Question about 2002 Jeep Grand Cherokee

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Cooling fan is staying on all the time. changed out sensor and fuse is ok. whats making it stay on?

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Stuck radiator fan relay?? try pulling the relay out while the engine is running, but be C A R E F U L

Posted on Nov 04, 2008


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Cooling fan stays on after turning off car

Taken from other previous solution (but it's right): the cooling fans are switched off and on by a relay. either this relay bad and staying on all the time, or something else is bad and telling it to stay on all the time. you might unplug the engine coolant temp sensor and see if the fans switch off. if they do you have a bad temp sensor, if they don't you probably have a bad relay. they will test either for you at most car parts stores. the relay will be in the underhood power distribution box, it plugs in like a fuse. disconnect the battery negative terminal before you start unplugging things from the power distribution box. hope that helps

Apr 02, 2014 | 1992 Chrysler New Yorker

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Cooling fan stays on all the time .on hi .not low change 3 time big relay (under coolant) change sensor on rad 97 w 88,000 kl she s clean

Hi. Please check the aircon high pressure switch. If faulty this will cause the fan to stay at hi speed.

Feb 13, 2014 | 1997 Volkswagen Golf

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Radiator cooling fans won't work

Just a thought, some makes and models, if you unplug the coolant temp sensor, the fan/s may run? I believe it to be a default setting incase the pcm doesn't see the signal from coolant temp sensor. Any applicable trouble codes? Do you want a wiring diagram for radiator fan?

Jan 27, 2018 | 2007 Pontiac Torrent AWD

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Cooling fan stays on will not shut off makes the car shift real hard where is the relay switch so i can check it thanks

cooling fan relay is in the fuse and relay box which sits behind the driver side headlight in the S series.
you know if your a/c is on, the fan runs constantly anyway? i do not think making the fan stay off is going to change anything about the way the car shifts.

Jul 21, 2011 | Saturn L300 Cars & Trucks

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Cooling fans stay's on while the car is running. c-230 sports sedan 2007

Is this the ac fan or cooling fan? For the cooling fan, check relay in the fuse box. The relay could be stuff and if the relay is ok then check the water sensor. The sensor should be on the radiator.

May 10, 2011 | 2007 Mercedes-Benz C230 Sedan

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My coolant fans wont spin. they work when tested with the battery. changed sensor and all fuses/relays are good. What could be making the fans not spin?

They only spin when your coolant system reaches a certain temperature. If you have a lower thermostat installed or a malfunctioning one that stays open and never lets your cooling system reach it's recommended operating temperature, then they will never spin. Your vehicle may be running too cool.

Feb 15, 2011 | 1999 Chevrolet Malibu

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The fans wont stay to cool the engine

Engine is supposed to be between 180 and 200 degrees, and the fans are supposed to go off under 200.
That is very close to boiling.
So what makes you think the fans should stay on?
Have you actually used a thermometer or does the gauge go too high?
If the fans ever go on, then we know the fans and relay work.
The next suspect would be the temperature sensor in the radiator.
But try turning on the AC. That should force the fans to stay on.

Aug 19, 2010 | 1995 Buick Park Avenue

1 Answer

Fans will not turn on therefore cause vehicle to overheat

cooling fan will not come on until about 230 degrees, if fans still do not work. check the fuses and relay. if ok then run a wire to fan from battery.on fan side connection, run a wire from battery positive to fan connection. run a wire from negative to ground connection.if fan will not come on it is either bad or the coolant temp, sensor is bad. because this sensor send info to pcm from various running conditions. it is very important that this sensor works. it can cause;
  • Extended crank time when the engine is cold
  • Poor fuel economy
  • Spark knock
  • Lack of engine power
  • Erratic and/or high idle
  • Engine cooling fan stays running all the time
  • Engine cooling fan fails to turn on
  • Engine overheating
  • Jun 20, 2010 | 1996 Nissan Sentra

    1 Answer

    Cooling fan stays on after turned off.

    Well there is a coolant temp sensor that controls when the fans come on and off, if this sensor goes out or gives false readings this will cause the fans to come on prematurely, not come on at all, or stay on as your problem is. Also there is a relay in the main fuse block that may also stick and cause them to stay engaged. hope this helps, if you need more help give me a shout and will be glad to help you out......

    Oct 23, 2009 | 1996 Mercury Sable

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