Question about 2003 Chevrolet Silverado 2500HD

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The fan motor for the heater will start on high when the key is off and the truck has been sitting for at least four or five hours, but with the key off if you move the heater speed control from off to high and back to off iy will shut off

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  • Charlie May 11, 2010

    Does this vehicle have manual air conditioning (Temperature lever simply goes from cool to warm) or automatic air conditioning (temperature allows you to choice a temperature by degree, like your home A/C)? Does it have rear A/C and heat? It sounds like the fan speed control resistor is shorting out intermittently or one of the fan motor relays is being engaged somehow.




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Check under the right side of the dash for possible melted connector to blower motor resistor. There is a service connector available for this if it is the problem.

Posted on Jun 22, 2009


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