Heater fan motor works but only the first three speeds?

2005 CHEVROLET SILVERADO
12,300 MILES • V8 • 2WD
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POP42
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Selector switch works but only turns fan motor on to the first three speeds. could it be the fan motor or the on dash switch?
Jul 23, 2014 at 11:24 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check the blower relay under hood high speed runs off of that. if it is good then have scanned for codes. switch with a like relay.
Jul 24, 2014 at 5:41 AM
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WRENCHTECH
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  • 20,761 POSTS
  • ASE Certified Mechanic
This truck does not have a replaceable relay. It is incorporated into the blower motor resister.
Jul 24, 2014 at 6:30 AM
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