Question about 2003 GMC Sierra
It has a choice of 1 thru 5 , and it only works on the #5 speed.
Please let me know if it's the blower motor and is it easy to replace.
Check or have checked the blower motor resistor. These resistors will cause this problem. I would go this route first as these are relatively inexpensive and usually the problem.
Posted on Dec 14, 2008
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Posted on Jan 02, 2017
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