previous noise in heater location, fan works fine on first 4 levels.
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2004 Chevrolet Silverado 1500 Question: heater fan goes off on high, what needs replaced ?
Answer #1Curt's Service Inc (12 Answers) , Oak Park, MI - (248) 430-4028Andy Massoll October 07, 2013, 12:45Enthusiast
Usually when the blower does not work on high it is a faulty blower switch. Though it is merely a guess, the better thing to do would be to inspect the power coming out of the switch and the blower resistor to see what the exact reason is. Somewhere there is a loss of voltage causing your problem. High speed sometimes has it's own circuit and protection. Feel free to stop by for assistance if needed.
-Curt's Service Team 248-545-0500