[s-cars] Electric Fan not working....

[Peter Golledge]

Jim,

On the earlier Audi AC setup (5K/100/200) once the Multifunction sensor 
overtemp trips the AC is disabled to avoid overheat.  This sensor is not 
what is used to drive the dash temp gauge so things look "normal".  I 
would imagine they kept the same setup for the later cars, there should 
be some guidance on this site I believe:

http://www.12v.org/maintenance/index.php?section=tr&ss=hvac

I did run the issue with the spade connector behind the headlight 
killing my fan., if you trace the wiring back from the electric fan to 
the drivers side you will run into it buried deep under the hoses, hard 
to spot.  I'd start with that and measure the voltage while you are in 
there... no volts means the problem is upstream.

Testing relays is relatively simple, energize the coil with 12V and 
measure resistance across the normally open contacts (should be very 
low), there are some good sources in the net for testing Bosch relays.

Cheers

On 5/13/2013 12:07 PM, Jim Fleischer wrote:
> Okay guys,
>
> I've done a bunch of research on the archives and on Quattroworld and am still kinda confused as to where to start on this......
>
> To recap......coming home last night my Coolant light started flshing......topped off reservoir with coolant and monitored temps on the way home, and kept the heat on just in case.  Light continued to flash, checked 25A blade fuse left side of dash (it's fine) and tried to get fan to work by putting A/C on (A/C has worked fine in the past.)  Fan does not come on at all.  Drove 15 miles on country road home, oil and coolant temps at or below normal on way home.
>
> Question I have is.....will any of the coolant sensors malfunctioning keep the fan from coming on with the A/C on, or should I only be looking at fuses/relays/fan itself?  Without a bin full of relays, etc, how does one test a relay?  I've heard of a "big ass fuse" by passenger kick panel, not sure which one this is.  Also there was a post regarding a blue spade connector behind the drivers headlight.....any help?  Also, any tips on getting 12v of power directly to the fan to test it?  I'm not great with electrical and don't want to short something out.....
>
> Thanks all......seems like after around 100K miles of relatively trouble free driving, I'm encountering a bunch of age/miles related BS!
>
> Best regards,
>
> Jim Fleischer
> '95 urS6 avant mit 155K
> _______________________________________________
> S-CAR-List mailing list
> http://audifans.com/mailman/listinfo/s-car-list
> http://www.audifans.com/kb/List_information
>
>