[200q20v] Re: [s-cars] a/c update on 200q20v

Fred Munro munrof at sympatico.ca
Thu Jul 12 21:57:34 EDT 2001


There's a switch on the right side of the car just under the end of the
plastic plenum cover. It has a capillary tube which runs inside the evap
core and cycles the compressor off when the core gets too cold and back on
as the core heats up. I've had problems with this switch on both my Type 44
cars - the internal terminals get corroded and the clutch won't engage. You
can take it apart and clean it up - or you can pay the dealer $400 for a new

Fred Munro
'94 S4

----- Original Message -----
From: "Chris Covington" <malth at umich.edu>
To: <quattro at audifans.com>
Cc: <200q20v at audifans.com>; <s-car-list at yahoogroups.com>
Sent: Thursday, July 12, 2001 2:27 PM
Subject: [s-cars] a/c update on 200q20v

> Guys,
> Here's the update on my 200q20v.  It has been charged with Autofrost for a
> week, it has held the charge the entire time, and the A/C clutch does
> engage BUT the cooling works intermittently.  One day it will blow cold,
> one day cool, the next day warm, etc.  I'm not sure if the clutch
> engages on those instances during which it's not blowing cold, but it was
> engaged when it was blowing cold.  Does this help to identify what the
> problem could be?  People have suggested so far a multifunction switch,
> the compressor clutch, and to check belts, etc.  Belts are fine.
> Could it still be the compressor clutch?  And how can I determine whether
> or not the multifunction switch is the problem without buying another
> one?  Any other suggestions?
> thanks,
> Chris
> '91 200q20v
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