2005 GMC Sierra blower motor

2005 GMC SIERRA
79,000 MILES • V8 • 4WD • AUTOMATIC
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RTHEROYS
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  • 1 POST
When I turn on my heat or ac sometimes I can control the blower motor just fine other times and this seems to be more often now the blower motor will not increase in speed
May 24, 2010 at 5:54 PM
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HMAC300
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  • 48,601 POSTS
check the relays, switch and resistor for speed control. It may be the resistor. all you need is a test light to test everything.
May 25, 2010 at 5:00 PM