SPONSORED LINKS

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.
SPONSORED LINKS
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.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Saturday, January 3rd, 2009 AT 8:55 PM

Please login or register to post a reply.

Related Blower Fan Content

Blower Motor Replacement
VIDEO
Blower Motor Replacement
Instructional repair video
Blower Fan Motor Works on High Only
GUIDE
Blower Fan Motor Works on High Only
Does your blower fan work on the high speed setting only? This problem is a classic blower motor resistor problem which is common on vehicles that use manual fan speed ...
VIEW MORE

Sponsored links