Check your coolant level. I had a bad problem with that and found out I had a small leak that would eventually drain the coolant to a level that would make the heater blow like A/C. The leak was almost undetectable because when the truck was cool it wouldn't leak but when it was hot it would leak and burn off immediately. Very frustrating.
2002 suburban 2500, NO HEAT!!!!
It's funny because the rear air blows hot air all day long but the front does not. I thought maybe it was the radiator therostat but my temp is 195 degrees and holding steady. Maybe the heater core?
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