[s-cars] running cold after t-stat change

[Cody Forbes]

I've got good news and bad. The good is that I've seen this before on  
two urS cars and on a CQ. The bad is that only one was fixed and even  
that was merely 'better' rather than truely fixed.

In one case, the one that eventually got better, the stat was changed  
three times, the third was a different brand without a weep hole. I  
tested all of them in heated water and they all opened properly at the  
right temperature. I don't recall how warm that car ended up running,  
other than it was winter and it would just barely provide enough heat  
to not need a heavy coat inside the car. Rick if you are reading  
please feel free to chime in.

Hey Besso did you ever fix this on the Coupe?

-Cody Forbes
Sent from my iPod

On Jul 1, 2009, at 12:49 AM, djdawson2 at aol.com wrote:

>
> I'm betting it all on defective t-stat.
>
> Dave
>
>
>
>
>
>
>
> -----Original Message-----
> From: Varon H. Fugman <vfugman at globaldialog.com>
> To: 's-car-list' <s-car-list at audifans.com>
> Sent: Tue, Jun 30, 2009 9:55 pm
> Subject: [s-cars] running cold after t-stat change
>
>
>
>
>
>
>
>
>
>
> Patient: 1995 urS6, new 87C thermostat, new thermostat housing, new  
> MFTS,
> new blue coolant.  Car now does not warm up driving on highway.   
> Temp gauge
> and climate control agree.  Today (with an chilly ambient temp of  
> 56F) it
> only warmed up to 59C (according to Area 51) after 10 miles of 65mph  
> highway
> driving.
>
>
>
> 1. New 87C thermostat was installed to replace the 80C thermostat  
> that had
> been installed at my last timing belt change.  I did test the new  
> one in a
> pan of water on the stove and it did open & close, although I did  
> not check
> the temperature at which it opened/closed.
>
>
>
> 2. MFTS replaced because I had never replaced it, so it seemed like  
> a good
> time while coolant was drained.
>
>
>
> 3. Thermostat housing was because of a leak. it appears to be made  
> of the
> same plastic as the heater-hose T fitting and after-run pump  
> housing.  The
> lip that seals against the t-stat o-ring was disintegrating and  
> allowing
> seepage.  The new housing has a difference from the original. it has  
> a pair
> of "fingers" inside which grab the thermostat.  They allow the  
> housing to
> hold the thermostat so both pieces can be installed on the engine  
> together,
> and they insure the thermostat is installed with the correct  
> orientation.
>
>
>
> I'm thinking either (a.) the new t-stat is defective and has stuck  
> open or
> (b.) the fingers on the new housing are somehow preventing the t- 
> stat from
> closing.
>
>
>
> Any other theories?  Anyone else installed a new thermostat housing  
> with
> "fingers"?
>
>
>
> Varon
>
> '95 urS6 on the road again :-)
>
>
>
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