1987 Auxiliary fan Fuse #3 keeps blowing out

[slippery]

I have a 1987 that all of a sudden started running hot when stopped. I traced it to a non running aux fan, and when I jumped the wires at the radiator switch it came to life but it was quite noisy.

I ordered a new fan from ECS, and swapped it and then found the #3 fuse to be blown. I replaced the fuse thinking that the old fan bearings were causing high amp draw and the fuse blew up in a second after turning the car on.

I am not very good with electrical systems, and I assume this is caused by a short somewhere. Can anyway help me or point me in the right direction in order to figure this out? I have a test light and also a voltmeter.

Thank you.

[tomstin]

First, find your wiring diagram here: http://wedophones.com/Manuals/BMW/

(on my 85) In the Auxiliary Fan page, Fuse 3 is between the K1 Normal Speed Relay and the Normal Speed Blower Resister (mounted on a bracket in front of the fan). My guess is that resister is shorted or the wiring is messed up as the new fan should not blow a 15 amp fuse.

[slippery]

Thanks for the reply.

I do have the wiring diagram but I had no idea where to start.

The new fan came with a new resistor, but I will remove the grill and see what I find.