why does my car fan turn on

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

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