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Discussion Starter #3
What is the FSU and where is it located? Fan seemed ot be operating fine on the way to the store. Didn't work on the return trip.
 

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It's in the heater duct next to the glovebox. Search here for more info. Very common failure.

Final stage resistor, or final stage unit.
 

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yea the final stage unit is a prob it drove me crazy ,a/c would cut out just when you need it most and then come on again when it was ready to. changed it (took 10 mins) and works perfect .
 

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Is this related to the AUX FAN RELAY fault code? I'll have to read the codes tomorrow but that is next on my list of to do's.
 

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I do not believe an FSU failure generates any fault code, as it is not related to engine operation, safety or emissions. At least I have never heard of such a thing. :dunno:
 

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Using the Bavarian Technic software this is what I'm getting:

MODULE
Regulating Heating & Air Conditioning e39 Module ID
Module PN: 06916641
Then all sorts of date and software build codes
FAULT CODES
10: Relay Auxiliary Fan

I am assuming the only aux fan we have is for the A/C, is that the FSU module people are talking about here or is there a fuse or "relay" in this loop?
 

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Discussion Starter #10
Thanks for the guidence! I just swapped the failed one with one that I removed from my other E39 and that did the trick. Found a new one on the net for $70.00. Just like a lady, once you figure out the first one, the rest are easy...
 
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