Hi! A/C stopped blowing on my 2005 Dodge Caravan with Automatic Temperature Control so I replaced the a/c resistor after watching a video on YouTube. Air now blows and the temperature is adjustable, from cold to hot. Yay! But now the air will not turn off when a/c power button is pressed, turning off only when I turn the car off. When I turn the car on, the air blows high, and fan controls do not respond. I tried moving the rear fan power relay to the front spot in the fuse box but the result was the same. Side note, I did not disconnect the negative battery cable when I switched out the resistor. Any suggestions? Thanks!

 

wrong part?

 

It’s probably fine but check fuse 14 (20A) in the engine bay fuse panel (IPM) and replace if needed.

Dodge recommends disconnecting the negative battery cable when replacing the resistor, so I’d recommend doing that first. Disconnect it for 10 minutes, then make sure the fan speed is set to low. After reconnecting the battery turn the ignition on without starting the engine and leave it for about 1 minute so the HVAC module performs a calibration. Even if the fan is still blowing on high at first, give it a chance to calibrate before doing anything else.

The HVAC module is logic controlled, so this is either a calibration/programming issue or there’s problems in the wiring harness preventing speed control. Or, as primem suggested, it could be the wrong (or faulty) part.

 

First off, thank you so much Primem and GumbyRT for your time and assistance as I am not a mechanic. I tried GumbyRT's recommendation twice to the letter, first checking fuses. With no success after multiple attempts, I decided to remove the replacement resistor and install the inoperative one, thinking the new part was faulty. To my surprise, the original part came on and all is in right in my dodge's A/C. Weird, huh? Happy Labor to All and be blessed! Thank you!

 

Glad you got it fixed.