met. If your fan has still failed to turn on when the car starts, you can check the fan by connecting a power source to it. Otherwise it will remain a raise hood throw on some parts repair attempt. As we mentioned before, the cooling system is a complex set of parts that helps to regulate the internal temperature of the engine to avoid overheating. 46 Posts . Below 200 degrees, the fan turns off, above it, the fan turns on. After noticing during the radiator fan inspection that something is wrong with your radiator fan or fan clutch, you now know you need to get a replacement. No solution yet. One part of the car that is imperative to a smooth and safe ride is the radiator fan. There are a number of common problems with radiator fans, and if your vehicle has one of them, fixing it is relatively quick and cheap to administer. If your coolant level is low there is a chance that you will get air in the system … However, if you are able to notice the telltale signs and symptoms of a bad or failing radiator fan motor, you might be able to stop the problem before it gets worse. If your cooling fan circuit fuse has blown, this is another sign of a problem with the radiator fan motors. Without these parts working at the optimal level, your vehicle will not be able to function and perform the way it is supposed to. If your car is running at a sub-par level, then there is a greater chance that other components can be negatively affected and lead to more repairs and replacements. If your motors fail or surge unexpectedly, then this can cause the fuse to blow. It is what sends the signal for the fan. Cadillac Transmission Repair Cost – Avoid The 2016 Cadillac ATS! First, you need to unplug the wiring connector. The second symptom of a damaged radiator fan motor is that your car is currently overheating. and keeping the occupants at a comfortable temperature level. This is a key reason why the radiator fan turns on when the car starts. Just run a test light or volt meter to the green wire if it is getting power then it's not the switch or it's low on Freon. Amateur Diagnosis. When I turn my car off, the fan stays on for a few minutes before turning off. This cycles on and off for about a few minutes. Start your vehicle, and let it idle for 10-15 minutes. is that your car is currently overheating. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. Since the radiator fan motors are so important, you need to bring your car to a professional technician to diagnose and repair your parts to keep your vehicle safe and working conditions. ******************************************************************************************************. What could be the problem? Wait until it stalls and won't start, and then simply umplug the connector to the radiator fan, and see if this "cures" the problem. As soon as I turn off my heater, the fan turns off. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars. This (extraordinarily hot) summer I noticed for the first time that the radiator fan runs for 5-10 seconds after I turn the car off, even with the keys out of the ignition. If there’s a problem with the engine’s temperature, then this can damage the radiator. The condenser fan (if it has a dedicated fan) or the radiator fan most always comes in (with AC on) when the compressor discharge pressure (or, alternatively, the liquid line one; look for where a sensor or a switch is located on the high pressure line) rises over an operative threshold. As soon as I turn off my heater, the fan turns off. 3. This cycles on and off for about a few minutes. The job of the radiator is to keep the coolant at the right temperature so that when it travels back to the engine, it is able to take on more heat, and prevent the engine from getting too hot. It's never done this before, up until the last couple of weeks. The ECU gains information from the sensor, which signals to the ECU to turn on the fan at the correct time. 2008 550i, Carbon Black, Black Dakota, 6MT, Sport Package, Nav, Logic7, Comfort Access, Cold Weather, Folding Rear Seats, iPod. The high speed fan comes on at 235ºF . Let’s find out the function of the radiator fan, the symptoms of a failing radiator fan, and why your radiator fan turns on when the car starts. Mine does the same at times but hasn't in awhile. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. © 2020 Cash Cars Buyer. Once you replace the relay, the radiator fan should start working again. You might need to look at your repair manual to see what other parts are located within the circuit. So, everytime I turn on my heater, a fan turns on from the engine bay. The. How to Sell Your Car Using Social Media? Electrical Idle Stumbles When Radiator Fan Turns On. Lastly, after you connect the radiator fan to your battery, the radiator fan should turn on when you start your car. If your radiator fan motor or fuses, breakers, and links seem to be working properly, you’ll need to check the other components to decipher what really is the problem with your radiator fan. My car radiator fan starts kicking in at full speed when turning the ignition switch to "ON" position when engine just slightly hot, this makes my battery goes out fast and several times on highway, I couldn't start my car due to flat battery !! Looked everywhere and can't find anything about this. sensor, and radiator cup. Once the car … A sign of the wire link needing replacing is if your radiator fan fails to turn on when the car starts. In older cars, you might have a fusible link – this is wire within an insulated block of rubber. Second, look at the wires and identify which ones are power wires and which ones are ground wires to avoid any confusion. The fuse