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Why does engine fan stay on after shutting car off and drains battery on 2003 cavalier?

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Because u have a bad fan sending unit that stays on...trace wire from fan to the block and thats the sender u need to replace (stuck on drains batt and stuck off car over heats so i guess u was lucky)

Posted on Nov 29, 2014

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I have a 2003 Chevy Cavalier that when I came home from work yesterday and shut the car off, the fan continued to run. I haven't noticed any other problems with the car. Any advice on what is ca


sometimes the fan can run for up to 5 minutes after engine shut off depending on coolant temp as long as the vehicle is not overheating and the fan turns off after a few minutes this is normal operation

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2003 Mitsubishi Galant 2.4L 4-cyl is having trouble holding a charge on the battery. Tests say battery and alternator is OK. I checked fuses and they were good. I can jump the car but after I drive it...


Most likely you have something draining the battery. Quick way to tell, disconnect the ground (negative) cable to the battery, let it sit for a few hours, then reconnect it and try to start it. If it starts OK, you know the battery is holding a charge, but something is draining it.
To drain it in just a few hours requires a serious draw, like headlights or the cooling fan. It is possible that your cooling fan (behind the radiator) is staying on all the time. Often they are controlled by a thermostat, and will run for a few minutes after you shut off the engine, but it should shut off within about five minutes. If it is still running after ten or more minutes, you have a bad fan thermostat or a bad fan relay. If that is not the problem, you will have to get someone with an ammeter to measure the current draw, and start pulling fuses until you find the culprit.

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Yes pull the cooling fan relay in the fuse panel. It might be bad.

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Usually after driving, your rad fan can continue to run for up to 2 minutes after shutting off the car. It can even start up on it's own if it detects that the temperature of the engine is too hot (say if it's over 50 degrees celcius). The fan running for these several minutes should be of no concern. If it's staying on and not turning off for 30 minutes, then that is of concern

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YOU NEED A NEW RELAY. THE ONE YOU HAVE IS STUCK IN THE OPEN POSITION SO IT WON'T SHUT OFF THE POWER.

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Electric fans runs after car is shut off, drains battery


Having the fan run on for a bit after the engine has stopped is not abnormal in itself, but 20 minutes sounds excessive.

If the fan does eventually shut off, I'd consider changing the thermoswitch (this is a sensor screwed into the radiator somewhere near the bottom, with a pair of wires connected to it - to change it, you'll need to drain the cooling system).

If the fan stays on continuously until the battery is completely flat, see what happens when you unplug the wires from the thermoswitch. If this stops the fan, you need to replace the thermoswitch. If it doesn't, then you need to examine the wiring associated with the switch and the fan, looking for damaged insulation.

A.

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