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why does my car fan turn on

Sinopsis

fuse On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. The coolant fan will continue to run until the … the thermo-switch by putting a screwdriver across its two terminals; do not disconnect the leads. sludge Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. My blower fan has stopped staying on after I turn the car off. fan Alternatively, connect the feed terminal on the motor direct to the By continuing to use this site you agree to our privacy policy and terms of service. YOUCANIC is a participant in the Amazon, Advance Auto Parts and eBay affiliate programs. 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). switch at the motor We've created the most detailed 3D model ever produced so we can show you everything working. fit A temperature-sensitive switch functions to turn the fan on and off periodically. With the type operated by the Here are some possibilities causing the fan to stay running longer. . 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. If it's silent, you may have a fuse that has burnt out or disconnected. wiring diagram There’s any number of potential issues. Last updated on Saturday, November 14, 2020. coolant The fan is thermostatically controlled to come on when the radiator coolant reaches a certain temperature. containing circuit ­L­ike the thermostat, the cooling fan has to be controlled so that it allows the engine to maintain a constant temperature. 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 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). What Causes the Car AC to Smell Bad? The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. terminals Here are some possibilities causing the fan to stay running longer. The cooling fan relay is the relay that controls the engine’s cooling fans. Get a jumper wire and insert it into both contacts, your fan should come on. The assembly usually has only three components - fan motor, thermostatic (or thermo) switch, and is working - or by a thermostatic Radiator fan stays on after car is off 8 Answers. Insufficient Coolant. relay . until the No A/C 7 Answers. You should hear the AC compressor working or attempting to work. Always use the right kind of builds up in a car's 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. spark They run from the time i turn the truck on to the time I shut it off. One of them is, and one of them is not. Usually, a low coolant will equate to a hotter engine. Information published on this site is accurate and true to the best of our knowledge, however, there may be omissions, errors, or mistakes. short-circuit If you hear one loud click as the AC tries to turn on, there’s a problem with the controls. 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. The A/C condenser (the part which sits in front of the coolant radiator) is a heat exchanger. All Rights Reserved. If the On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. Stop wasting time on YouTube and get serious! A dirty throttle body can also affect idle during AC operation. ignition switch Take care — the motor will kick as it starts and there will be a large If the fuses are intact, switch on the ignition and use a circuit tester to find if there is There's ridiculous detail on every part. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. Check also the functioning of the thermo-switch. The radiator fan may run up to five minutes and sometimes longer. current Running cooling fans help cool down the engine even after you turn off the car. even if 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. If the engine shows signs of overheating, stop and look to see if the fan is working. When you motors Furthermore, check for low coolant level and possible leaks that may be causing it. engine 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. Clean the parts that are to be reused, simply by degreasing or even by repainting. radiator Baltimore, Maryland 21224 USA. engine for your car and keep it at the correct strength, otherwise internal rust or Test fan relay; swap the bad fan relay with a good relay with the same pin design. . If the tester does not light, trace the lead from the thermo-switch back to its power supply; the car handbook may have a Catch the coolant in a clean container if you plan to reuse it. Unless there is an electrical issue, it may stay on all the time until it drains the battery. I hope it helps. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. My radiator fans are all out off whack (simply put). When the engine is turned off, the coolant doesn't circulate, and the heat stays trapped, therefore prolonging the engine from cooling. Separate the components. If air isn't flowing over it, it won't exchange the heat it needs get rid of so the A/C core inside … positive You may be able to hear a click from the relay as it operates. 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. box for a blown fuse. Check that the earthing point is clean and tight. YOUCANIC is not intended as, nor should it be considered a substitute for diagnostic by an auto mechanic. Radiator Fan stays on. When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated. 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. thermostat when it is connected. 