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I went through a whole winter with out any heat. Brrrr!!!! I had the car in multiple times for repair at the GM dealership and they could never fix it. FInally, I ordered the service manual and started researching it myself. I found that there is a device under the dash that is a programmer for the heating system. It also controls a box through air tubes and electronics to open and close a door that mixes outside air with the heated air to control interior temperature. This box was defective and only selected fresh outside air. So up here in the great white North, it was a real problem. I bought a replacemnt at the wreckers for about $50 and it has been working fine ever since.

Same car, 91 Fleetwood FWD.
 
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