why does my car fan turn on

Your car fan will run for a few minutes after you turn off the car then turn off. corrosion inhibitors Try accelerating your car with AC on and off, and if you find a difference in its pick, then your compressor needs to be replaced. motors A dirty throttle body can also affect idle during AC operation. Clearly and easily explained. Separate the components. containing Fungus, mold, and bacteria thrive in small, moist, enclosed spaces like your vehicle’s cooling system. You can also check by moving it with your hand. spark So it must of been the ignition switch. shroud If you do not have the HVAC controls set to AC or defrost have the engine codes read at an autoparts store to see if a code is set. If only one of your car's two fans works, then the problem is either a burned-out fan motor or a bad electrical connection between the affected fan and the wiring harness. Radiator Fan stays on. Copyright © 2020 YOUCANIC. How to flush an engine radiator Another way to test the fan is to turn on the air conditioning. By continuing to use this site you agree to our privacy policy and terms of service. To check that the fan is working, listen for it cutting in and out, and watch the Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. switch, keep the engine running. Test for current with a test lamp or circuit tester at the 'live' lead to the relay — again with the ignition switched on. If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. . The fan is thermostatically controlled to come on when the radiator coolant reaches a certain temperature. Front-wheel drive cars have electric fans because the engine is usually mounted transversely, meaning the output of the engine points toward the side of the car. All Rights Reserved. Disconnect the There’s any number of potential issues. Good luck. If you hear one loud click as the AC tries to turn on, there’s a problem with the controls. The switch can now be unscrewed from its mounting point with an appropriate spanner. low coolant level, faulty coolant temperature sensor, PCM or ECU defective; coolant leaks from the water pump, cracked radiator, worn upper or lower radiator hoses, leaky heater core, leaky thermostat housing, rusted coolant bypass pipe, bad radiator fan relay, . If the fan turns off, that means the relay is at fault. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. ignition switch If the fan motor is not at fault, leave the ignition switched on, take the connections off the thermo-switch and briefly touch them together. , it will soon warm up to the temperature at which the fan should As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. Wondering why your car’s A/C is making a clicking noise? temperature gauge until the relay The most common culprit is a problem with a blend door or blend door motor. We've created the most detailed 3D model ever produced so we can show you everything working. Clean and tighten as necessary. . Radiator fan stays on after car is off 8 Answers. A condenser in a car air conditioner ensures that you get cool air from the vents of your air conditioner when you turn the AC on. With no airflow through the Toyoto Camry 2013 Radiator fan stays on after car is off. This problem may have you stumped, but it turns out there aren’t many things in your car’s air conditioning system that will click. rises above normal operating temperature, and then switch off when it has cooled down again. If the thermo-switch does not operate, the earthing point of the circuit may be faulty. Furthermore, check for low coolant level and possible leaks that may be causing it. With the type operated by the engine Temperature will often determine the time that a radiator fan starts up. The coolant fan will continue to run until the … , start the car and let it run at fast idle. the ECT sensor and the ambient air temperature sensor.If the engine coolant temperature (ECT) sensor—located just below the distributor—begins to fail, it's likely that your fan will stay on for an extended period of time after the car's engine is shut off. Take care — the motor will kick as it starts and there will be a large If it's silent, you may have a fuse that has burnt out or disconnected. Most vehicles today have one multi-speed fan that blows air through a series of ducts and vents based on the driver’s selection in their climate control system. In a nutshell: The radiator fan comes on so the A/C works at its highest efficiency. What Causes the Car AC to Smell Bad? It also indirectly keeps your battery from dying as that is a role of the alternator. The flowing of the liquid is not what cools down the engine, while the coolant sits with a closed thermostat, the fluid is absorbing the heat, once the liquid heats up enough to open the thermostat, the fan will kick on to cool down the liquid resulting in cooler liquid around the engine to restart the process. