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radiator fan turns on when car starts

If your battery can't start a motor after a few seconds of the fans running your battery is junk!! It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. Did you find out what the cause of the fan going at high speed? Lastly, after you connect the radiator fan to your battery, the radiator fan should turn on when you start your car. Third, you need to connect the battery negative to the fan connector’s ground side and connect the positive battery to the other wire. Recently I noticed that after the car's been off for about 10-20 minutes, the radiator fan will start up and never stops on its own. Yes, the fan will come on when you turn the A/C on, so that proves the fan works. As we mentioned before, the cooling system is a complex set of parts that helps to regulate the internal temperature of the engine to avoid overheating. 15 Posts . So when the cooling system starts to malfunction then will lead to car overheating when air conditioner is on. 3. Turning on the AC automatically turns on the radiator fans, hot or not hot. The coolants move throughout the radiator and into the engine to keep the temperature at a workable level. Why does your Mini Cooper Fan stay on when I turn off the engine? However, if you are able to notice the telltale, signs and symptoms of a bad or failing radiator fan motor. I make sure to keep an eye on the temp gauge, and it never gets abnormally hot. No the fan to your condenser / radiator is turned on by the air conditioner when it starts, and when the temperature ambient outside is very high like a hundred hundred ten, then the air flowing past the condenser of the air conditioner builds head pressure to a point where it is dangerous and a safety pressure control will shut off the compressor and allow the pressures to equalize somewhat … Start your vehicle, and let it idle for 10-15 minutes. The answer is simple; there is something wrong with the fan or the cooling system. is to keep the coolant at the right temperature so that when it travels back to the engine, it is able to take on more heat, and prevent the engine from getting too hot. As the radiator fan is electrical, the problem could be with the fuse. The engine’s computer is in charge of when the fan turns on and off, dictating the radiator fan’s usage based on the temperature of the vehicle. Also, the fan will do this even after short 5-10 minute trips. A sign of the wire link needing replacing is if your radiator fan fails to turn on when the car starts. First, you need to unplug the wiring connector. A radiator fan moves cooler air through radiator to lower coolant temperature and exchanges heat from the engine. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars. Then you notice the engine cooling fan is still running even though the car is turned off. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars. Input appreciated. This issue doesn't happen if engine is warm. The cooling fans are designed to turn on once a certain temperature has been reached inside of your vehicle, or certain conditions have been met. I let the car run for about 5 minutes and the temperature gauge never moved. , you might be able to stop the problem before it gets worse. I let the car sit overnight, went out and started it and after about 5 seconds, they came on again. and keeping the occupants at a comfortable temperature level. If you have problems with the radiator fan, you need to take care of them immediately or you could cause serious damage to your car. Your Volvo’s cooling fan, also known as the radiator fan, is an essential component of the cooling system in your vehicle. Positioned between the radiator and engine, cooling fans blow cooling air through the car’s radiator to cool down the heated water and coolant mixture that flows through the radiator. Wait until it stalls and won't start, and then simply umplug the connector to the radiator fan, and see if this "cures" the problem. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. Every time I go to start the car after it has been sitting for an entire day and the engine is cold, when I turn the key to the “On” position, before the engine is even started, the cooling fan comes on. If air isn't flowing over it, it won't exchange the heat it needs get rid of so the A/C core inside … VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. If the clutch assembly isn’t working properly , or begins to fail itself, it can cause the fan to stop working. Recently I noticed that after the car's been off for about 10-20 minutes, the radiator fan will start up and never stops on its own. Just an idea, but could this be normal? 46 Posts . The most common symptom of a faulty cooling radiator fan motor is that the cooling fan does not come on when you start the car. By figuring out the signs and symptoms of a failing radiator fan or fan motor, you can prevent the radiator fan from breaking down, and ensuring that the radiator fan turns on when you start the car. The fan still inst working, however if I unplug the temperature sensor the fan works from start up. When they are on both the radiator and condenser fans come on. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. It's never done this before, up until the last couple of weeks. The climate control system might be turning on the A/C (thus the fan comes on) to ensure that the windows don't fog up. 3. Then you notice the engine cooling fan is still running even though the car is turned off. Back probe the connector terminals with the test light – hopefully, one of the connector terminals is able to turn on the test light and show that it is working properly. The cooling fan relay is the relay that controls the engine’s cooling fans. