What would be the problem if your heat is not heating up the car but it blows cold air.
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2002 Mercury Sable Question: heating the car
Answer #1Bret Bodas from RepairPal Test Shop, October 19, 2009, 13:45Master
Verify that the engine is reaching operating temperature, if it isn't the thermostat may be stuck open. Here is some more info related to this issue: http://repairpal.com/i-have-no-heat-what-could-be-wrong