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Old 08-13-2011, 01:32 AM   #1
jooksingjai
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Engine fan not turning off

Hello,

I came back from a movie at the theatres and my car wouldn't start......the battery was dead. As I jump-started the car, I noticed/heard what sounded like a fan near the engine. This fan was on the whole time even though the car was turned off and the key wasn't even in the ignition.

Does anyone know what is wrong? I own a 2000 BMW 328Ci.

Much appreciated, thanks!
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Old 08-13-2011, 07:14 AM   #2
Ceeker
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Well, first off your fan drained the battery. 2nd it's your aux fan staying on which could pose a fire hazard since your wiring is going to get awfully hot. it might be the thermoswitch sending a false signal to the fan making it stay on.
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Old 08-13-2011, 09:45 AM   #3
BmW1819
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in other words u need a AUX fan dissconnect when u turn off the car and when u drive it plug it back in
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Old 08-13-2011, 12:05 PM   #4
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in other words u need a AUX fan dissconnect when u turn off the car and when u drive it plug it back in
the aux fan is working so it shouldn't be that, no? there has to be a switch to activate the fan when the motor gets above normal opp temperature. it should also cycle off when the temp drops. if it is staying on there is interruption to cut power to the fan. So, if by chance the thermoswitch is faulty it will make the fan think the motor is above normal temp and stay on. But it could be other things but I don't know how the circuitry is designed for the newer models
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 08-13-2011, 02:47 PM   #5
jooksingjai
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Yea I turned unplugged the aux fan and it turned off so it doesn't drain the battery out again.

I guess I'll just bring it to my machanic and have him check it out. Thanks for everyone's help though.
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Old 08-13-2011, 05:03 PM   #6
BmW1819
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nope the resistors short out in the fan assembly there has been cases where they burn up and some cars acutely burned down from this
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Old 08-14-2011, 08:06 PM   #7
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Wrong section. Try E46. They'll know more about it.
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Old 08-14-2011, 08:33 PM   #8
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nope the resistors short out in the fan assembly there has been cases where they burn up and some cars acutely burned down from this
so the fan in this model has the resistor built in? Would make sense; I've heard cases where the fan stayed on and burned the whole car down.
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 08-15-2011, 06:58 PM   #9
BmW1819
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yea hes in the wrong section this is a e46 fan where there is one fan for the engine/ac
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