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Heat doesn't always work.

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Old 01-21-2012, 01:09 PM   #1 (permalink)
 
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The heat in my truck is only working when the truck is accelerating or driving. When I am sitting at an idle it blows out cold air. What could be the cause of this. This is after the engine is completely warmed up and everything.


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Old 01-21-2012, 01:16 PM   #2 (permalink)
 
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I had this happen on an old car when the water pump went out.


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Old 01-21-2012, 01:21 PM   #3 (permalink)
 
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check coolant level as well
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cold air at idle, heat issues, heat only when driving, water pump issues

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