servicing the rear air system
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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, servicing the rear air system in Cadillac Escalade Forums; now before i start i do suggest you take the truck to the dealer to pinpoint what is needing replaced ...
  1. #1
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
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    servicing the rear air system

    now before i start i do suggest you take the truck to the dealer to pinpoint what is needing replaced after that you can follow my how to

    total time it takes is about a hour to 2 hours depending how fast you work

    first find the tools you need to remove the battery cable and the panel over the area where the rear air is at

    first in order to remove the big panel over the rear air you have to remove a few other trim pieces just look at the pics and you will be able to do it IMG_0596.jpgIMG_0595.jpgIMG_0598.JPGIMG_0597.JPGIMG_0600.JPGIMG_0601.JPG i didn't get a pic of the rear tweeter and urpa display but just gently pull on the side near the window and it will come out after you have removed all of the trim peices and the panel you will see this
    IMG_0594.JPG and i will tell you which is which with pics
    this is the module that works the rear air so if you have a possible battery drain along with either no temp or vent control then this will possible need replacing but if you have no fan control then the module near the blower is the one to replace if everything else works
    and there is two acuactors one near the front and near the rear
    the front one works the vent control the rear works the temp control but both are the same but here is a couple of pics of them
    IMG_0605.JPGIMG_0606.JPG now before you reinstall the panels in place here is how to recalabrate the system after you reconnect the battery cable turn the key to run for 2 mins then turn off then start the truck then you will be good to go.
    JimmyH, JimmyH, jnrsesv and 2 others like this.

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  3. #2
    the cadillac man's Avatar
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    Re: servicing the rear air system

    i'd like this to be made into a sticky please

  4. #3
    nelson480's Avatar
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    Re: servicing the rear air system

    Good to know, Have to do it soon for my dads 02

  5. #4
    JimmyH is offline Cadillac Owners 10000+ Posts
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    Re: servicing the rear air system

    Nice post. Added to the newly created FAQ thread.

  6. #5
    Freeflyer is offline Cadillac Owners Member
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    Re: servicing the rear air system

    I have a 99 and the rear a/c blows and the heat works but no cold. I was told that it was the expansion valve. Is there something easier to check first before I tear this completely apart and bust the freon lines?

  7. #6
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
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    Quote Originally Posted by Freeflyer
    I have a 99 and the rear a/c blows and the heat works but no cold. I was told that it was the expansion valve. Is there something easier to check first before I tear this completely apart and bust the freon lines?
    I suggest removing the covers to get access to the system to make sure that the actuators are responding to the controls(this is how mine did but it was cold air) most times if you have ac in the front the rear should too as they both use the same compressor

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    Freeflyer is offline Cadillac Owners Member
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    Re: servicing the rear air system

    Thanks, I will report back of what I find.

  9. #8
    the cadillac man's Avatar
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    Quote Originally Posted by Freeflyer
    Thanks, I will report back of what I find.
    I did a how-to for servicing the rear air system it is under the FAQ sticky

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