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You will need to access both the speed resistor and climate controls for the rear blower motor. Finding the source will not be terrible. Since your symptoms are "Won't turn off and can not change fan speed". There is a short in the high speed ground wire. Unplug the resistor. Did the blower shut off? If not the resistor is ok. Unplug the auxiliary controller then the main controller if there was no change. If unplugging the controllers does not affect the blower then the issue is a shorted ground wire. The blower gets 12 volts from the fuse box and then through a relay. The ground is established through the speed resistor and the climate controls. Any questions please write back.
SOURCE: Front air condition does not blow cold. Rear air condition does
sounds like a damper door in the front not working properly, these are actuated by the front temp control, the door is operated by either a manual cable, and electric actuator, or vacuum. I hope this helps you zero in on your problem. Merry Christmas
SOURCE: Front heat does not work, rear heat does?
I'm just a regular diy'er, no training. Had same problem, 2001 Suburban, front blew cool air when heating, rear heat warmed up nicely. After reading other posts on other boards, took off the the heater hose clamps (make sure you remember which is which) at the firewall. With low pressure garden hose flushed left inlet/outlet first till I got good flow, then the right side, and back to left. Reattached hoses, started and tested. Heat blows just fine. I can't think of anything that could be damaged by this, but check with someone who know something first before trying it on your vehicle, but it worked for me. So far so good.
Testimonial: "Tried this simple solution and it worked perfectly. Who knows how much repair money I saved, thank you."
SOURCE: The front passenger side window on my 1997 Nissan
Sound like a window switch.
If you didn't hear any mechanical noises from window before it happened , most likly - switch.If noises were present , might be window regulator or a motor.
SOURCE: 1996 nissan pathfinder driver side window won't go up and down
does it click or grind when pushing window button if so the window lift track may need replaced, if there are no sounds then disconnect the wires from the lift motor and with the ignition on so power is sent to switch, push button and check wires to 12 volts dc. If no power I would replace the driver side switch after checking the wires for defects. If there is power then I would re-install wires to motor after turning off key and try button again with power on. replace motor if it doesn't work.
SOURCE: 2003 Chevy Trailblazer - Rear Heat/AC Controls Don't Work
It is the rear heat module that needs to be replaced. I know where it is but cannot seem to get instruction on how to put it in.
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