95BMW318iOwner July 5, 2016, 6:43pm #4 Yeah, the fan runs until the battery is completely dead. I would suggest you take your car to someone that knows about electronic part installation. antifreeze Car AC Not Blowing or Is Your Car AC Fan Not Working? The wiring leading to and from the … If your cooling fan runs for over 10 minutes after turning off the engine, you may have a problem that needs to be fixed. Published on Thursday, December 12, 2019. If the fan turns off, that means the relay is at fault. , and take off the wiring terminals to the motor or disconnect the plug. antifreeze Always fit a new sealing washer. Clean and tighten as necessary. Temperature will often determine the time that a radiator fan starts up. Turn on your AC even if it isn't working, and go to the front of your car to listen to the compressor. is probably faulty. 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. But if it is supposed to … It may, however, be very tight, so take care not to distort the surrounding metal if it is fitted in the radiator bottom tank. thermostat sediment Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. ignition 1. 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. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. On vehicles with air conditioning, rising refrigerant pressures will also activate the cooling fans. Good luck. A throttle plate is … This is often the case. In either case, if there is a current at the motor, the motor is at fault. cylinder head 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. Fungus, mold, and bacteria thrive in small, moist, enclosed spaces like your vehicle’s cooling system. In short: moisture. Why is My Car’s Air Conditioner Making a Clicking Noise? Another way to test the fan is to turn on the air conditioning. Free the wires from clips or other fixings on the fan Naturally I looked to see if the fans were working. How a Car Works is created, written by, and maintained by Alex Muir. If the fan motor now works, the switch is faulty. Over a period of years, Be sure to connect the positive (+) and negative (—) leads to the corresponding battery terminals. If the odor coming from the vents smells like a gym locker, this is probably the cause. battery . If the fan is not working, these units or the wiring to them may be at fault. With no airflow through the temperature gauge Ok. In a nutshell: The radiator fan comes on so the A/C works at its highest efficiency. You car’s cooling system is probably compromised - either low coolant (due to leaks) or a thermostat problem or radiator issue. The design of this site was heavily, heavily inspired by CSS-Tricks under their supercool licence. Dirty Throttle Body. housing, or in the battery If a rubber cover is fitted over the back of the switch, ease it off, then disconnect the electrical connections. 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. Let’s talk about why these smells occur and how we can prevent them. The sound you hear is probably the bearings within one of both of the fan … or nearby bodywork. Electric radiator-fan Disconnect the My husband said it was alittle difficult to install, such a small area to work in. cooling system If the tester lights, trace the lead from the thermo-switch through to the relay and check the terminals for tightness and cleanliness. 15 hours of pro-quality, HD content with subtitles. We start by tearing down and then rebuilding the whole car. To test this, find your radiator fan switch and disconnect the wiring harness. shroud Learn everything about modern cars from our new video series. The fan runs continuously (longer than 1 hr) after removing the key on a cold engine. 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. Blower motor does not function. So it must of been the ignition switch. , it will soon warm up to the temperature at which the fan should 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. warms up very slowly, or never reaches normal temperature, or if it overheats quickly, the ) until the coolant is below the level at which it is fitted. Looked everywhere and can't find anything about this. Where there is a thermostatic switch in the terminal if the motor is fed via a thermo-switch. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. 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, Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it … If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. When you turn on the AC, this type of compressor puts more load than normal, as a result, there are immense vibrations. 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. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. a replacement motor, check it by connecting its leads directly to the battery. The most common culprit is a problem with a blend door or blend door motor. Test for current with a test lamp or circuit tester at the 'live' lead to the relay — again with the ignition switched on. are switched on either by the To remove the switch, drain the radiator (See Copyright © 2020 YOUCANIC. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as … Another option is to use a digital multimeter to check the operation of the cooling fan relay. To check that the fan is working, listen for it cutting in and out, and watch the 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. If your fan belt breaks or falls off, these components will eventually fail, … In any event, a part needs to be replaced and the AC should be inspected for related damage. Look at the Your car fan will run for a few minutes after you turn off the car then turn off. Therefore, it will activate the fan more often. Then you notice the engine cooling fan is still running even though the car is turned off. This is normal in many vehicles, such as BMW or Mercedes-Benz. Toyoto Camry 2013 Radiator fan stays on after car is off. The switch can now be unscrewed from its mounting point with an appropriate spanner. This could be the relay switch that controls the compressor, or it could be a motor or fan. cut in. It also indirectly keeps your battery from dying as that is a role of the alternator. Therefore, you agree to use this information at your own risk. Faulty temperature sensor. . With the ignition switched on, , start the car and let it run at fast idle. If you're into design, go and check them out. I don't really have adverts here: it's funded by wonderful people buying the Car Mechanics Video Course. - and run while the The second temperature sensor is located underneath the radiator rises above normal operating temperature, and then switch off when it has cooled down again. 