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RossT
03/03/2008, 2:22PM
About: 2005 Chevrolet Silverado 2500HD 4 Dr STD Crew Cab LB HD
2005 2500HD air conditioner speed
When I set my air conditioner speed selection switch to 5 the HVAC system shuts off. It works fine at all setteings heat/AC on settings 1-4.
casper271
03/03/2008, 3:42PM
sounds like a "short" or the unit (AC) is not getting the signal. I haven't heard of this before, normally you lose the lower speeds first.
Daniel3018
05/25/2008, 7:43PM
On GM's, the most common cause of a lost HVAC fan speed is the blower motor resistor. Replace that, and it should work fine. If it goes bad again, the blower motor is pulling too many amps, and that would need to be replaced as well.
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