This is a common problem with the blower fan resistor. Find your blower fan motor. Follow the wires by the Firewall to a part mounted in the ductwork. It usually has 2 screwmounts and 1 wired plug.
For some reason, the part may respond by tapping it with a broom handle or icescraper handle. It may last for years after that. Or if you buy a new part, it may do the same thing for no apparent reason.
The position of this switch is often blocked by an engine heater line. The water will usually stay in the line if the engine is cold by vacuum retention and if you disconnect the electric plug and both mounting screws you can swap the parts with 1 hand while holding the loose end of the disconnected heater hose. You just have to have everything in place before removing the water hose. You can then reattach the water hose and reclamp it. Then work on the switch.
The higher end Lincoln dash units have a self-diagnostic Code which when programmed will tell which Climate control part is bad. This is a diferent Coding system than for the engine system. You would need to know the trigger Code and have a Legend of corresponding problems they match to.
But this feature could easily be used in a Service writeup area as it takes less than 5 minutes to run.
I hope my solution, especially the free one with the broom handle helps you.
http://technoanswers.blogspot.in/2012/04/how-to-remove-fan-clutch-on-2005-gmc.html
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This will help.
Thanks.
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