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1999 GMC Sierra Heater fan & 4 wheel high/low shifting

Tiny
ROB PLANCE
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 162,000 MILES
The heater defrost fan motor works intermitiately.
Also it appears to quite functioning when the transmission refuses to shift into 4 wheel drive (high or low). The indicator light shows it is trying to shift but never does shift into 4 wheel. The transmission appears to function fine.
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Tuesday, December 23rd, 2008 AT 2:43 PM

1 Reply

Tiny
JEN6238
  • MEMBER
  • 9 POSTS
First, when my heater worked intermittent it was the plug into the blower motor (remove glove box) a short trip to the junkyard and I even matched the wire colors snip, snip and a little solder.
Second 4wd is usually the ENCODER MOTOR in your situ again junkyard if your inclined. Practice removal at the yard if you need to.
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Saturday, January 3rd, 2009 AT 8:55 PM

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