2005 GMC Sierra Im a curious mechanic

2005 GMC SIERRA
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BIGDOG030308
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Heater problem
2005 GMC Sierra V8 Four Wheel Drive Automatic
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When I go to turn on my a/c or heater nothing comes out. Nothing blows. All my fuses are good. What could be wrong with my truck?
Sep 14, 2008 at 6:48 AM
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2CARPRO JACK
  • ✓ASE Certified Mechanic
  • 11,533 POSTS
  • ASE Certified Mechanic
Could be the blower motor or maybe the fan speed resistor. Use a test light to see if you have power at the blower motor (under pass side of dash) If you do adn no blower, themotor is probably bad. If it doesnt, go to the resistor next to the motor and see if it is giving power out and if it has power in.
Sep 14, 2008 at 7:37 AM
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