T-stat change advice

Bernie Benz b.benz at charter.net
Tue Jul 22 12:45:02 EDT 2003

Hi Matt,

What does the VC show as the warm up temp profile?  And the VC must be
reading from the 3B ECU temp sensor on the back of the head, right?
Anyway, if a stuck open thermo, the warm up temp profile would be very slow
and never reach anywhere near 185F unless you were really pushing on a 100+
day.  So, I don't believe that is your problem.

So, what's wrong with 185F op temp within a spec of 185/205F?  DFI if IAB!!
And, unless you have previously calibrated the temp sensor and VC together,
your readiings can be off by 10F.

You are using the 7A thermo housing on your 3B, I assume?  You should be
able to reach the housing hold down bolts thru the 7A's plastic side duct,
where the housing's outlet pipe comes thru to connect to the lower rad hose.
Once you get the thermo housing loose, I don't know where you go from there
but, IMO, removing the IM won't help much.



> From: Matt twentyV <matt_20v at yahoo.com>
> Date: Tue, 22 Jul 2003 10:27:19 -0700 (PDT)
> To: 200q20v at audifans.com
> Subject: T-stat change advice
> Subject car is a '91 coupe quattro with a 3B engine.
> I want to replace the T-stat as the engine temps
> are a little low as read by VAG-COM block 000 (hovers
> in mid 180s vs. spec of 185-205) and radiator gets
> warm immediately after starting.
> Looking at the engine, I don't see how to get at
> it without taking off the intake manifold.  Is there
> a magic way to do this, or just bite the bullet and
> pull the IM?  The coupe engine bay is a little more
> cramped than the 200, the radiator is just a few
> inches from the IM.  If pulling the IM is the
> recommended course I can justify it better by also
> replacing the MFTS and after-run sensor.  Any other
> DFY-if-IAB-but-makes- sense-if- your-are-in-there
> items?
> TIA,
> Matt Rooke
> '91cq//20vt
> '00S4//30vtt
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