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The question page blinked out before I could finish it. 2005 T&C, 3.7L with auto temp control. I am thinking blower switch. Can I buy the switch only or must I buy the whole control unit?
Fan wire looks fine.
Can you give me a part number for the switch?
The part number is for the rear climate control panel in the head liner. The only correct number I can find is 5136781AA and is for the complete control unit, which costs $600.
Is it possible to replace the speed control in the front unit?
How can I verify that it is the speed control which is bad.
Symptom review: The resistor was replace and verified good.
The fan runs with the unit powered or not.
When powered the fan runs at a medium speed. When not powered it runs at the faster speed for recirculate.
I did blow the 40 amp fuse while testing the fan motor.
I do apologize for giving you the rear part info instead of the front. It appears, that the front blower switch only comes as a complete control head assembly. You definitely have a short to power somewhere. Most likely it is the blower switch itself, but the circuit could always have a shorted wire too. Before replacing the entire control head, pull it out and trace the wire to the blower motor. Hopefully, you will see a frayed wire that can be easily repaired. The best way to test for this is to disconnect the control head (just unplug the connector) and straight wire the switch to the blower resistor. If the blower acts normal, then you have confirmed a wire issue and will have to trace down the blower circuit. If the blower acts the same when straight wired, you have confirmed the blower switch fault. See the wire diagrams below:
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