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Old 07-07-2007, 01:12 PM   #2
RichardWolf
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Join Date: Jul 2007
Location: Manasas, Virginia
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Re: 90 Grand Marquis HVAC Issues

Me and my father spent about an hour more on it and came up with the conlusion that the heat valves are stuck open. If you cold start the engine and turn the AC on it is cold for a few seconds and then the air temp coming out varies between 75-100 degrees F. You can feel the cold air but it seems heat is alos on. Tapping on the valves does not reset them so i guess we are going to have to replace them.
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