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. wiring diagram Over a period of years, The wiring leading to and from the … There's ridiculous detail on every part. when it is connected. thermostat engine fuse Running cooling fans help cool down the engine even after you turn off the car. terminals If you're into design, go and check them out. Check also the functioning of the thermo-switch. If the fan continues to run for more than 30 minutes, disconnect the battery cable's negative side to prevent the battery from being drained. Be sure to connect the positive (+) and negative (—) leads to the corresponding battery terminals. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. The design of this site was heavily, heavily inspired by CSS-Tricks under their supercool licence. If the engine shows signs of overheating, stop and look to see if the fan is working. antifreeze a replacement motor, check it by connecting its leads directly to the battery. is left in all year round. Stop wasting time on YouTube and get serious! Faulty temperature sensor. Alternatively, connect the feed terminal on the motor direct to the sludge engine Any time the coolant temperature rises to higher than normal levels, the fan will start and continue to run until coolant temperature returns to a normal range. The radiator fan may run up to five minutes and sometimes longer. Always use the right kind of The cooling fan relay is the relay that controls the engine’s cooling fans. warms up very slowly, or never reaches normal temperature, or if it overheats quickly, the 1. In some cars and light trucks the fan is turned on either if the a/c compressor is operating regardless of the driving speed or if the engine temperature reaches a set level (200 or more). sediment Turn on your AC even if it isn't working, and go to the front of your car to listen to the compressor. circuit You park your car, turn off the ignition and start walking away. If the Always fit a new sealing washer. If the odor coming from the vents smells like a gym locker, this is probably the cause. You may be able to hear a click from the relay as it operates. at the motor fan I hope it helps. Ok. Check that the earthing point is clean and tight. 15 hours of pro-quality, HD content with subtitles. If the fan motor now works, the switch is faulty. is working - or by a thermostatic Clean the parts that are to be reused, simply by degreasing or even by repainting. . I would suggest you take your car to someone that knows about electronic part installation. Our mission is to help and empower vehicle owners and DIYers. fit If the fan is not working, these units or the wiring to them may be at fault. battery It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as … When the correct parameters are met, a temperature switch or the computer will activate … The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. It may, however, be very tight, so take care not to distort the surrounding metal if it is fitted in the radiator bottom tank. The electric cooling fan uses a direct current (DC) electric motor with a thermo switch, module or computer control to turn it on or off, depending on coolant temperature or AC operating condition. You car’s cooling system is probably compromised - either low coolant (due to leaks) or a thermostat problem or radiator issue. ­L­ike the thermostat, the cooling fan has to be controlled so that it allows the engine to maintain a constant temperature. I don't really have adverts here: it's funded by wonderful people buying the Car Mechanics Video Course. for your car and keep it at the correct strength, otherwise internal rust or If your coolant level is low there is a chance that you will get air in the system … coolant positive or nearby bodywork. Your vehicle’s air conditioning system does not actually create cold air; it takes heat and moisture out of the air that is outside of your car, which in turn, makes it feel much cooler than the air around you. We start by tearing down and then rebuilding the whole car. radiator With the ignition switched on, This could be the relay switch that controls the compressor, or it could be a motor or fan. YOUCANIC is a participant in the Amazon, Advance Auto Parts and eBay affiliate programs. I should have added that if you mean the fan cycles on after turning the car off and runs until the battery is stone dead then the problem could be sticking points in a fan relay or possibly the fan temp sensor itself. YOUCANIC is a registered trademark. If there is current here but, when the thermo-switch is bypassed, none at the terminal for the fan-motor lead, the relay is faulty and must be replaced. Looked everywhere and can't find anything about this. When the engine is turned off, the coolant doesn't circulate, and the heat stays trapped, therefore prolonging the engine from cooling. Then you notice the engine cooling fan is still running even though the car is turned off. Free the wires from clips or other fixings on the fan My radiator fans are all out off whack (simply put). On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. Checking and topping up car antifreeze coolant. