Date: Sun, 26 Jan 2003 12:24:18 -0000
From: "Pidgeonpost" <>
Subject: Re: Saab 9000 fogging up

"Fannie Schapiro M.D. & Daniel Krill" <> wrote in message news:2nxY9.8564$ > My wife's 97 Aero is fogging up within 20 minutes of driving on these cold > Rochester mornings lately. The mechanics she uses (Schoen Place) have > replaced the heater core twice already, specifying that as the problem. Why > would the heater core cause the interior to fog up (and ice over, lately) on > the inside of all the windows? It seems to me that this is more of an issue > of recirculated air and not getting fresh, dry air from the outside to dry > out the interior. > > Also, for some reason, the manual says to increase the temperature to 70 if > the interior fogs up. Why would this work? It seems counterintuitive, since > on normal cars to defog you turn on the air conditioning. Since there is no > independent AC control in the 9000, the only thing to do is to change from > recirculate to fresh air, or turn the temperature DOWN to get the AC going. > > What's going on here? > > Thanks for any information. > > Dan > > I went through this with my '96 9000 2.3LPT. There was plenty of fogging but absolutely no sign of coolant loss, and none of the smells associated with heater matrix failure. My dealer immediately diagnosed the problem as a failure of the motor that controls the air circulation flap somewhere behind the dashboard. Must admit I doubted the diagnosis, and was reluctant to shell out 200-ish on a speculative repair. Eventually I couldn't face another foggy winter and booked the car in. Fixed the problem TOTALLY. On my car you can (just about) hear the motor adjust the flap when you just turn on the ignition, but don't start the engine. If you listen carefully you can hear a faint whine which I think may be the motor adjusting the flap. I don't recall hearing this noise before the repair was done, but now I listen for it. Sad or what.

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