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1999 GMC fan not blowing right.

Tiny
TSTUCKE
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 142,000 MILES
I recently put a heater resister switch in my gmc sierra 99. AND I HAD SPEEDS 1 THROUGH 4 and the day after it wouldn't blow anything now all of a sudden setting five will on work. What could be the problem now.
Thursday, December 16th, 2010 AT 9:40 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,777 POSTS
Based on the problem described, you blew out another blower motor resister. The most likely cause is a bad blower motor. If the blower motor is drawing too many amps, it will fry the resister and you will end up with high speed only.
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Thursday, January 13th, 2011 AT 8:29 PM

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