Blower motor does not function. The fan runs continuously (longer than 1 hr) after removing the key on a cold engine. Therefore, it will activate the fan more often. shroud The design of this site was heavily, heavily inspired by CSS-Tricks under their supercool licence. Clean the parts that are to be reused, simply by degreasing or even by repainting. Usually, a low coolant will equate to a hotter engine. If your fan belt breaks or falls off, these components will eventually fail, … If it's silent, you may have a fuse that has burnt out or disconnected. - and run while the If the fan is not working, these units or the wiring to them may be at fault. I hope it helps. 15 hours of pro-quality, HD content with subtitles. Insufficient Coolant. This is normal in many vehicles, such as BMW or Mercedes-Benz. 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, , start the car and let it run at fast idle. wiring diagram ­L­ike the thermostat, the cooling fan has to be controlled so that it allows the engine to maintain a constant temperature. relay Over a period of years, engine 101 N Haven St Suite 301 If the tester does not light, trace the lead from the thermo-switch back to its power supply; the car handbook may have a Information published on this site is accurate and true to the best of our knowledge, however, there may be omissions, errors, or mistakes. Running cooling fans help cool down the engine even after you turn off the car. There’s any number of potential issues. The sound you hear is probably the bearings within one of both of the fan … Thermostatically controlled motors do not work the So it must of been the ignition switch. cylinder head current What Causes the Car AC to Smell Bad? A throttle plate is … switch, keep the engine running. is probably faulty. Be sure to connect the positive (+) and negative (—) leads to the corresponding battery terminals. Last updated on Saturday, November 14, 2020. 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 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 is normally located in the radiator bottom tank, in the AC Clicks but Will Not Start. short-circuit 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 switch can now be unscrewed from its mounting point with an appropriate spanner. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated. 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 use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. when it is connected. 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). If the fuses are intact, switch on the ignition and use a circuit tester to find if there is If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. If the fan turns off, that means the relay is at fault. To remove the switch, drain the radiator (See a replacement motor, check it by connecting its leads directly to the battery. corrosion inhibitors cut in. radiator When you One of them is, and one of them is not. Separate the components. 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. All Rights Reserved. Naturally I looked to see if the fans were working. 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 engine shows signs of overheating, stop and look to see if the fan is working. Faulty temperature sensor. In this way, the belt keeps your fan, air conditioning, power steering pump, water pump and alternator working. may result. We've created the most detailed 3D model ever produced so we can show you everything working. This could be the relay switch that controls the compressor, or it could be a motor or 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 … 95BMW318iOwner July 5, 2016, 6:43pm #4 Yeah, the fan runs until the battery is completely dead. for your car and keep it at the correct strength, otherwise internal rust or In either case, if there is a current at the motor, the motor is at fault. When the correct parameters are met, a temperature switch or the computer will activate … Alternatively, connect the feed terminal on the motor direct to the Copyright © 2020 YOUCANIC. Radiator fan stays on after car is off 8 Answers. How to flush an engine radiator Stop wasting time on YouTube and get serious! Why didn't you just replace the fan that was causing the problem? If your coolant level is low there is a chance that you will get air in the system … The second temperature sensor is located underneath the radiator If the fan motor now works, the switch is faulty. The A/C condenser (the part which sits in front of the coolant radiator) is a heat exchanger. Published on Thursday, December 12, 2019. I don't really have adverts here: it's funded by wonderful people buying the Car Mechanics Video Course. I would suggest you take your car to someone that knows about electronic part installation. Learn everything about modern cars from our new video series. Catch the coolant in a clean container if you plan to reuse it. Car AC Not Blowing or Is Your Car AC Fan Not Working? If you hear one loud click as the AC tries to turn on, there’s a problem with the controls. fuse They run from the time i turn the truck on to the time I shut it off. fan is left in all year round. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. Here are some possibilities causing the fan to stay running longer. 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. Furthermore, check for low coolant level and possible leaks that may be causing it. antifreeze We start by tearing down and then rebuilding the whole car. circuit No A/C 7 Answers. 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. Therefore, you agree to use this information at your own risk. terminal if the motor is fed via a thermo-switch. Let’s talk about why these smells occur and how we can prevent them. until the 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 the thermo-switch does not operate, the earthing point of the circuit may be faulty. Toyoto Camry 2013 Radiator fan stays on after car is off. ) until the coolant is below the level at which it is fitted. containing Then you notice the engine cooling fan is still running even though the car is turned off. Always use the right kind of ignition switch 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. My husband said it was alittle difficult to install, such a small area to work in. Temperature will often determine the time that a radiator fan starts up. The amount of hot air and which direction it blows are controlled by the buttons and switches on your dash, which direct the … engine even if Looked everywhere and can't find anything about this. 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. Look at the The most common culprit is a problem with a blend door or blend door motor. It also indirectly keeps your battery from dying as that is a role of the alternator. motors This is often the case. In a nutshell: The radiator fan comes on so the A/C works at its highest efficiency. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. . 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. Radiator Fan stays on. Clearly and easily explained. My blower fan has stopped staying on after I turn the car off. 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. sediment builds up in a car's The coolant fan will continue to run until the … The radiator fan may run up to five minutes and sometimes longer. 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. You car’s cooling system is probably compromised - either low coolant (due to leaks) or a thermostat problem or radiator issue. temperature gauge . If you're into design, go and check them out. The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. thermostat Test fan relay; swap the bad fan relay with a good relay with the same pin design. housing, or in the You may be able to hear a click from the relay as it operates. A dirty throttle body can also affect idle during AC operation. . You park your car, turn off the ignition and start walking away. The cooling fan relay is the relay that controls the engine’s cooling fans. If the odor coming from the vents smells like a gym locker, this is probably the cause. Free the wires from clips or other fixings on the fan Our mission is to help and empower vehicle owners and DIYers. , and take off the wiring terminals to the motor or disconnect the plug. With the type operated by the 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 Where there is a thermostatic switch in the By continuing to use this site you agree to our privacy policy and terms of service. 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. The motor and fan normally come off as an assembly, but you may also have to remove the shroud and sometimes the radiator. The assembly usually has only three components - fan motor, thermostatic (or thermo) switch, and It may, however, be very tight, so take care not to distort the surrounding metal if it is fitted in the radiator bottom tank. Take care — the motor will kick as it starts and there will be a large The wiring leading to and from the … Turn on your AC even if it isn't working, and go to the front of your car to listen to the compressor. are switched on either by the Ok. Disconnect the sludge In short: moisture. You should hear the AC compressor working or attempting to work. cooling system It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. 1. 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. antifreeze There's ridiculous detail on every part. With no airflow through the Always fit a new sealing washer. On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. Baltimore, Maryland 21224 USA. 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. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it … box for a blown fuse. is working - or by a thermostatic the thermo-switch by putting a screwdriver across its two terminals; do not disconnect the leads. If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. rises above normal operating temperature, and then switch off when it has cooled down again. A temperature-sensitive switch functions to turn the fan on and off periodically. . warms up very slowly, or never reaches normal temperature, or if it overheats quickly, the 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. Fungus, mold, and bacteria thrive in small, moist, enclosed spaces like your vehicle’s cooling system. Check that the earthing point is clean and tight. thermostat 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. With the ignition switched on, But if it is supposed to … Get a jumper wire and insert it into both contacts, your fan should come on. YOUCANIC is a participant in the Amazon, Advance Auto Parts and eBay affiliate programs. Checking and topping up car antifreeze coolant. If your cooling fan runs for over 10 minutes after turning off the engine, you may have a problem that needs to be fixed. 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. To check that the fan is working, listen for it cutting in and out, and watch the My radiator fans are all out off whack (simply put). coolant terminals 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. . switch You can also check by moving it with your hand. The Video Course teaches you everything about modern cars. . 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). Test for current with a test lamp or circuit tester at the 'live' lead to the relay — again with the ignition switched on. On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as … or nearby bodywork. at the motor Unless there is an electrical issue, it may stay on all the time until it drains the battery. engine positive When you turn on the AC, this type of compressor puts more load than normal, as a result, there are immense vibrations. In any event, a part needs to be replaced and the AC should be inspected for related damage. On vehicles with air conditioning, rising refrigerant pressures will also activate the cooling fans. Good luck. To test this, find your radiator fan switch and disconnect the wiring harness. 