RE: The cooling, she no longer works

[Aleksander Mierzwa <alex@matrix.com.pl>]

I'm not sure if you shorted the correct switch. There are in fact four
sensors in the vinicity of the upper coolant hose housing:
1) two with only one contact: these are temp sensor for the ECU and temp
switch for the ISV controller
2) one with two spade connectors at the back of the housing: this is the
thermoswitch for the after run fan. Shorting it should make the fan and
electric coolant pump run
3) a big one at the underside of the housing: it has 4 (early models) or
3 (late models) connectors and a big rubber boot. This is the multi
function temp sensor that controls the temp gauge and provides
"overheat" and "engine cold" signals to the ECU, auto check unit and AC
controller. Does not have any effect on the after run fan operation,
though.

Aleksander Mierzwa
Warsaw, Poland
mailto:alex@matrix.com.pl
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)

> -----Original Message-----
> From:	Bill Martin [SMTP:billfree@interlynx.net]
> Sent:	Friday, November 28, 1997 3:49 AM
> To:	quattro
> Subject:	The cooling, she no longer works
> 
> I returned home today after a long drive, discovered my cooling fan
> did not come on. Tried shorting out the thermo switch which has three
> contacts, not two as my  simple manual tells me, nothing happened, fan
> was suppose to start. I put 12 volt source to the fan and it came on.
> Any suggestions.
> !990 200 TQ
>  
> Regards Bill