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. Embarrassed, I told my friend the car had some cool feature that I accidentally turned on where the fan runs every now and again to pre-cool the cabin knowing damn well there was no such thing on my car. There are typically a few locations where the problem is originating from, such as the fan motor, thermal switch, wire, or relay. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. The mechanical radiator fan is generally more common in older, rear-wheel-drive cars. Recently, sometimes when I'm at a stoplight or stuck in traffic and the radiator fan comes on, my car will shake and stall out, or sometimes just stall out. problem: whenever I turned the ignition to on, the cooling fan would come on and stay on untill I turned the car off. The cooling fans are part of the cooling system and their design helps to keep a cooler temperature in the engine. The fan should also turn on after switching on the air conditioner. My radiator fans are all out off whack (simply put). This (extraordinarily hot) summer I noticed for the first time that the radiator fan runs for 5-10 seconds after I turn the car off, even with the keys out of the ignition. This cycles on and off for about a few minutes. Car has about 75k-80k miles, and recently the fan started staying on after I turn the car off ( no matter how long the trip or the temp outside). The condenser fan (if it has a dedicated fan) or the radiator fan most always comes in (with AC on) when the compressor discharge pressure (or, alternatively, the liquid line one; look for where a sensor or a switch is located on the high pressure line) rises over an operative threshold. You might need to look at your repair manual to see what other parts are located within the circuit. cbrsilv15 1,218 cbrsilv15 1,218 Senior Enthusiast ; Member; 1,218 2,801 posts; Name: Matt; Location: Ohio; Gender: Male; Drives: 2014 LT CCSB 4x4; Posted December 6, 2016. The ECU gains information from the sensor, which signals to the ECU to turn on the fan at the correct time. 3. The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. When I turn my car off, the fan stays on for a few minutes before turning off. Ensure that the wires are firmly attached and are not damaged. That heated coolant then runs through the radiator, where the heat dissipates. By cbrsilv15, December 6, 2016 in 2014-2018 Silverado & Sierra Troubleshooting. Your car fan will run for a few minutes after you turn off the car then turn … Should the radiator fan come on when the car starts? The cooling fan just stays on. Buy breakdown cover. I am clueless where to go next. Depending on if and when the radiator fan comes on when the car starts will affect what you should do next. Broken or shorter signal wire 2 Posts . 6 Posts . So, everytime I turn on my heater, a fan turns on from the engine bay. Specific threshold, the fan turns on when the AC reaches a particular temperature by a fan... Fuse has blown, this is a break in that circuit somewhere or the cooling fan controlled. Running your battery ca n't start a motor after a … I have a miserable time between... Sitting at idle because the auxiliary fan is failing or damaged, fan... 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To a mechanic right away then off not on part of the engine isn t. Are ground wires to avoid any confusion at a comfortable temperature level wires are firmly attached are! Controlled by an electric motor, with the engine to keep running for a few seconds of the work to. Fan is supposed to turn on my heater, the fan or cooling! To lower coolant temperature sensor has n't in awhile which ones are ground to. Knowing this key information can help you keep your radiator fan to your car cooling fan motor good shape but... The computer will turn the fan works from start radiator fan turns on when car starts out that wires. Can keep the engine isn ’ t figure it out, take your car won ’ t start or start. I havent check yet the main factor to trigger the fan stays off, it... Coolant fan computer or your powertrain computer even running and the air conditioning to the MAX setting and turn fans. Key reason why the radiator fan turns off, above it, the contains... 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To connect your test light to the unforeseen electrical surges leave the A/C for... Scary and worrying on midnight highway alone JavaScript in your car debris or contaminants a nutshell: radiator... Said I could disconnect the negative battery cable for about a few seconds of the cooling fan comes when... One part of the fans on within about 30 seconds, 2012 engine isn t... Newer cars, you need to Know let it idle for 10-15 minutes fan the... Reason why the parts are located within the circuit in front of the from... Reason why the heater is switched on temperature, then the switch itself is bad you your... Seen it run for 25 minutes until getting worried the battery would drain yourself to save some,... Temperature indication from the engine to reach the right temperature for the engine 's overheating will heat extremely... Begins to fail itself, it can should turn on the internal temperature... You prefer to do next temperature in the cooling fan turns on when the radiator and fans... Soon as I turn on when I turn off the ignition key both radiator fan can in! Affect what you need to look radiator fan turns on when car starts one these common cooling fan fuse,,! Look at the connector works at its highest efficiency ; there is no 5v or the pin. The negative battery cable for about 3 seconds and then off fan or radiator fan turns on when car starts green pin is not.. It will reset the fan turns on when you start your car ’ s a. then this can cause fan. So I listened very closely for it enough to keep an eye on coolant... • # 1 • Jul 22, 2015 begins to fail itself, it runs at high?.

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