Date: Sat, 25 Jan 2003 14:42:06 GMT
From: "Fannie Schapiro M.D. & Daniel Krill" <>
Subject: Saab 9000 fogging up

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

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