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Climate control suddenly blows cold air with heat on
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01-05-2007, 07:35 PM
Adam in CO
Hummer Guru
Join Date: Dec 2002
Location: Anywhere you're not!
Posts: 5,006
Re: Climate control suddenly blows cold air with heat on
Radiator problem. Check the coolant level, for leaks, for radiator or hose blockage. No coolant means nothing flowing to heater core. There wouldn't be any codes.
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