When the heater is on and the truck is completely warmed up it just blows cold air. The temperature gauge starts getting hot and when I quickly accelerate the temp drops and the heater starts blowing warm hot air. It does good for a while, but then will go back to blowing cold air when I start slowing down and the temp gauge goes back up. If I repeat the quick accelerating it drops in temperature and starts blowing warm air again. Any clue as to what this could be? Please help!
By Patrick
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You may have an issue with the blend door actuator. You can read more here: www.silveradosierra.com/
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