GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 3 of 3
  1. #1

    Default 2003 suburban A/C problems...

    The guy at the garage is scratching his head. He can’t figure out why the A/C on my suburban is not working. He charged the entire system, it was empty…and he even changed out one of the sensors. How can I describe the situation like he did: its like the vehicle does not know what the ambient temperature is outside of the vehicle, so it won’t turn on the A/C” anybody else ever run into this trouble….hes saying he needs more diagnostic time, that means dollar signs…he said he cleared all the codes, and there were a few, but he still can't get it to blow cold...

  2. #2


    When he charged the system, did he vacuum it out at all? If it was empty, this would have been a crucial step.
    Also, if your truck can't read the ambient temperature, then the ambient air temperature sensor might be bad or have damaged/loose wiring. Have him check that out.

  3. #3


    okay heres the deal...there are two sensors in the grill of the burban. one goes to the thermometer on the rear view mirror, there should be a second one that goes to the ambient air ambient air temp sensor was hidden behind my signal light on the passenger side due to a collision with a dear. the sensor troubleshot was the thermometer....once we located the correct sensor we determined it was bad and replaced it. still had to take the dash apart and change a switch that controls the return or recirc air before we could get the A/C to work as it should...but its working for now...good thing I love my rig!!

Similar Threads

  1. 2003 gmc 2500 hd dic problems
    By bry2500 in forum Member Introductions
    Replies: 4
    Last: 08-06-2009, 09:24 AM
  2. 2003 gmc 2500 hd dic problems
    By rdillion in forum General Chevy & GM Tech Questions
    Replies: 0
    Last: 08-02-2009, 05:31 PM
  3. Replies: 0
    Last: 07-14-2009, 10:10 PM
  4. Replies: 0
    Last: 07-06-2009, 08:30 PM
    By SILVER in forum The Coffee Shop ~ Chit Chat
    Replies: 0
    Last: 07-17-2006, 09:48 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts