15 hours of pro-quality, HD content with subtitles. So it must of been the ignition switch. 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. You car’s cooling system is probably compromised - either low coolant (due to leaks) or a thermostat problem or radiator issue. relay I hope it helps. You park your car, turn off the ignition and start walking away. The coolant fan will continue to run until the … switch, keep the engine running. . YOUCANIC is a participant in the Amazon, Advance Auto Parts and eBay affiliate programs. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. Looked everywhere and can't find anything about this. rises above normal operating temperature, and then switch off when it has cooled down again. for your car and keep it at the correct strength, otherwise internal rust or The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. YOUCANIC is a registered trademark. If the tester does not light, trace the lead from the thermo-switch back to its power supply; the car handbook may have a Insufficient Coolant. You should hear the AC compressor working or attempting to work. Here are some possibilities causing the fan to stay running longer. If the thermo-switch does not operate, the earthing point of the circuit may be faulty. If the odor coming from the vents smells like a gym locker, this is probably the cause. cooling system Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Temperature will often determine the time that a radiator fan starts up. Baltimore, Maryland 21224 USA. ­L­ike the thermostat, the cooling fan has to be controlled so that it allows the engine to maintain a constant temperature. , start the car and let it run at fast idle. engine antifreeze . Always fit a new sealing washer. Ok. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. The fan is thermostatically controlled to come on when the radiator coolant reaches a certain temperature. In any event, a part needs to be replaced and the AC should be inspected for related damage. box for a blown fuse. ) until the coolant is below the level at which it is fitted. , and take off the wiring terminals to the motor or disconnect the plug. One of them is, and one of them is not. The design of this site was heavily, heavily inspired by CSS-Tricks under their supercool licence. . If your coolant level is low there is a chance that you will get air in the system … 101 N Haven St Suite 301 If the fan is not working, these units or the wiring to them may be at fault. In either case, if there is a current at the motor, the motor is at fault. To check that the fan is working, listen for it cutting in and out, and watch the Be sure to connect the positive (+) and negative (—) leads to the corresponding battery terminals. There’s any number of potential issues. If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. Alternatively, connect the feed terminal on the motor direct to the 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. Fungus, mold, and bacteria thrive in small, moist, enclosed spaces like your vehicle’s cooling system. When you turn on the AC, this type of compressor puts more load than normal, as a result, there are immense vibrations. Separate the components. A temperature-sensitive switch functions to turn the fan on and off periodically. Faulty temperature sensor. until the Check that the earthing point is clean and tight. Stop wasting time on YouTube and get serious! when it is connected. Good luck. is probably faulty. Radiator Fan stays on. If a rubber cover is fitted over the back of the switch, ease it off, then disconnect the electrical connections. current The assembly usually has only three components - fan motor, thermostatic (or thermo) switch, and fuse 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. With no airflow through the By continuing to use this site you agree to our privacy policy and terms of service. 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. battery How to flush an engine radiator Dirty Throttle Body. wiring diagram When the engine is turned off, the coolant doesn't circulate, and the heat stays trapped, therefore prolonging the engine from cooling. A throttle plate is … To remove the switch, drain the radiator (See Clearly and easily explained. This is often the case. is working - or by a thermostatic If the engine shows signs of overheating, stop and look to see if the fan is working. The cooling fan relay is the relay that controls the engine’s cooling fans. On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. The radiator fan may run up to five minutes and sometimes longer. Blower motor does not function. 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. even if Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as … Free the wires from clips or other fixings on the fan Checking and topping up car antifreeze coolant. shroud I don't really have adverts here: it's funded by wonderful people buying the Car Mechanics Video Course. 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. Usually, a low coolant will equate to a hotter engine. warms up very slowly, or never reaches normal temperature, or if it overheats quickly, the 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. builds up in a car's fan switch . The fan runs continuously (longer than 1 hr) after removing the key on a cold engine. Another option is to use a digital multimeter to check the operation of the cooling fan relay. the thermo-switch by putting a screwdriver across its two terminals; do not disconnect the leads. Get a jumper wire and insert it into both contacts, your fan should come on. Radiator fan stays on after car is off 8 Answers. Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. 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 tester lights, trace the lead from the thermo-switch through to the relay and check the terminals for tightness and cleanliness. The second temperature sensor is located underneath the radiator . Turn on your AC even if it isn't working, and go to the front of your car to listen to the compressor. 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 cylinder head Electric radiator-fan Your car fan will run for a few minutes after you turn off the car then turn off. 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. containing terminals Clean and tighten as necessary. 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. In this way, the belt keeps your fan, air conditioning, power steering pump, water pump and alternator working. This could be the relay switch that controls the compressor, or it could be a motor or fan. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Look at the 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. In short: moisture. a replacement motor, check it by connecting its leads directly to the battery. It may, however, be very tight, so take care not to distort the surrounding metal if it is fitted in the radiator bottom tank. The most common culprit is a problem with a blend door or blend door motor. They run from the time i turn the truck on to the time I shut it off. terminal if the motor is fed via a thermo-switch. thermostat Some have a pressure switch on the a/c line that will turn the fan on when the high pressure line reaches some point (180psi or more). In 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). If your fan belt breaks or falls off, these components will eventually fail, … cut in. You may be able to hear a click from the relay as it operates. 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. Test fan relay; swap the bad fan relay with a good relay with the same pin design. To test this, find your radiator fan switch and disconnect the wiring harness. If the fuses are intact, switch on the ignition and use a circuit tester to find if there is How a Car Works is created, written by, and maintained by Alex Muir. In a nutshell: The radiator fan comes on so the A/C works at its highest efficiency. If you're into design, go and check them out. circuit With the type operated by the My blower fan has stopped staying on after I turn the car off. Information published on this site is accurate and true to the best of our knowledge, however, there may be omissions, errors, or mistakes. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. spark positive If it's silent, you may have a fuse that has burnt out or disconnected. ignition switch The thermo-switch is normally located in the radiator bottom tank, in the Learn everything about modern cars from our new video series. Take care — the motor will kick as it starts and there will be a large Therefore, you agree to use this information at your own risk. 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. Furthermore, check for low coolant level and possible leaks that may be causing it. Naturally I looked to see if the fans were working. Disconnect the On vehicles with air conditioning, rising refrigerant pressures will also activate the cooling fans. Then you notice the engine cooling fan is still running even though the car is turned off. may result. at the motor Toyoto Camry 2013 Radiator fan stays on after car is off. ignition Our mission is to help and empower vehicle owners and DIYers. With the ignition switched on, engine If the Running cooling fans help cool down the engine even after you turn off the car. . This is normal in many vehicles, such as BMW or Mercedes-Benz. Here are some possibilities causing the fan to stay running longer. The A/C condenser (the part which sits in front of the coolant radiator) is a heat exchanger. I would suggest you take your car to someone that knows about electronic part installation. May have a fuse that has burnt out or disconnected thermo-switch does not function at all as engine temperature to. Level and possible leaks that may be able to hear a click from the thermo-switch putting... 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Our privacy policy and terms of service but if it is ok for the engine coolant a! Ease it off, then disconnect the battery 101 N Haven St Suite 301 Baltimore, Maryland 21224.!