Reviews for GMC Sierra Denali years:
2004 GMC Sierra Denali Reviews and Owner Comments
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2004 GMC Sierra DenaliVisitor, Kapolei, HI, November 02, 2011 22:26The Auto Mode Air Conditioning system on the driver side is giving me some annoying problem. When I set the temperature, say 68 F and it start to blow cool A/C air and after some 10-15 minutes it change to very hot air. It will not change to cool breezy air even if you turn and change the temperature knob setting. I tried to turn it off first then turn it back on but still will not go back to cooler air temperature. I tried other A/C modes but it will not respond. The only way to reset this, I found out , was to turned off the ignition key, shutting down the engine then start the engine again. It is dangerous to do this while driving in the freeway. So either I have to exit and pull over to turn off and start the engine again to get some cool air or continue driving in the Hawaiian summer heat in the hot interior truck cabin. Is this a common problem? Does anybody out there experience this? The passenger side A/C is fine. I am thinking of putting a separate switch for the A/C so I can reset it without stopping the engine.