Question about Chevrolet Silverado

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When running air conditioner,cannot get it to blow out the ports to cool the truck it always comes out defrosters, 2004 chevy silverado pick up.

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  • t_calkin Mar 22, 2009

    I have a 2004 Silverado 2500 HD Duramax with Dual Zone ATC. This solution will not work due to the fact that there is no Vacuum motors on this climate control system. It is all electronic... Electronic control head, wires, motors, actuators, etc. Occasionally it will change positions, but usually settles out at defrost. I pulled the control head out and any other easy access panels and found no apparent wiring damage. I believe the problem lies in the mode doors but I have no diagrams or info to confirm this.

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Whenb this happens you have most likely lost the vacum to the control and so the unit goes iunto defrost as a safety feature you may want to chk for vacum

Posted on Aug 16, 2008

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