what i need to do to check the fan function.
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2001 BMW 325Ci Question: cooling fan not working.
Answer #1Chow July 09, 2010, 23:18Master
There is a 4 pin plug on the passengers side of the fan. Power and earth and 2 small wires with modulate the fan speed.
I am not aware of anyway to check it beside via BMW tester machine.
When the A/C is switched on fan speed one should be engaged within few seconds. Fan speed two should only come on when car is getting too hot