Seems like position 2 of 4 on my fan speed control is not working any more. When I put it in that position it behaves like it was turned to off.


I assume that the control is the issue, but anyone know for sure if there is a possibility of the issue being at the fan instead of the controls?

 

There are resistors that control the blower speed. You probably have an open in one of the resistors. If the other speeds work ok, then it's not the blower. I'll have to look at the 09 wiring on my laptop (XP mode). Looking at the 2010 diagrams, they show a RESISTOR-BLOWER MOTOR - FRONT. I'm sure it's the same for the '09 but maybe the wire colors may have changed.

go here

https://techauthorityonlinedemo.extr...ew/classic.htm

Click on HVAC SYSTEM- ATC and click on the box depicting the module and you'll get four choices. Click on the SHOW LOCATION VIEW for the location of the component. It is right by the blower motor itself. I'll look at the '09 later and if it's different, I'll edit this post.

 

just looked at the '9 wiring and it is the same as the '10. I also looked at my truck and the resistor pack looks to be easy to see and held in place by 2 phillips head screws. It say on it that it is not repairable but I've know people that have repaired them in different vehicles. I don't know how hard it is to open up the part but you can ohm it out and see if you have an open. The outputs are labeled H, M1, M2 and L.

The blower speed control **** can also be bad, it provides a path to ground to the blower. High speed is direct ground, position 3 puts one resistor in the path to ground, position 2 uses 2 resistors and low uses 3 resistors.

Do you still have access to the shop manual? If not I can send you the wiring diagrams via email.

 

Yup, I've still got the 09 shop manuals. I dug out the wiring diagrams you were talking about and it seems pretty clear. Was planning on pulling the panel out tomorrow and see if I can debug it with a multimeter, sounds like I've for a resistor pack to look at as well.


Thanks

 

Hopefully it is the resistor pack - $30 at rock auto, the control switch assembly is $105 from dodge.

 

Looking at that wiring diagram it sure seems like the resistors would have to be ok since 1 & 3 work. Could be an issue between the pin and where it attaches to the resistor chain, but seems likely that it is the switch itself.

 

What are you driving those resistors are known to burn up and melt in certain dak and rangs

 

You are right but maybe just wiggle the connector at the resistor pack and see what happens. It's an open somewhere and sometimes the drawings Chrysler puts up are more like functional than actual. You're on the right track.

 

Don't pull the panel, just disconnect at the resistor pack and measure at the connector. One end of the ohmeter to ground other end to the connector pins. Put the blower dial to the setting that doesn't work and ohmout the pins, one should be a short, if all open then the switch is bad.

 

It was easier to just pull the panel and the resistor pack - 5 minutes to yank them and bring them in the house where it is warm. I've got a column shift so it is only 2 screws to pull that center bezel with everything attached. The problem was obvious as soon as I pulled the resistor pack. Thing is completely rusted up and the #2 pin is rotted out.


Nobody stocks them locally, I'll have to see if the dealer does Monday before ordering one online.