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Discuss 99 Tahoe - AC Problem in the alt.autos.gm forum at Car Dealer Forums; I have a high-mileage 99 chevy Tahoe and I've determined (mostly due to loud clanking ...
  1. #1
    jwh
    Guest

    Default 99 Tahoe - AC Problem

    I have a high-mileage 99 chevy Tahoe and I've determined (mostly due to
    loud clanking noises) that the A/C compressor has failed and needs to
    be replaced.

    Ok, so I've removed the compressor as well as the accumulator, the
    front orifice tube, and the rear A/C unit expansion valve. I didn't
    see any debris in any of these places so I'm going to keep the existing
    condenser, evaporator, and tubing. This is an R134a system and the
    warning label on the accumulator says to be sure to add proper
    lubricant (i.e. PAG).

    My service manual says:

    "Determine the amount of oil remaining in the accumulator and add that
    amount."

    In another place it says:

    "Determine the amount of oil remaining in the compressor and add that
    amount."

    Hmmm, confusing...

    The problem is that there is no oil, at least none that I can find, in
    the accumulator or in the compressor. I do find "trace" amounts in
    that if I stick my finger in the accumulator there is a film of oil
    there as is to be expected.

    So my question is HOW MUCH oil is to be added to this system prior to
    recharging with R134a? And where should it be added? One place in the
    service manual says add it to the compressor, another place says add it
    to the accumulator. Also, WHEN should it be added? Prior to
    evacuating the system or after evacuating but prior to adding the
    R134a?

    I don't want to trash my new compressor before it even gets going...

    Thanks, and any other tips on this particular system would be
    appreciated. BTW, this is the 4x4 4-door Tahoe w/ 5.7L V8. Has the
    rear A/C option as well.




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  2. #2
    putt@webtv.net
    Guest

    Default Re: 99 Tahoe - AC Problem

    >question is HOW MUCH oil is to be
    > added to this system prior to recharging
    > with R134a? And where should it be
    > added? One place in the service manual
    > says add it to the compressor, another
    > place says add it to the accumulator.
    > Also, WHEN should it be added? Prior
    > to evacuating the system or after
    > evacuating but prior to adding the
    > R134a?


    The PAG oil is added before evacuating the system. How much is
    determined by the total system oil capacity. Contact the place you
    bought the new compressor and ask what the compressor oil capacity is.
    They may also have the total system oil capacity. As to where it goes:
    some in the accumulator the rest in the compressor will equal the total
    system oil capacity. As an example: a system with the total oil
    capacity of 8oz=1.5oz in the accumulator/6.5oz in the compressor.

    Be sure you use the correct PAG oil. There are differences. The
    compressor manufacturer will have the PAG oil specification.

    Dave S(Texas)


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