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Thread: Problem with AC

  1. #1

    Default Problem with AC

    First off, I didn't know where to post this so feel free to move it if this is the incorrect spot.

    We have a 2003 Suburban and it has developed a problem with the AC in the back. We have the dual zone heating and cooling with the front having it's own controls and then the back having it's own controls also.

    The problem is that when we try to get cold air to blow out only hot air comes out. It seems as if the blower is still fine, but whatever makes the air cold is not working. Is this a common problem? Expensive?

    Any insite to this problem would be much appricated.


  2. #2

    dwill3015's Avatar
    Join Date
    Jan 2007
    Yacolt, Washington
    Blog Entries


    Welcome to the site! Hopefully someone will have the answer to your problem shortly.
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  3. #3


    The blend door in the back is probably stuck or the motor that drives it is broke. It is all behind the side panel in the back.

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  4. #4


    Ok. I'll investigate that. Is it easy to remove the pannel in the back? Which side?

    I've taken a lot of my 4runners interior apart in the past so I know the basics.

    How much would it cost to replace that motor?

  5. #5


    So I just went out and looked at it and it was really easy to take apart. The unit is on the passenger side.

    What should I be looking for. I didn't completely remove the pannel, but I saw a big black box back there. Is it in that?

  6. #6


    Inside the big box are two blend doors. One controls which vents it blows out and the other controls temperature. The motors should be on the outside of the box. I haven't done this on a GM yet, but I'm in the process of doing it on my wife's Durango. On hers, the doors were broken.

  7. #7
    Jr. Engineer
    Join Date
    Jan 2009
    Rochester, MN


    How hot is the air that is coming out? Does it seem the same temperature as if you had the heat on or is it just not cold? Do you have the A/C turned on in the front when doing this? If the A/C is not turned on up front, the compressor is not going to be engaged and the rear A/C is not going to work.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  8. #8


    Thanks for the replies everyone. We ended up just taking it to a local shop Saturday morning and they were able to fix it in a few hours. They just flushed the system and that fixed it. It cost like $150ish, but it was worth it to us due to the fact we are going on a trip this coming week.

    They said they got the heat to blow 105 degress and the air to blow 42 degrees. That seemed pretty good to me.

  9. #9
    TrailLeadr's Avatar
    Join Date
    Jun 2005
    Coventry, Rhode Island


    Good to hear you got it sorted out. Have a safe trip.
    Rhode Island

  10. #10
    Jr. Engineer
    Join Date
    Jan 2009
    Rochester, MN


    Quote Originally Posted by 4runnerGuy View Post
    They said they got the heat to blow 105 degress and the air to blow 42 degrees. That seemed pretty good to me.
    I think 105 is kind of low. I seem to remember putting a thermometer right in the vent and seeing it around 140 or more.

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