Cooling fans coming on when car is off :S
#1
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Hello everyone, i have a somewhat weird problem,, my car was sitting in the garage, it has been there for over 24 hours, and the cooling fans just came on and started running,,, For now i pulled the fuse.. but i have to figure out what the problem with this is :S
any help is appreciated. Thank you.
ps. its a 99 S500 (140)
Mike
any help is appreciated. Thank you.
ps. its a 99 S500 (140)
Mike
#5
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#6
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i understood that ur cooling fan is running not the blower motor. but the cooling fan relay's gets power via the ECU and the a/c control unit. i suppose it's not the ECU. the a/c unit goes bad plenty of times and then can give out power to the relay. but 1st of all,change the relay. maybe it just stuck together.
u can also unplug the wires at the temperature sensor and see there's resistance in both wires or not. if u could measure some on both wire then u need the a/c unit. when u unplug the temp. sensor then the fan starts to run. that's the way it suppose to be. the broken wire does the same thing.
u can also unplug the wires at the temperature sensor and see there's resistance in both wires or not. if u could measure some on both wire then u need the a/c unit. when u unplug the temp. sensor then the fan starts to run. that's the way it suppose to be. the broken wire does the same thing.
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dlmoore75
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