Re: Is this a computer trying to die? 2005, 2500
your heat normally runs full-tilt, full-time. The actuators for the heater box doors are having an issue. Shutting the truck down and restarting restarts them too, but you need to figure out if the actuators are going bad, or the controller. Do you have manual heater controls or climate control?
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2006 Sierra RCSB V6 5 Speed RWD.
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