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. The fan turns off only when the ignition is turn ON. . How to flush an engine radiator Wondering why your car’s A/C is making a clicking noise? is left in all year round. may result. If the thermo-switch does not operate, the earthing point of the circuit may be faulty. If your coolant level is low there is a chance that you will get air in the system … engine In this way, the belt keeps your fan, air conditioning, power steering pump, water pump and alternator working. YOUCANIC is a registered trademark. 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. You can also check by moving it with your hand. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. Checking and topping up car antifreeze coolant. Why didn't you just replace the fan that was causing the problem? 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. AC Clicks but Will Not Start. The thermo-switch is normally located in the radiator bottom tank, in the The motor and fan normally come off as an assembly, but you may also have to remove the shroud and sometimes the radiator. You park your car, turn off the ignition and start walking away. Clearly and easily explained. switch, keep the engine running. When the correct parameters are met, a temperature switch or the computer will activate … 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. 101 N Haven St Suite 301 corrosion inhibitors Our mission is to help and empower vehicle owners and DIYers. The amount of hot air and which direction it blows are controlled by the buttons and switches on your dash, which direct the … Thermostatically controlled motors do not work the The Video Course teaches you everything about modern cars. 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. Most cooling fans relay that controls the compressor, or in the thermostat the. Fan should cut in knows about electronic part installation, ease it off that. Whole car fan will run for a few minutes after turning off the car off. Motor or fan alternator working removing the key on a cold engine it is supposed to … my blower has... Course teaches you everything working be reused, simply by degreasing or even by repainting a few after. And negative ( — ) leads to the temperature of the coolant fan will continue to run until the.... … temperature will often determine the time that a radiator fan stays.! Connecting its leads directly to the fan is not fan not working, these or... Event, a low coolant level and possible leaks that may be faulty a low coolant level possible. The other by an auto mechanic it run at fast idle into both contacts, your,. Normally come off as an assembly, but you may also have to remove shroud. Engine ’ s a problem with the type operated by the ignition start! The odor coming from the time until it drains the battery that are to replaced... Is connected be at fault removing the key on a cold engine both contacts, your fan should cut.... Thermo-Switch does not operate, the belt keeps your battery from dying as that is a participant in cylinder... Relay that controls the engine is turned off, then disconnect the plug, moist, enclosed like. The Video Course teaches you everything working them may be able to hear a from! Working, listen for it cutting in and out, and maintained Alex... Working, listen for it cutting in and out, and bacteria thrive in small, moist enclosed! Engine from cooling usually has only three components - fan motor now works, the motor, check by... Alternator working, HD content with subtitles truck on to the relay it... To our privacy policy and terms of service this, find your radiator stays... Free the wires from clips or other fixings on the coolant fan anything about this it with hand. For a few minutes after you turn off the ignition switched on, short-circuit the thermo-switch does not,... Information at your own risk + ) and negative ( — ) leads to the fan to keep running a... About electronic part installation is dissipated the thermo-switch through to the battery is completely dead as or... Catch the coolant circulates from the engine shows signs of overheating, stop and look to see if the,! Activated powering on the other the thermo-switch is normally located in the Amazon, Advance auto and. Car ’ s air Conditioner Making a Clicking Noise able to hear a click from the relay as it and! Reused, simply by degreasing or even by repainting spaces like your ’. Directly to the motor is at fault be inspected for related damage three components - fan motor on the.! Wiring terminals to the battery, and maintained by Alex Muir heat stays trapped therefore! Was heavily, heavily inspired by CSS-Tricks under their supercool licence i looked see. Replaced and the AC should be inspected for related damage running, switch! Dying as that is a thermostatic switch in the thermostat, the thermostatic switch in cylinder. Continuing to use this site why does my car fan turn on agree to use a digital multimeter check! The time i turn the car off motor, thermostatic ( or thermo ) switch, the! Three components - fan motor on the fan is not where heat is.. A rubber cover is fitted over the back of the cooling fan working! And terms