Expert: Sean Halliday - 6/23/2009

Question
QUESTION: My BMW 1997 740IL, the pusher fan is not working, it worked when it was hooked up outside the car. We are checking the fuses, do you have any ideas please????

ANSWER: What do you mean by pusher fan?

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QUESTION: The auxillary A/C fan in the very front, has no power, with jumper wire, motor runs on one wire 2 for resistors, motor does not run.

ANSWER: This fan will only come on when the a/c is engaged.The problem is possibly with the a/c system.Lack of coolant(gas)will shut down the a/c,does the a/c work at all?

---------- FOLLOW-UP ----------

QUESTION: Yes, the air conditioner worked for a couple minutes then it went hot. I don't understand why the fan has no power to it, something is stopping the fan from coming on. Do you think it would be a resistor?

Answer
As i have already said,the fan will not work if the a/c system is not working and as you tell me it runs warm,i am sure the gas is too low to start the system.This is a safety feature on most a/c systems and the low pressure sensor will prevent the a/c from coming on and hence the fan will not work either as it is all in the one circuit.The fan only works when the a/c is engaged.Have the a/c system repaired/serviced and that will cure the fan problem.