2001 RAM with A/C. I've replaced the resistor block, melted connector going to the resistor block and fan switch itself. I still just have one speed (high). What else could it be?

BTW when I had the control panel out I noticed a bunch of connectors that went to nothing. One was gray that looked like it could plug into the fan switch. I didn't try it because the black one was what was plugged into the switch. I should have tested it but decided.

Anyone know if this is the correct connector and if so why is there two identical connectors but different colors?

 

Mine only runs on the lower three settings but I have not dug into it yet. Once the weather warms I will try and figure it out.

Good luck and keep us informed on your progress.

 

That's odd you have the opposite problem. From the way I understand it, high speed means full power is going directly from the switch to the blower motor bypassing the resistor block.

I'm not real sure what else it could be on my van. Every post I've read on this problem with Chyrslers says to replace the resistor block in the heater box. But that did not fix it, nor did the switch.

I'm going to have to dig into the wiring diagram and see if there is something else between the fan switch and resistor block that might have gone bad but I can't find of what it might be. Unless the harness that goes to the resistor block is cut somewhere upstream that I am not seeing. I guess a simple test would be to test for power on each of the four wires with the switch in various positions just to make sure I'm getting power to the resistor block. Then work my way backwards.

 

OK, found a diagram of the blower fan system. I ASSumED that the resistor block was on the power side of the motor. But from this diagram it's actually on the ground side of the motor.

 

I hate reading wiring diagrams.

 

So if mine won't work on high, what are my options?

 

Check the black/tan wire at the control head for power with the ignition on. My guess, you won't get any.

 

I'll dig into it soon. Gotta get a little warmer and I'll pull the bezel and then the controller switch.