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Q:

Heater blows cool air at low rpm. on 2004 Mercury Marauder

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Car guys on a local radio station suspect a head gasket.
(2) Answers
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The first thing I would check is the coolant level. It could just be low. Other causes could be a restricted heater core, low pressure from a worn water pump. The head gasket should be the last thing to check. If you want us to check this out just call and schedule an appointment (313-562-7022). I am sure we can diagnose it and give you the answer you need.
Larry
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