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Buick Forum: 1993 Roadmaster Estate Wagon: How hard is the evap core to replace?
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  1. #1
    kastein is offline Buick Newbie My Buick(s): 1993 Buick Roadmaster Estate Wagon w/ L05
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    Question 1993 Roadmaster Estate Wagon: How hard is the evap core to replace?

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    Hi,
    Found the forum via google while trying to figure this out. Specifically, a thread about replacing the heater core on a 1994, which I believe is somewhat redesigned from the 1993 - I know they changed the engine and parts of the AC system.

    Can I do the evap core without pulling the dashboard out on this thing? It's my wife's and she loves it dearly and I really really don't want to pull any more plastics than I have to, because they are all quite brittle. I've got plenty of practice and a full set of AC tools (gauge set, vacuum pump, UV dye, UV lamp, line disconnect tools... etc etc etc) and have done evap replacements on many other vehicles, but nothing this brittle or sentimental. Normally I'd just dive in and pull the dash. I'm doing an R152a conversion, and since the compressor failed and blew metal dust and shrapnel through the whole system and it's a parallel-flow stacked plate evap core (at least - all the replacement ones I can buy are) I don't want to just try flushing it, though I do have tools to do so. All parts except for the liquid line and evap core will be brand new, and I'm wondering if I should risk skipping the evap core after all.

    It does have the automatic/"fancy" HVAC system, if that matters. I can post the full RPO list when I get home.

  2. #2
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    Re: 1993 Roadmaster Estate Wagon: How hard is the evap core to replace?

    If you had a compressor fail, you really should do new everything. Go to rockauto and get all new lines and everything. Its going to be about 400 to 500 bucks.

    That way, with the proper oil charge, you will be able to get good life out of the system.
    1994 RMSB - Purchased 6/15 171K
    Sat for 5 years after being hit on driver side by deer. Broke windshield, driver door window, mirror and headlight.
    Also destroyed quarter panel and rear door (still works!).
    All Options but tow pkg.
    Upgrades: Home Depot COOL (soon to be COLD) air intake, AIR delete, 20/5 Tint, TB bypass, Improved cooling system (done by me), Kenwood BT Radio

  3. #3
    kastein is offline Buick Newbie My Buick(s): 1993 Buick Roadmaster Estate Wagon w/ L05
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    Re: 1993 Roadmaster Estate Wagon: How hard is the evap core to replace?

    That's actually what I've already planned on doing at this point, in fact the new condensor, capillary tube, seals, compressor, and dryer are on the shelf at home and the new lineset from the compressor to the condensor and dryer got ordered 30 minutes ago, along with a new evap core and the line from the evap to the dryer. The only piece I can't find new is the liquid line from the condensor to the evap, which is NLA from GM and not available NOS anywhere else, nor produced aftermarket. Since it is a single piece of aluminum tubing with fittings brazed to the ends, I settled for running solvent, compressed air, solvent, a pipe cleaner with solvent, and more solvent through it.

    That being said - still interested in whether I'll have to pull the dashboard, which was my original question. I have searched google and youtube for quite some time and the factory service manual (real, official Buick one! It's like 2 inches thick) doesn't clarify much either, it just says start pulling the dash apart. I fear the worst because of that, though I've seen plenty of vehicles where you can get away without doing it through some careful trickery the factory techs didn't come up with. Any idea?
    Other vehicles I own: 2001 Subaru Forester, 1994 Subaru Justy, 1991 Jeep Comanche, 1988 Jeep Comanche, 1980 Datsun 720, 1979 Jeep J10 Honcho, 1958 Kaiser Jeep M54A2
    If you are in the central Massachusetts area and puzzled by electrical system issues with your 1995 or older Buick, message me. I just bought a Snapon MT2500 scanner and enjoy using it and learning more about its capabilities. No charge.

  4. #4
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    Re: 1993 Roadmaster Estate Wagon: How hard is the evap core to replace?

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    Sorry...

    I think there was an interior change in 94. My 94 can have the evaporator and HC changed just from under the dash. Not a bad job.

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