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  1. #1

    Default I need an Evaporator Coil removal how to.........

    Hey guys - new to the site.

    Anyone have a how-to for a AC evaporator coil removal on a 99' Suburban. The upper connection was tight on the accumulator and I must have cracked a weld or something as now I have a leak just behind the firewall. I understand the entire lower dash has to come out - I'm just looking for a step by step (or at least the important steps).


  2. #2


    See if this helps you:

    Removal & Installation
    1) Disconnect negative battery cable. Discharge A/C system,
    using approved refrigerant recovery/recycling equipment. Drain cooling
    system. Remove glove box. Disconnect electrical connectors, if
    necessary. Remove floor air distribution duct.
    2) On diesel models, remove Powertrain Control Module (PCM)
    and mounting tray. On all models, remove trim panels. Remove blower
    motor cover. Remove blower motor-to-case screws, and remove blower
    motor. Loosen steering column bolts from instrument panel. Remove
    carrier and body bracket bolts supporting instrument panel (located on
    firewall and at each end of instrument panel). Tilt back or remove
    instrument panel as necessary.
    3) Remove coolant recovery tank. Remove heater hoses at
    heater core. Disconnect inlet and outlet lines at evaporator core, and
    cap openings. Remove accumulator. Remove A/C-heater assembly-tofirewall
    screws and bolts. Remove A/C-heater assembly from vehicle.
    4) Remove heater core cover from A/C-heater assembly. Remove
    heater core and seal from A/C-heater assembly. Remove air distribution
    lower case. Remove evaporator core from A/C-heater assembly. See
    Fig. 3.
    5) To install, reverse removal procedure. Add 3 ounces of
    clean refrigerant oil to evaporator. Lubricate NEW "O" rings with
    clean refrigerant oil prior to installation. Fill cooling system, and
    check for leaks. Evacuate, charge, and leak test system.

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

  3. #3


    Gary, you are the man! It's as involved as I expected. Wish me Luck.

    God, I love the internet!


  4. #4


    Hey there;

    I am replacing my evaporator core at least attempting to but I have a couple of questions regarding the steering column removal.... Do you need to do this or is there a trick to get around this.

    also the instructions say remove the Hinge pillar trim panels Is this the pipe that goes across the entire dash? I am trying to get the process on how to gain room to access the evaporator case before I pull the dash apart. I have a 1996 K1500 Suburban with front and rear heat\AC I am only working on the front evaporator.

    The instructions I have is from ALL Data, I pulled from the local library. Any help would be greatly appreciated.

  5. #5


    Quote Originally Posted by maury View Post
    Gary, you are the man! It's as involved as I expected. Wish me Luck.

    God, I love the internet!

    There are two bolts at each end of the dash that need to be removed the dash can then be rotate on the hinge pins. some of the other small bolts may have to be removed to just let the dash release. I took mine out of the top with a friend helping.

  6. #6


    what good is this gary if there are no pictures and figures that you refer to

  7. #7

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    Probably doesnt matter since that was a year ago
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  8. #8
    Jr. Mechanic
    Join Date
    Apr 2011
    Wylie, Texas, United States


    I am curious about the steering column. Is this only to free up the dash for removal? I plan to start this job tomorrow or Monday on my 95 Chevy Silverado. I need the evaporator, and figure after all that trouble I should change the 16 year old heater core as well.

    Maury (the other Maury)

  9. #9


    As it just so happens, I helped my uncle pull the dash out of his 99 dually yesterday. The steering column has to be removed to allow the dash to drop. I wasn't around for that, but my uncle says it was a pain. There are 7 bolts keeping the dash from rotating on the lower dash pins, 3 along the top heater vents, 1 on either end of the lower dash, and 2 around the passenger airbag area. That gets the dash to tilt down. Then you have to pull the air duct which is held in by 1 bolt on each side. Then, to get the dash all of the way down, you have to pull the wiring harness off the dash. Then the dash can be removed and the a/c box accessed. We didn't get to pulling the a/c box out, but it looks like it's going to require pulling the dash support plate off and a big bolt holding it to the firewall. This is definitely NOT something that can be done in a day. Allot at least 2 days to complete, quite possibly 3.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  10. #10
    Jr. Mechanic
    Join Date
    Apr 2011
    Wylie, Texas, United States


    Thanks, Mr. Crawdaddy. I plan to get started Monday or Tuesday, depending on the rain we are supposed to get.
    95 Chevy Silverado
    Beat up by hail and a faulty tow truck
    5.7L V-8
    251,000 miles

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