1999 gmc fan not blowing right....

1999 GMC SIERRA
142,000 MILES • V8 • 4WD • AUTOMATIC
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TSTUCKE
  • MEMBER
  • 1 POST
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.
Dec 16, 2010 at 1:40 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 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.
Jan 13, 2011 at 12:29 PM
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