Question about 2004 GMC Sierra 2500
The problem u are having is caused by the air temperature control bleed door actuator, U will need to replace the actuator and check the blend door for freedom of movement, the actuator is located inside the dash, the entire dash must be removed to replace it, about a 10-12 hour job, u will need a factory repair manual to have any chance of getting everything apart and back together again on the 1st try.
Posted on Jun 22, 2009
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Posted on Jan 02, 2017
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