Might want to chk. to see if its got a blower motor resister, i am not sure if there is one on yours but most do have them, and that is what makes the blower work and also regulates the speeds of the blower, you may be able to go on line to napa or auto zone and find out were its located, or your local chevy dealer can tell you.
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hOW COME WHEN YOU START YOU TRUCK AND YOU HAVE HEADED SEATS AND TRUCK IS SUPPOSE TO WARM UP ONLY WAY IS LEAVE FAN TURN UP, WHY WOULD YOU HAVE AUTO HEAT ANDAIR
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