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  1. #11
    Jr. Mechanic
    Join Date
    Apr 2011
    Wylie, Texas, United States


    Okay, after a fat finger episode, I will enter this again. I now have the dash rolling down on the dash pins to a degree, but the steering column only goes down so far and so the dash only goes down so far on top of it. I will look next at removing the wires and such; but it still seems it will not go down far enough to get to the A/C box under the dash. I also wonder just how the dash comes out at all since there are plates right above the dash pins that will not allow you to pull the dash up and off the pins. Any thoughts?

    95 Chevy Silverado
    Beat up by hail and a faulty tow truck
    5.7L V-8
    251,000 miles

  2. #12


    Quote Originally Posted by GaryL View Post
    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.
    Any suggestions on replacing the rear expansion valve in a 99 suburban? I have the interior and all screws apart but i cant reach 2 screws between the fender and the black rear evap housing. I cant imagine I would have to disconnect all the lines from underneath? especially since service bulletin mentions cutting a hole in the box. How can i get to the last screws?

  3. #13
    Jr. Mechanic
    Join Date
    Apr 2011
    Wylie, Texas, United States


    Thanks, Mr. Bacon. That was a couple of years ago; I was ultimately successful when I learned you have to detach the box from the firewall under the hood. Shoulda read more when I was doing it. !

    Unfortunately I have no advice on the expansion valve other than to say I have had to drill holes to get to screws in the past. Window motor on an 84 Thunderbird comes to mind.

    There are videos on youtube about changing the rear expansion valve; maybe they can help.

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