Posted by fixerupper on January 03, 2010 at 14:49:52 from (207.177.13.178):
My son's 93 Cutlas Supreme that he just bought yesterday has real good heat out of the heater while sitting still but goes ice cold while driving.
This very same problem was posted by someone else a few days ago but I can't find it now. Seems like someone had mentioned the water pump impeller.
He can hear the air sounds changing under the dash when he moves the dash controls from one function to the other so some doors are moving under there but how well and which ones is unknown. Any quick ideas? First thing that comes to my mind is loose water pump impeller. I told him to try sitting there in park and revving the engine for awhile. That'll eliminate a stuck open vent door. The previous owner, who is a close friend said the heater worked fine the last time he drove it a couple of weeks ago. Thanks, Jim
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