Question about GMC Denali

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I can turn the heater up to max , funning from the front controler and it doesn't get warm, just blows cold air. Then if I switch it to the rear controler, it still won't get warm, blows cold air?? Air conditioning works good, but no heat??

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Be sure and check the coolant level first, at the radiator after the engine has cooled

Posted on Mar 14, 2011

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