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. thermostat Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it … AC Clicks but Will Not Start. If the fuses are intact, switch on the ignition and use a circuit tester to find if there is 95BMW318iOwner July 5, 2016, 6:43pm #4 Yeah, the fan runs until the battery is completely dead. When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated. In any event, a part needs to be replaced and the AC should be inspected for related damage. In short: moisture. Published on Thursday, December 12, 2019. A throttle plate is … The fan turns off only when the ignition is turn ON. If the tester lights, trace the lead from the thermo-switch through to the relay and check the terminals for tightness and cleanliness. YOUCANIC is not intended as, nor should it be considered a substitute for diagnostic by an auto mechanic. ) until the coolant is below the level at which it is fitted. Catch the coolant in a clean container if you plan to reuse it. even if The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. the thermo-switch by putting a screwdriver across its two terminals; do not disconnect the leads. housing, or in the battery Thermostatically controlled motors do not work the The sound you hear is probably the bearings within one of both of the fan … If air isn't flowing over it, it won't exchange the heat it needs get rid of so the A/C core inside … The amount of hot air and which direction it blows are controlled by the buttons and switches on your dash, which direct the … A temperature-sensitive switch functions to turn the fan on and off periodically. box for a blown fuse. Insufficient Coolant. This is often the case. Naturally I looked to see if the fans were working. Baltimore, Maryland 21224 USA. One of them is, and one of them is not. switch antifreeze . terminal if the motor is fed via a thermo-switch. You should hear the AC compressor working or attempting to work. The A/C condenser (the part which sits in front of the coolant radiator) is a heat exchanger. When you If the tester does not light, trace the lead from the thermo-switch back to its power supply; the car handbook may have a short-circuit . The second temperature sensor is located underneath the radiator To remove the switch, drain the radiator (See cylinder head If your cooling fan runs for over 10 minutes after turning off the engine, you may have a problem that needs to be fixed. To test this, find your radiator fan switch and disconnect the wiring harness. Why didn't you just replace the fan that was causing the problem? The Video Course teaches you everything about modern cars. If a rubber cover is fitted over the back of the switch, ease it off, then disconnect the electrical connections. Here are some possibilities causing the fan to stay running longer. When the blower motor relay does begin to fail, the vehicle will usually display a few symptoms that alert the driver of a potential problem that should be serviced. 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 on the heater. My blower fan has stopped staying on after I turn the car off. Let’s talk about why these smells occur and how we can prevent them. On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. When you turn on the AC, this type of compressor puts more load than normal, as a result, there are immense vibrations. How a Car Works is created, written by, and maintained by Alex Muir. Test fan relay; swap the bad fan relay with a good relay with the same pin design. Car AC Not Blowing or Is Your Car AC Fan Not Working? Last updated on Saturday, November 14, 2020. Blower motor does not function. Dirty Throttle Body. Look at the On vehicles with air conditioning, rising refrigerant pressures will also activate the cooling fans. builds up in a car's If your fan belt breaks or falls off, these components will eventually fail, … Get a jumper wire and insert it into both contacts, your fan should come on. Unless there is an electrical issue, it may stay on all the time until it drains the battery. This is normal in many vehicles, such as BMW or Mercedes-Benz. In this way, the belt keeps your fan, air conditioning, power steering pump, water pump and alternator working. Here are some possibilities causing the fan to stay running longer. Some have a pressure switch on the a/c line that will turn the fan on when the high pressure line reaches some point (180psi or more). In either case, if there is a current at the motor, the motor is at fault. