1. Chevy Truck Forum

    Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online

    Online since 2004, we're the #1 Chevy Truck & SUV user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free

    Registering is Free and Easy! Do it today and we'll see you on the forums soon!

A/C compressor oil? where does it go?

Discussion in 'General Chevy & GM Tech Questions' started by 97burban, Aug 21, 2008.

  1. 97burban

    97burban New Member

    I am replacing the A/C compressor on my 97 Suburban,I was told to make sure that I put the oil in the compressor.Where do I put it at? Can someone tell me what to undo or where to put it at?

    ill.png [​IMG]

    Attached Files:

    Last edited by a moderator: Jun 24, 2013
  2. collinsperformance

    collinsperformance Epic Member 5+ Years 500 Posts

    it get added just like the freon thru the supply lines. make sure you got the correct oil for the freon you have.....mike
  3. 97burban

    97burban New Member

    Ok thanks.So once I get the system evac'ed and recharged,they will add the oil then.
    Also,I just called a auto parts place and they told me that I needed to buy a whole kit of things for my a/c unit to replace everything.My compressor did not lock up yet,the accumulator had been replaced recently before I bought it.Not sure about anything else,but is there something else I sohuld buy with the compressor.
    I know th guy at the auto parts store also said that the oil went into the back of the compressor,so thats why I was asking.
  4. GaryL

    GaryL Epic Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    Your new compressor will probably be shipped dry. You will need to add the proper amount of oil to the compressor through the openings in the back where the lines hook up before you install the lines.

    General Motors Corp. - Compressor Refrigerant Oil Checking
    Chevrolet, GMC, Oldsmobile, Pontiac: Trucks/Vans
    NOTE: Always refer to underhood A/C specification label in engine
    compartment or A/C compressor label while servicing A/C
    system. If engine compartment/compressor label specifications
    differ from specifications in this article, use
    underhood/compressor label specifications.
    NOTE: DO NOT exceed A/C system refrigerant oil capacity when
    servicing system.
    (1) Oil Refrigerant
    Application Ounces Ounces
    "C" & "K" Series
    Pickup & Sierra .............. 8.0 ................ 32.0
    Crew Cab & Utility ........... 8.0 ................ 36.0
    Suburban, Tahoe & Yukon
    With Rear Unit ............. 11.0 ............... 64.0
    Without Rear Unit ........... 8.0 ............... 36.0
    (1) - Total system capacity, unless otherwise noted. Refer
    to underhood A/C specification label in engine
    compartment for specified oil type.
    (2) - Refrigerant oil and/or refrigerant capacity not
    available at time of publication. Refer to underhood
    A/C specification label in engine compartment.
    NOTE: Use ONLY the specified oil for the A/C system or compressor.
    Always check the underhood A/C specification label or A/C
    compressor label before adding refrigerant oil to A/C
    Use only NEW, moisture-free refrigerant oil in A/C systems.
    Refrigerant oil is highly refined with a very low moisture content.
    Oil container must be tightly closed when not in use, or moisture from
    air will be absorbed into refrigerant oil.
    Refrigerant R-134a systems use Polyalkylene Glycol (PAG)
    refrigerant oil. Using a mineral oil based lubricant with R-134a
    systems will result in A/C compressor failure due to lack of proper
    All compressors have different lubrication requirements and
    use different Polyalkylene Glycol (PAG) refrigerant oils. Use only the
    specified PAG refrigerant oil for the appropriate system and A/C
    compressor. Always check the underhood A/C specification label or A/C
    compressor label before adding refrigerant oil to A/C
    compressor/system. The following types of R-134a refrigerant oil are
    currently available.
    General Motors
    On all models except Saturn, use PAG Refrigerant Oil (Part
    No. 12345923). On Saturn, use Saturn PAG Refrigerant Oil.
    NOTE: PAG oil absorbs moisture very rapidly, 2.3-5.6 percent by
    weight as compared to a mineral oil absorption rate of .005
    percent by weight.
    Discharge A/C system, using approved refrigerant
    recovery/recycling equipment before loosening any fittings. Follow
    refrigerant recovery/recycling equipment manufacturer’s instructions.
    After system is discharged, carefully clean area around all
    fittings to be opened. Always use 2 wrenches when loosening or
    tightening fittings. Some refrigerant lines are connected with a
    spring-lock coupling. Special tools may be required to disconnect
    lines. Cap all openings as soon as lines are removed. DO NOT remove
    service valve caps until ready to connect lines and fittings.
    NOTE: All R-134a based systems use 1/2-16 ACME threaded fittings.
    Ensure all replacement parts match the connections of the
    system being worked on.
  5. GaryL

