Heat Loss

By sdjon
January 19, 2008 in Ask A GM Technician

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sdjon

Posted January 19, 2008

i have a 2004 gmc 2500 hd durmax when i start cold it is fine starts to warm up, but in about 10 minutes temp gauge drops, i lose heat, in bout 10 minutes heat goes up past 220 degrees,it coughs up coolant throgh overflow, then it goes to normal heat is fine, and is fine as long as i drive, also cools down if at adle long time.

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