I can’t get the temperature control motor to work

1999 DODGE RAM
190,000 MILES • 5.9L • 6 CYL • TURBO • 4WD • AUTOMATIC
Avatar
CHANCE OLSON
  • MEMBER
  • 1 POST
I can’t get the temperature control motor to work. I changed that motor and the HVAC control unit in the dash. One wire has constant power at both ends, but as I move the dial from hot to cold, i never get power at the other two wires. Am I looking at having been sold a faulty control module?
Oct 23, 2019 at 10:12 AM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
It is possible but we should check power and grounds before we go any further. here is a guide to help with the HVAC wiring diagrams so you can see which wires to test:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Attached Media
Attached Media
Apr 23, 2021 at 11:45 AM