E36 328i auxiliary fan problems

[Liam1288]

Hi guys!
I have an 1997 e36 328i convertible with the auxiliary fan not working.
I have done some fault finding and it came to a faulty switch but its still not working ill run through my tests i carried out...

Ok
1.so the fan is not siezed i can spin by hand
2. Relevant Fuses in engine bay fuse box are good
3. I checked both high and low speed relays that they click and checked if they have resistance... they don't so they are good.
4. Got power 12v to the high speed relay socket at terminal 30 jumped with 87a.
5. Jumping the switch harness with a wire produced nothing but relay clicks which to my understanding should've jumped the fan on but it did not budge.
6. Hmmm so next i thought id hook the fan up straight to a 12v supply and it WORKED! on both low and high...
7. So i tested the fan electrical wiring harness socket and i got no power reading on the multimeter until i jumped the fan switch harness again (to engage whichever relay and make a circuit) and GOT 12V!
So my conclusion was that by-passing the temperature switch to get 12v at the harness directly feeding the fan meant the awitch is at fault...

8. Replaced said sqitch and still nothing... hmmmm

Any help?


Pic below is of the new switch however does anyonw think replacing the switch below would help the problem?
Could it be something to do with the fan resistors? (Wouldn't think so if it worked supplied with a dirext 12v though)

Thanks guys

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[Liam1288]

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