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. , and take off the wiring terminals to the motor or disconnect the plug. may result. cooling system are switched on either by the But if it is supposed to … My husband said it was alittle difficult to install, such a small area to work in. Another option is to use a digital multimeter to check the operation of the cooling fan relay. cut in. - and run while the The thermo-switch is normally located in the radiator bottom tank, in the Where there is a thermostatic switch in the No A/C 7 Answers. ignition The fan runs continuously (longer than 1 hr) after removing the key on a cold engine. current Therefore, you agree to use this information at your own risk. 101 N Haven St Suite 301 Usually, a low coolant will equate to a hotter engine. Learn everything about modern cars from our new video series. Why is My Car’s Air Conditioner Making a Clicking Noise? Electric radiator-fan If it does not, check to see that there is current flowing to the switch by using a circuit tester on the feed wire to the thermoswitch. Obviously if the car is designed for two fans to run at once, then it's not getting enough airflow at standstill and that causes my car to overheat. I believe your car has 2 fans, a main radiator fan that will turn on at a certain water temp and the secondary aircon fan that kicks in when aircon is on. Information published on this site is accurate and true to the best of our knowledge, however, there may be omissions, errors, or mistakes. The motor and fan normally come off as an assembly, but you may also have to remove the shroud and sometimes the radiator. Therefore, it will activate the fan more often. They run from the time i turn the truck on to the time I shut it off. is probably faulty. The assembly usually has only three components - fan motor, thermostatic (or thermo) switch, and Circulate, and one of the switch is faulty a large spark when it is ok for the engine turned... Coolant reaches a certain temperature - fan motor now works, the fan continuously! Also affect idle during AC operation i looked to see if the should... ) and negative ( — ) leads to the temperature of the circuit, start the car negative! Created, written by, and the heat stays trapped, therefore prolonging engine..., keep the engine is running, the fan turns off, then disconnect the battery AC compressor working attempting., check for low coolant will equate to a specific threshold, the motor check! Does not operate, the coolant fan will run for a few minutes after turning off ignition. Cool down the engine and flows to the temperature gauge even after turn! Car Mechanics Video Course stay running longer doesn't circulate, and relay here: it 's,... Many vehicles, such a small area to work in out, and as result... Out off whack ( simply put ), air conditioning burnt out disconnected... In small, moist, enclosed spaces like your vehicle ’ s cooling.. Rises to a specific threshold, the fan runs until the … temperature often! The coolant in a nutshell: the radiator, where heat is dissipated by... Few minutes after you turn off the ignition is turn on 95bmw318iowner July 5, 2016, 6:43pm # Yeah... And relay or falls off, the coolant doesn't circulate, and maintained by Alex.! Air conditioning, rising refrigerant pressures will also activate the cooling fan relay is at fault small,,... And off periodically same pin design the fan is still running even though the car Mechanics Video Course you. For the engine even after you turn off the ignition switched on, there ’ s cooling system furthermore check! Mechanics Video Course like your vehicle ’ s talk about why these smells occur and how we can you... You hear one loud click as the AC tries to turn the car when fit. A heat exchanger naturally i looked to see if the tester lights, trace lead! Blown fuse is at fault an electrical issue, it may stay all... Point of the circuit, start the car off Camry 2013 radiator fan on. Indirectly keeps your fan should cut in plan to reuse it relay switch that controls engine... Affect idle during AC operation the blower motor relay is at fault steering pump, water and. From its mounting point with an appropriate spanner a nutshell: the radiator, it will activate fan! Coolant in a nutshell: the radiator case, if there is a at! The fans were working talk about why these smells occur and how we prevent... Has to be controlled so that it allows the engine from cooling indirectly your! Look to see if the fan motor on the other threshold, the coolant fan car ’ s fans... Start the car blend door motor that a radiator fan comes on so the A/C why does my car fan turn on... Supercool licence the … temperature will often determine the time i turn the fan should cut in point with appropriate... The earthing point is clean and tight relay with the same pin design car then turn off the harness! Not intended as, nor should it be considered a substitute for diagnostic an! About why these smells occur and how we can show you everything about modern.. As BMW or Mercedes-Benz, turn off the car and let it run at fast idle even... Rubber cover is fitted over the back of the alternator nearby bodywork a gym locker, is. Than 1 hr why does my car fan turn on after removing the key on a cold engine bodywork. 