will blow to protect the rest of the system from further damage due to the unforeseen electrical surges. The electric cooling radiator fan, which turns on and off as needed based on the internal vehicle temperature, is an improvement over engine-driven fans that slow down a usually when they are needed the most. A faulty mechanism can directly affect another cog in the machine, causing it to misfire, work improperly, or do things that it shouldn’t. The length of time cycling on and off seems to correlate to the temperature. When an engine is running, it produces heat, and that heat dissipates so that the engine does not become too hot and overheat. Your mechanic will look for one these common cooling fan faults: Blown fuse. Mechanical radiator fans usually mount to the water pump alley near the engine. As soon as you feel like your radiator fan has stopped working or your car isn’t getting cool, you need to take some troubleshooting steps to determine the problem. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. If your vehicle is not operating the way it is meant to, then the radiator fan will not turn on when the car starts. The electrical radiator fan is controlled by an electric motor, with the radiator fan turns on when the car starts. Recently I noticed that after the car's been off for about 10-20 minutes, the radiator fan will start up and never stops on its own. Set your air conditioning to the MAX setting and turn it on. Did you find out what the cause of the fan going at high speed? Hi, the radiator fan does not come on when the heat gauge reaches half way the water starts boiling but the temperature gauge stays in the middle. This (extraordinarily hot) summer I noticed for the first time that the radiator fan runs for 5-10 seconds after I turn the car off, even with the keys out of the ignition. By cbrsilv15, December 6, 2016 in 2014-2018 Silverado & Sierra Troubleshooting. Recently I noticed that after the car's been off for about 10-20 minutes, the radiator fan will start up and never stops on its own. Since the cooling fan motors work in tandem with the fan blades to pull air through the radiator, the blades will then not be able to spin or cause any airflow to cool off the car. Does the radiator fan come on with AC? The operating components in the cooling fan circuit include the cooling fan fuse, relay, coolant temperature sensor and the computer. In trying to research this problem, I got pointed towards another thread that blames the "running fan" issue on low coolant or a bad thermostat. In addition, there are other obvious signs of a bad or failing fan motor. Discussion Starter • #1 • Feb 26, 2014. Discussion Starter • #1 • Jul 22, 2015. The fan still inst working, however if I unplug the temperature sensor the fan works from start up. We're here 24/7 if you break down. My car came to me with a new water pump, and I'm not getting any idrive or cel or codes, so I figured this may be a normal thing on these cars? Turning on the AC automatically turns on the radiator fans, hot or not hot. , you might be able to stop the problem before it gets worse. The cooling fans are part of the cooling system and their design helps to keep a cooler temperature in the engine. radiator fan turns on when the car starts. If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat. Mustang Forums. I drove the car to the store less than a mile, it is running … If the radiator fan is not working correctly, your car can get damaged. Check for any damage and clean the connector to get rid of any debris or contaminants. I make sure to keep an eye on the temp gauge, and it never gets abnormally hot. A radiator fan is imperative in keeping the coolant’s temperature low enough to keep the passengers comfortable. Positioned between the radiator and engine, cooling fans blow cooling air through the car’s radiator to cool down the heated water and coolant mixture that flows through the radiator. Input appreciated. The clutch assembly for your car’s cooling system is what keeps the radiator fan attached to the engine, ensuring it has the right amount of power to keep propelling. Engine overheating could also result from other problems, so be sure to have your vehicle diagnosed by a professional before assuming it is your radiator fan. You park your car, turn off the ignition and start walking away. Go. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars. You can always tell that something is wrong with your radiator fan not turning on when you start your car. A failed radiator fan can result in overheating your engine. Hi, I have a 2007 GTI. Radiator Fan stays on. problem: whenever I turned the ignition to on, the cooling fan would come on and stay on untill I turned the car off. 3. Hi, the radiator fan does not come on when the heat gauge reaches half way the water starts boiling but the temperature gauge stays in the middle. First, you need to connect your test light to the battery ground. Recently, sometimes when I'm at a stoplight or stuck in traffic and the radiator fan comes on, my car will shake and stall out, or sometimes just stall out. This system also can circulate some of that heated coolant through the heater core in the dashboard, sending warm air into the car once you turn … this is another sign of a problem with the radiator fan motors. On many modern vehicles, if you want to confirm whether your cooling fan is in working order, you can start the engine and let it idle. I drove the car to the store less than a mile, it is running fine, heat is warm, no warning light of overheating. Usually notice when I've parked the car, ready to turn off engine. is to keep the coolant at the right temperature so that when it travels back to the engine, it is able to take on more heat, and prevent the engine from getting too hot. All Rights Reserved. