Question about 2003 GMC Sierra

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Cold Air with heater On

If I turn heater on 90 I get hot air but if I turn it to 89 or lower it will only blow cold air

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  • Anonymous Nov 23, 2008

    I have an 03 Sierra HD with the same problem. Set at 90 degress blows warm air. Go down one degree to 89 and it blows cold air. There is no arrow on the dial to reset it to, as previously suggested.

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It could be pushed onto the wrong spline remove the knob turn the spindel back to zero with your hand and then replace it back on with the arrow to zero.joe

Posted on Nov 21, 2008

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