Question about 2005 Chevrolet Silverado 3500

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The control for ac /heater stoped working but all power is there

For the longest time only 1234 worked on knob #5 wouldnt work it would just shut off.

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Most cars have a resistor pack which controls he speed for the heater blower. I would suggest locating this first and ensuring you have voltage at the terminals. On some cars, this is part of the blower motor itself.

Posted on Dec 05, 2008


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I own a 2006 Pontiac Montana SV6, there is very little heat coming from the heater, a/c working fine, fan blowing full capacity. Could it be the thermostat.

probably the blend door not opening fully. Do you hear a clicking under the dash by passenger's feet? If not, try calibrating the system:
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  5. Rotate the Mode knob fully counterclockwise.
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