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Why does the heater fan keep running with the key off.

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Problem with the sensor that controls it or a short circuit.

Posted on Nov 08, 2014

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Fan keeps running

Radiator fan? should run if the coolant is hot, key on or not.

If it runs when the coolant is at ambient temps, there's a problem.
If the interior heater / AC fan runs without the key, there's a problem.

Aug 16, 2016 | 2004 Saturn VUE

1 Answer

Fan keeps running

The cooling fan keeps running with the key on because the temperature switch on the bottom of the radiator is bad, the switch has an electrical connector with two wires on it, remove the connector, put a jumper wire between the two terminals if the fan stops replace the switch.
If you have the problem with the interior heater fan let me know, not sure which fan you mean.

Apr 16, 2014 | 1989 Toyota Camry

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Car fan keeps on going the car on Y.

First we need to know the make model and year.
Then we need to know if you mean the cooling fan on the radiator or the heater blower.
I assume you mean the fan runs with the key switch turned off which could be a stuck relay.

Dec 22, 2012 | Cars & Trucks

1 Answer

Our 94 Jeep Grand Cherokee's heater/air

My fan was stuck on low. I looked at the control module in the dash. Some of the contacts had over heated and melted part of the module. Our dealer said it was a $300 fix.

Jul 25, 2011 | 1994 Jeep Grand Cherokee

1 Answer

My engine fans wont go on when my engine gets too hot and the fans dont work when i put on my ac either

The AC should have its own individual fuse but then again it may be the same fuse the heater runs on. Does your heater work? It's best to check all of your fuses one at a time. Just pull one and remember where it goes and look at it to see if the wire is melted inside. If so get a new one. Some fuse boxes have spares in them already so check there first. The engine fans should be a seperate fuse so keep checking all fuses. After you have either fixed the two problems with the fuses your good to go but if not then lets start with the engine fans. First off what makes you think its getting to hot? It may have a high temperature thermostat that makes it seem a little warmer then you might think it should be. But if your worried then for the meantime for your cars sake then lets go under the hood. With the key in the on position go to the fan. Look along the side of the fan and find a wire that leads toward the engine. It may run up towards the top of the engine but keep going until you find a conection. Pull the connection apart. Make sure your shirt tail is not near the fan. Or your fingers for that matter. With the key on and the wire disconected then the fan should take off. This is a temporary fix. It will continue to run as long as the key is on. This will not hurt your motor and may Take a bit more time for the heater to warm up but it will keep the engine cool. let me know how it turns out. I like to know if I am waisting my time or actually helping others. Good Luck, The Raz

Apr 16, 2010 | 1995 Chevrolet Lumina

1 Answer

When I turn the key off the heater fan keepsRunning

may be sticking fan relay in fuse box or that area

Oct 22, 2009 | 1995 Buick Park Avenue

2 Answers

The heater fan wont shut off when the key is

check blower resistor it could be shorting out. try unpluging that and see if blower stops. hope the helps good luck.

Oct 20, 2009 | 1994 Buick LeSabre

1 Answer

Heater fan on 89 olds keeps running

replace the blower speed control module located near the blower motor

Feb 14, 2009 | 1989 Oldsmobile Delta 88

1 Answer

Dodge truck a/c and heat

The actual inside A/C or the A/C fan under the hood keeps running?

Nov 23, 2008 | 2001 Dodge Ram 1500 Truck 2WD

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