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Heater fan motor works but only the first three speeds?

Tiny
POP42
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • V8
  • 2WD
  • 12,300 MILES
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?
Wednesday, July 23rd, 2014 AT 11:24 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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.
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Thursday, July 24th, 2014 AT 5:41 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
This truck does not have a replaceable relay. It is incorporated into the blower motor resister.
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Thursday, July 24th, 2014 AT 6:30 AM

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