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