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rear a/c fan motor only runs at high speed

2.6K views 3 replies 4 participants last post by  madbrad  
#1 ·
Is there a relay that can be changed on the rear fan motor on a 2000 DGC ? The rear a/c only runs on high.

I appreciate your help.
 
#2 ·
The resistor block for the motor is bad if hte low speeds don't work. Unfortunately I think they are built in the motor for the rear blower so the whole thing needs to be replaced. I would just try a used one from the junkyard.

But I hope someone else confirms that the resistor is built in the blower or not.
 
#4 ·
I had a hard time just figuring out how to use it for the first while. Not to insult; you can ignore the following if you know:

With the dasboard rear fan controller on "RR" the roof fan controller is enabled. It has 3 speeds.
There are only 2 speeds on the dashboard rear fan controller. LOW is the click above "RR" and HIGH is the click above LOW that. Using either of the 2 speeds on the dashboard rear fan controller disables and overrides the roof rear fan controller. Hot comes from the vent near the 3rd row right passenger's ankle. Cold comes out of the roof vents. The temp is set by the driver's temp slider. Only full hot or full cold are available, nothing in between. Once the rear temp is set, then the fan turned on, the front temp(s) can be adjusted.

On RR do you lose speeds 1 AND 2?