Mechanics

BLOWER MOTOR

2005 GMC Sierra

Heater problem
2005 GMC Sierra V8 Four Wheel Drive Automatic 79000 miles

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
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Rtheroys
May 24, 2010.



Check the relays, switch and resistor for speed control. It may be the resistor. All you need is a test light to test everything.

Hmac300
May 25, 2010.