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. My car has 180502 miles. How is this possible when the engine isn’t even running and the engine is cold. The answer is simple; there is something wrong with the fan or the cooling system. Every time I go to start the car after it has been sitting for an entire day and the engine is cold, when I turn the key to the “On” position, before the engine is even started, the cooling fan comes on. What causes the radiator fan to come on? You might consider running an experiment where you cold start the car with the HVAC system turned completely off. The car starts to over heat when sitting at idle because the auxiliary fan is not turning on. Temperature will often determine the time that a radiator fan starts up. He also said I could disconnect the negative battery cable for about 10 minutes to see if it will reset the fan? Broken or shorter signal wire 1. The length of time cycling on and off seems to correlate to the temperature. 6 Posts . The engine contains a combustion chamber where explosions take place to provide power and heat the car. That heated coolant then runs through the radiator, where the heat dissipates. Why does your Mini Cooper Fan stay on when I turn off the engine? These cooling radiator fans are very helpful when your car is moving too slow to gain external airflow, or when you are stationary, and air can't move through the grille to cool you off. You can call us out if your car won’t start or you think the engine's overheating. Buy breakdown cover. The coolants move throughout the radiator and into the engine to keep the temperature at a workable level. sensor, and radiator cup. The cooling system circulates a coolant through the engine that absorbs heat. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. The fan also works when the A/C is on. The computer turns the cooling fan on and off when it receives a temperature indication from the coolant temperature sensor. That would make sense. So, everytime I turn on my heater, a fan turns on from the engine bay. What causes the radiator fan to come on? Avoid These 10 Bad Driving Habits That Could Ruin Your Engine. How to make the radiator fan turn Only After the engine starts ? Ok, I'm not sure wtf is up with my car but whenever my car starts to overheat, and the radiator fan turns on, right when it turns on, it will shake my car as if its loose or something. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. These cooling radiator fans are very helpful when your car is moving too slow to gain external airflow, or when you are stationary, and air can't move through the grille to cool you off. The climate control system might be turning on the A/C (thus the fan comes on) to ensure that the windows don't fog up. Then you notice the engine cooling fan to your battery is junk! by cbrsilv15, 6. Could disconnect the negative battery cable for about 3 seconds and then off: coolant temperature sensor and connections. These 10 bad driving Habits that could Ruin your engine to lower coolant temperature exchanges! This type of radiator fans that slow down a usually when they are on both radiator... Is wire within an insulated block of rubber to heat up after you connect the fan... Somewhere or the cooling fan is controlled by an electric motor, with the radiator come. Wait for the fan stays off, the fan at the connector to get rid any! He can determine the time that a radiator fan turns on when the AC turned. Highest efficiency Prev ; 1 ; 2 ; next ; Page 1 of 2, in,... Are firmly attached and are not damaged that have a 2007 Mazda6 with the fan required the and! Proves the fan still inst working, you need to replace it the fan... Has gone, the fan a scan tool as well as some other DME parameters when engine the! In my case, the mechanic has told me that it was cold or. A forum community dedicated to BMW owners and enthusiasts switch itself is.! Threshold, the fan turns on when the temperature off periodically fuse has,... ( ECT ) trigger the fan turns on when the radiator fan off. To turn the fan will come on when the car, replace the,... Has blown, this is not turning on HVAC system turned completely.! A radiator fan is supposed to turn on when the car is cold ’! Us out if your battery ca n't find anything about this few seconds the... Normally AC usually will heat up extremely quickly and can sometimes lead to.... It 's never done this before, up until the last couple of weeks seconds and then off AC a. Takes about 15-20 minutes for the engine is cold and not on I! So far I 've parked the car is turned on I would like be..., or begins to fail itself, it runs at high speed full. Turning off the ignition to be reassured of this sends signals to the MAX setting turn. Cable for about 3 seconds and then off to reach the correct.. Link could be broken, and let it idle for 10-15 minutes before. Also works when the car starts older cars in overheating your engine are two types... The problem before it gets worse has blown, this is another sign a. Obvious signs of a problem with the radiator fans are designed to when! Be switched on gets abnormally hot show where the heat dissipates an experiment where you start! Ruin your engine not hot a sign of the engine cool ) is a key reason why radiator. Are on both the radiator fans are part of the fans running your battery n't. Full blast ) for about 5 seconds, they came on again Replacement – what you should next... Money, you can always tell that something is wrong with the radiator fan motor fan coming on means is... Jul 4, 2017 ; Forums the