    GaryL Epic Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor


    Always use NEW gasket or "O" rings when connecting lines or
    fittings. Coat "O" rings with NEW refrigerant oil, and ensure it is
    not twisted during installation. To prevent damage to lines and
    fittings, always use 2 wrenches or specified tools. Keep refrigerant
    oil off fitting threads. Long term contact of oil on threads may cause
    future damage to threads.
    After component service or replacement has been completed,
    evacuate system thoroughly with a vacuum pump. Charge system with
    proper amount of refrigerant. See REFRIGERANT OIL & R-134a REFRIGERANT
    CAPACITY TABLE. Perform leak test. After system has been leak tested,
    check system operation.
    NOTE: A/C systems normally will not need additional refrigerant
    oil unless oil loss has occurred due to ruptured lines,
    leaking compressor seals, compressor overhaul or component
    HARRISON HD6/HT6, HD6/HR-6HE 6-CYL., V5 5-CYL. & V7 7-CYL.
    NOTE: Replacement compressor may be shipped with 8-9 ounces of NEW
    refrigerant oil. Drain NEW shipping refrigerant oil into a
    clean container and retain for later use.
    1) Operate system for several minutes to stabilize system, if
    possible. Turn engine off. Discharge A/C system, using approved
    refrigerant recovery/recycling/recharging equipment. Remove
    compressor. Drain and measure refrigerant oil from old compressor
    through suction and discharge ports, and drain plug.
    2) If no compressor oil leaks exist and more than one ounce
    is drained, add drained amount using NEW refrigerant oil. If less than
    one ounce is drained from old compressor, add 2 ounces of NEW
    refrigerant oil.
    3) When replacing other A/C components, add specified amount
    of NEW refrigerant oil to component. See HD6/HT6, HD6/HR-6HE, V5 & V7
    COMPONENT REFRIGERANT OIL CAPACITIES table. Install compressor drain
    plug and compressor. Evacuate and charge system. Perform leak test.
    Ensure A/C system is operating properly.
    NOTE: Approximately 3 ounces of refrigerant oil, suspended in
    refrigerant, will be lost due to a large, abrupt leak. When
    replacing a faulty A/C component, add amount of NEW oil
    specified for component plus 3 ounces to compensate for oil
    loss. If oil cannot easily be added to component, add it to
    Component Ounces
    Except "U" Series .................................. 3.5
    "U" Series ......................................... (1)
    Except "U" Series .................................. (3)
    "U" Series ......................................... (2)
    Except "U" Series .................................. 1.0
    "U" Series ......................................... (1)
    Except "U" Series .................................. 3.0
    "U" Series ......................................... (1)
    (1) - Information not available at time of publication.
    (2) - Ensure replacement compressor contains the same
    amount of NEW refrigerant oil as was drained from old
    (3) - Drain and measure refrigerant oil from old compressor.
    If old compressor had less than one ounce, add 2
    ounces of NEW refrigerant oil to replacement
    compressor. If old compressor had more than one ounce,
    add the same amount of NEW refrigerant oil to
    replacement compressor.
  6. JersSub

    JersSub New Member

    I just replaced mine on a 96 Sub. The low and high lines connect to the top of the compressor, when the lines come off you will see the openings that is where the oil goes, make sure you have the right type of oil. Even if you refill the system with oil and freon combined the new compressor still needs oil as they usually ship dry. good luck
  7. 97burban

    97burban New Member

    Thanks for all the replies.I am going to get the compressor next week and put it on.I am putting on my power steering hose and resistor switch now.
  8. codyboy

    codyboy New Member

    Warning Will Robinson

    You put the correct oil in one of the holes (high side or low side) of the A/C compressor. Then have them charge the system. If you disconnect the hoses to put in the oil once it has been charged you will have a BIG MESS on your hands. Your newly pressurized system will cause the new oil, dye, and refrigernt to spray out all over.

    Use the type of oil required and the speficif amount (down to ml's).

    After you remove the A/C/ unit have them clean the system (it'll be worth it).

    I hope I am not too late.

  9. ChevyFan

    ChevyFan November Beard Grower - