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I can’t get the temperature control motor to work

Tiny
CHANCE OLSON
  • MEMBER
  • 1999 DODGE RAM
  • 5.9L
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
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?
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Wednesday, October 23rd, 2019 AT 10:12 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 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.
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Friday, April 23rd, 2021 AT 11:45 AM

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