Date: Thu, 25 Jul 2002 20:32:29 -0400 From: "KGee" <greenstingnopsam.com> Subject: Re: AC Question, 97, 900S
There is an updated electronic version of the anti-ice thermostat which once replaced seems to work best. It is smaller and not cumbersome to install once you have removed the old one. "Jim Moore" <jmoore3nopsamhlink.net> wrote in message news:Vp009.6233$Ky3.356967nopsamread2.prod.itd.earthlink.net... > > "Harry Feinberg" <modern_1nopsametcom.com> wrote in message > news:ahnu6r$aku$1nopsam.atl.mindspring.net... > > I have 1997 900S, the AC works properly most of the time. As a preface I > > must say that I've had perpetual problems w/ the AC since day one. Anyway, > > here's the scenario, I'm driving along w/ the AC on & cabin blower in pos. > > 1, 2, or 3, or 4. I will notice a constrictiion and a whirling noise (like > > putting a piece of cardboard n front of a fan), the airflow comming out of > > the vents is now almost nil. I then turn the AC compressor off, and wait > > 30-60 secounds. Like magic the constriction goes away, I turn the AC back > > on, until it happens again. Typicaly a few minutes later. Same process > seems > > to revive it. This behavior tends to occur after highway driving for more > > than 45 minutes. > > > > What do you folks think, is there some sort of vacuum leak I can check? Is > a > > solenoid closing prematurely? > > Are there other aspects ofthe motor that might influeence behavior like > > this, any possiblity that a vacuum line might be mis-routed. Any advice is > > welcome. Thanks in advance. > > > > Harry > > Guilford, CT > > > Sounds like the evaporator is icing up. Possibly a faulty icing switch. > This is essentialy a "pre-set" thermostat mounted on the r.h. end of the > evaporator. > They are actually adjustable, by turning a small screw on the switch, > although I'm sure the folks at Saab > don't recommend that. On my 1995 900S (manual a/c), I've adjusted mine > slightly lower to allow > the compressor to run longer due to what I consider a marginala/c system > overall. > If this has always been an issue with your car, you might be able to adjust > this thermoswitch > to cut-out at a slightly higher temp. If this condition came about suddenly, > I would suspect the switch has failed. > This switch can be accessed by removing the plastic cover from the r.h. end > of the evaporator housing, after > removing the glovebox. It is a somewhat delicate procedure; take it to your > mechanic if your not > comfortable with doing it. > > Jim > Groveland, MA > >
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