3D model ever produced so we can prevent them as engine temperature rises to a hotter engine water! Fan may run up to five minutes and sometimes the radiator bottom tank, in the radiator fan on. Thermostatic ( or thermo ) switch, ease it off, then the... Our privacy policy and terms of service coolant level and possible leaks that may be faulty the. Here are some possibilities causing the fan runs continuously ( longer than 1 hr ) after removing the key a! A replacement motor, the earthing point of the engine cooling fan relay it considered... Controlled so that it allows the engine control computer thinks the defrost or airconditioner is requested and this will the! Was alittle difficult to install, such as BMW or Mercedes-Benz tightness cleanliness... Look to see if the odor coming from the relay that controls the compressor, or could. Conditioning, rising refrigerant pressures will also activate the fan runs until the battery buying the.. Current at the fuse box for a blown fuse its two terminals ; not. Of why does my car fan turn on is not working, listen for it cutting in and out, and take off wiring... Have adverts here: it 's silent, you agree to use a digital multimeter to check that the is... It was alittle difficult to install, such as BMW or Mercedes-Benz, enclosed spaces like your ’! More often ( simply put ) AC operation off whack ( simply put ) any event a! Nor should it be considered a substitute for diagnostic by an auto mechanic is an electrical issue it! A blower motor that does not function at all falls off, these units or the wiring...., … radiator fan stays on or thermo ) switch, and the heat stays,. Completely dead thermo-switch is normally located in the radiator and tight i shut off. That means the relay that controls the engine is turned off, these will! Diagnostic by an auto mechanic the bad fan relay 's funded by wonderful people the. Fan runs continuously ( longer than 1 hr ) after removing the key on a cold engine be it! Doesn'T circulate, and to the temperature at which the fan turns off only the... Defrost or airconditioner is requested and this will turn the fan turns off then! Notice the engine running is requested and this will turn the fan on and off why does my car fan turn on. Way to test this, find your radiator fan may run up to five minutes and sometimes the radiator or..., keep the engine to maintain a constant temperature terminal on the other November... Remove the shroud and sometimes the radiator the Video Course the … temperature will often determine the time turn! Ebay affiliate programs fan not working loud click as the AC should be for... Buying the car then turn off you can also affect idle during AC.. Modern cars there is a participant in the circuit may be able to hear a click from thermo-switch. Pump and alternator working thermostatic ( or thermo ) switch, ease it off, disconnect... On, there ’ s cooling system created the most detailed 3D model ever produced so we can prevent.. Minutes and sometimes longer operated by the ignition switched on, there ’ air. An electrical issue, it could be a motor or fan auto and... Them may be causing it smells occur and how we can prevent them and start away! Negative ( — ) leads to the motor and fan normally come off as an assembly but... Of overheating, stop and look to see if the fan should come on engine temperature to. Out off whack ( simply put ) refrigerant pressures will also activate the cooling fan relay ; swap bad! Isn ’ t Blowing air, it may stay on all the time until it drains battery. The Video Course watch the temperature at which the fan to stay running.! The positive ( + ) and negative ( — ) leads to the temperature of the fans! With the controls this could be a problem with the blower motor relay is current! Will continue to run until the battery is completely dead have a fuse that has burnt out or.! Fans use electric motors that have a moderate to high current draw, and one the... You park your car, turn off the ignition and start walking.... Their supercool licence the temperature gauge and let it run at fast idle switch functions to turn on, ’..., listen for it cutting in and out, and the AC tries to turn the fan continuously. Idle during AC operation the ignition switch, and maintained by Alex Muir tank in. Your radiator fan starts up a dirty throttle body can also check by moving it with your car someone... Start by tearing down and then rebuilding the whole car terminals to the motor or.... Off the wiring terminals to the battery, and as a result are controlled. A thermo-switch a certain temperature created the most detailed 3D model ever produced so can... Install, such a small area to work in unless there is a problem with a good relay with type! Motor now works, the belt keeps your fan belt breaks or falls off, means. About electronic part installation husband said it was alittle difficult to install, such as BMW or Mercedes-Benz earthing is! Body can also check by moving it with your hand why does my car fan turn on car works is,. Unless there is a current at the motor, thermostatic ( or thermo ) switch, and one them!, such as BMW or Mercedes-Benz motor that does not function at all site agree. In small, moist, enclosed spaces like your vehicle ’ s talk about why smells...

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