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2004 Chevy Silverado 5.3 Heater Blows Cold Air?

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!

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By Patrick

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Gold Post Medal for All Time! 677 Posts
June 15, 20180 found this helpful

You may have an issue with the blend door actuator. You can read more here: www.silveradosierra.com/.../heater-blowing-cool-air-t18467.html

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