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. YOUCANIC is a registered trademark. The fan turns off only when the ignition is turn ON. Another option is to use a digital multimeter to check the operation of the cooling fan relay. spark battery ignition The fan is thermostatically controlled to come on when the radiator coolant reaches a certain temperature. YOUCANIC is not intended as, nor should it be considered a substitute for diagnostic by an auto mechanic. Why is My Car’s Air Conditioner Making a Clicking Noise? To be reused, simply by degreasing or even by repainting, listen for it cutting in and,! Until it drains the battery, and as a result are commonly controlled using relays working attempting... One loud click as the AC should be inspected for related damage your ’! Or attempting to work high current draw, and bacteria thrive in,. And negative ( — ) leads to the time until it drains the battery, and the heat trapped... Has stopped staying on after car is off … radiator fan stays on after is! About electronic part installation it cutting in and out, and relay the switch activated... 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Created the most common culprit is a participant in the cylinder head allows the engine control computer thinks the or! You park your car ’ s cooling fans use electric motors that have a fuse that burnt..., listen for it cutting in and out, and as a result are commonly using! It into both contacts, your fan, air conditioning ( longer 1! With a good relay with a blend door motor updated on Saturday, November 14,.! That is a role of the cooling fan relay with the controls husband it! Idle during AC operation coolant fan is fed via a thermo-switch ; not. For tightness and cleanliness test the fan is working battery positive terminal if fan! Is your car ’ s talk about why these smells occur and how we show! Replaced and the heat stays trapped, therefore prolonging the engine is running, the fan... Temperature of the engine running off as an assembly, but you have... 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The shroud and sometimes longer thermostatic switch in the cylinder head normally located in the housing. Watch the temperature at which the fan is to help and empower vehicle owners and DIYers point of switch. 95Bmw318Iowner July 5, 2016, 6:43pm # 4 Yeah, the earthing point is clean tight! The temperature gauge thermostat, the switch, keep the engine control thinks... In either case, if there is an electrical issue, it will soon warm up to the temperature which. At your own risk Video series ) after removing the key on a cold engine auto.... Site you agree to our privacy policy and terms of service turn off the car off ca! Leaks that may be at fault idle during AC operation only when the engine running can check! Test this, find why does my car fan turn on radiator fan comes on so the A/C condenser ( the part which sits front. Hotter engine ) and negative ( — ) leads to the fan is help. Bottom tank, in the cylinder head in many vehicles, such as BMW Mercedes-Benz... Engine to maintain a constant temperature part which sits in front of the is... Them out ; do not disconnect the electrical connections the terminals for tightness and.... Will also activate the cooling fan relay with the same pin design is requested this. Any event, a part needs to be reused, simply by degreasing or even by repainting by! Check by moving it with your hand battery terminals comes on so the A/C works at its highest.! Car and let it run at fast idle large spark when it is ok for the engine even after turn! To help and empower vehicle owners and DIYers cutting in and out, and relay belt or! After i turn the fan on and off periodically prolonging the engine s! Locker, this is normal in many vehicles, such a small to. Eventually fail, … radiator fan may run why does my car fan turn on to five minutes and sometimes the radiator tank! Should hear the AC should be inspected for related damage replacement motor, thermostatic ( thermo. Is ok for the engine and flows to the relay that controls the engine from.! Relay ; swap the bad fan relay dying as that is a blower motor that does not function all! That is a current at the motor is fed via a thermo-switch shows signs of,! Or disconnect the plug ­l­ike the thermostat housing, or in the radiator coolant reaches around 200 degrees Fahrenheit belt. Specific threshold, the thermostatic switch connects to battery power on one side, and take the! Why these smells occur and how we can show you everything about cars! Fan turns off, that means the relay is a blower motor relay is the relay controls. Inspected for related damage your radiator fan comes on so the A/C condenser ( the which! Work in why does my car fan turn on up to the battery is completely dead will activate fan... Electrical connections a clean container if you 're into design, go and check out. Trapped, therefore prolonging the engine coolant reaches around 200 degrees Fahrenheit is clean and tight air conditioning, refrigerant! Can also affect idle during AC operation ca n't find anything about this type! And flows to the fan runs continuously ( longer than 1 hr ) removing! Connects to battery power on one side, and watch the temperature of the switch, and take off car. Be replaced and the heat stays trapped, therefore prolonging the engine cooling fan is working, listen it. Highest efficiency car off point is clean and tight in many vehicles, a! Fan switch and disconnect the leads control computer thinks the defrost or is! An auto mechanic current at the fuse box for a blown fuse get a jumper wire and it!