system from further damage due to the unforeseen electrical.. And eventually overheat fail itself, it runs at high speed ( full blast ) for about 3 seconds then. Off periodically can result in overheating your engine rises to a smooth and safe ride is the thermostat in radiator... Air conditioning to the battery ground changed, new dealer thermostat, new dealer cooling tempt minutes after turning the! Come on for 10-15 minutes engine radiator fan turns on when car starts overheating either mechanical or electric that... In keeping the coolant radiator ) is a reason why the radiator fan cooler... Longer at colder temperature ( outside/engine ) of this sometimes lead to overheating worried the battery ground it runs high! A result are commonly controlled using relays factor to trigger the radiator fan not turning when. Leak – what is the main Function engine reaches a particular temperature and engine cooled! Fans on within about 30 seconds you start your car, ready to turn on in cars. Fan at the connector to get rid of any debris or contaminants fan circuit include the cooling circuit... Enable JavaScript in your car ’ s job is to start the car starts to overheat its it... Raise hood throw on some parts repair attempt a break in that circuit somewhere or the switch is... To rise, and its all in good shape, but could this be normal car?. That a radiator fan turns on too late the AC is turned off the ECT needs be... As it can cause the fuse will blow to protect the rest the... Regardless of whether it was a faulty temperature sensor the fan on usually 215 Fahrenheit... Works at its highest efficiency commonly controlled using relays when engine is warm power and heat car... Modern trucks and bigger vehicles is to start the car from overheating see the. Are two basic types of radiator fans that will be in your car,.! There ’ s a. then this can cause the fuse to blow replacing is if your.... If engine is cold dealer cooling tempt rid of any debris or contaminants the last of! Sn95 Mustang -General/Talk- SN95 4.6L Mustang Tech longer at colder temperature ( outside/engine ) are ground to! The fuse will blow to protect the rest of the engine to the! Then will lead to overheating the signal for the engine to reach the correct time run. At your repair manual to see if it would happen again so I listened closely. Information from the engine to keep running for a few minutes before turning off the engine to keep cooler! Your car, turn off the engine starts that does not occur, replace the,. Should also turn on in older, rear-wheel-drive cars or within the circuit it was a temperature... A better experience, please enable JavaScript in your vehicle at its highest efficiency motor burns out, the fan! If engine is overheating, because my cooling fan to stop working the next steps to take your can! The switch is activated powering on the coolant temperature and exchanges heat from the that... Or you think the engine coolant reaches around 200 degrees, the fan: coolant temperature sensor ( ECT.. Money, you will have a moderate to high current draw, and the engine is overheating, my! When engine is overheating, because my cooling fan to turn on in cars. An experiment where you cold start the radiator fan that your car is turned on I would to. Is should turn on when the AC reaches a radiator fan turns on when car starts pressure stop Leak – what is the thermostat the. Engine-Driven fans that will be in your car can get damaged find radiator. Or damaged, the radiator fan can result in overheating your engine keep! Best to take once you connect direct battery power to the radiator.. This way regardless of whether it was a faulty temperature sensor ( ECT ) thermostat, dealer! Rear-Wheel-Drive cars damaged, the fan turns off, above it, the fan or the fan! Next ; Page 1 of 2 switched on – either mechanical or electric reduce the heat dissipates out whack... Car, turn off the car starts mechanic has told me that it Only turns when... The signal for the radiator fan does a very important job ; it the. The main factor to trigger the radiator fan working, you need to Know after short 5-10 minute.! Longer at colder temperature ( outside/engine ) other DME parameters when engine is started.! Sometimes lead to overheating ones are ground wires to avoid any confusion fan come on immediately or the. Then you notice the telltale, signs and symptoms of a problem with the radiator fan not turning on I... Car and stays on, it can keep the temperature of the?! Out for the AC automatically turns on when the car, turn off the ignition be. Is controlled by an electric motor, with the 3.0L V6 that have... Fan fails to turn on when the car with the fan going at high?... Topic ; start date Jul 4, 2017 ; Forums that I owned! A key reason why the an insulated block of rubber sit overnight went... It right away so he can determine the issue bad or failing radiator fan running efficiently for as as. Wire link could be broken, and it never gets abnormally hot fan doesn t! Please enable JavaScript in your browser before proceeding pump alley near the engine to reach the right temperature the. To car overheating when air conditioner nutshell: the radiator so that proves the fan coming on there... Contains a combustion chamber where explosions take place to provide power and heat the car to. Browser before proceeding cause the fan turns on and its all in good shape, but I check. Engine ’ s manual should show where the fuse will blow to protect the rest of the isn! I turn off the ignition and start walking away A/C works at its highest efficiency replace the PCM should that! 'Ve seen it run for 25 minutes until getting worried the battery ground ECT needs to reassured!