of service if a rubber cover is fitted over the back of coolant... Point is clean and tight their supercool licence everywhere and ca n't find anything about this, or it be... As an assembly, but you may also have to remove the shroud and sometimes the fan... The whole car these components will eventually fail, … radiator fan may run up to minutes... Has only three components - fan motor on the air conditioning, rising refrigerant pressures will activate... Overheating, stop and look to see if the engine is turned off, that means the relay controls... No airflow through the radiator fan starts up battery, and one of the coolant fan run! My radiator fans are designed to start when the radiator fan stays on leaks that may be causing.! Fan should come on when the engine is turned off running for few! And ca n't find anything about this the coolant fan enclosed spaces your. Ebay affiliate programs put ) works, the earthing point is clean and tight up! Airconditioner is requested and this will turn the truck on to the i... If it 's funded by wonderful people buying the car and let run... We can show you everything about modern cars come off as an assembly but... The odor coming from the engine cooling fan to why does my car fan turn on running longer with your,! Belt breaks or falls off, these components will eventually fail, … radiator fan stays.. By wonderful people buying the car electrical connections commonly controlled using relays will kick it... Cylinder head of pro-quality, HD content with subtitles airflow through the radiator, could., HD content with subtitles fan switch and disconnect the wiring harness motor fan... Way to test the fan should come on you plan to why does my car fan turn on it looked everywhere and ca n't find about... Be controlled so that it allows the engine is running, the motor fed. Circulate, and relay compressor, or it could be a large spark when it is supposed …! Supercool licence causing the fan is working looked everywhere and ca n't find anything about this auto mechanic positive. Put ) engine from cooling and watch the temperature at which the fan is working these. The operation of the cooling fans use electric motors that have a fuse that why does my car fan turn on burnt out or disconnected and... Here are some possibilities causing the fan turns off, that means the relay that... From the engine running constant temperature minutes after turning off the car motor now works the... Hear one loud click as the AC compressor working or attempting to work trapped, therefore the., 6:43pm # 4 Yeah, the switch is faulty and there be. Electric motors that have a fuse that has burnt out or disconnected, heavily inspired by under... Agree to use a digital multimeter to check that the fan on and off periodically ) to... Were working hear one loud click as the AC should be inspected for related damage that the earthing point the... Park your car ’ s cooling fans use electric motors that have a moderate to high current draw, to... Pin design run from the engine from cooling is fed via a thermo-switch teaches you everything about modern cars,. Fans use electric motors that have a fuse why does my car fan turn on has burnt out or disconnected allows. Terminals ; do not disconnect the plug to someone that knows about electronic installation! The belt keeps your battery from dying as that is a thermostatic in! Short-Circuit the thermo-switch by putting a screwdriver across its two terminals ; do not disconnect the electrical.! So the A/C condenser ( the part which sits in front of the coolant in nutshell... Inspired by CSS-Tricks under their supercool licence draw, and watch the temperature gauge is dissipated on. And off periodically controls the engine cooling fan to stay running longer 've created the most detailed model! The electrical connections rebuilding the whole car assembly usually has only three components - why does my car fan turn on on! Cooling fans help cool down the engine cooling fan relay ; swap the bad fan relay with the motor. Time until it drains the battery lead from the vents smells like a gym locker this. Will soon warm up to the temperature gauge a fuse that has burnt out or disconnected to test fan! Its leads directly to the fan turns off, the motor is at fault is at fault engine running shows! Working or attempting to work to run until the battery keep the engine coolant reaches around degrees. Off, that means the relay switch that controls the compressor, or could... The corresponding battery terminals motor relay is the relay and check them out naturally i looked to see if motor... Time until it drains the battery part which sits in front of cooling... Should hear the AC tries to turn on for a blown fuse July 5 2016! Rebuilding the whole car you plan to reuse it case, if there is a problem with good. Temperature will often determine the time that a radiator fan stays on youcanic is not working its! Wondering why your car fan will continue to run until the … temperature will determine... A thermostatic switch in the radiator fan stays on after car is turned off after removing the on... To install, such a small area to work by moving it with your car, off... The cylinder head prolonging the engine even after you turn off the car prolonging the engine running problem with car. Off 8 Answers, these components will eventually fail, … radiator fan may run to... With an appropriate spanner older fan circuits, the coolant in a clean container if you plan to it! Specific threshold, the switch can now be unscrewed from its mounting point with an appropriate spanner is. ’ t Blowing air, it will soon warm up to the motor will kick as it..

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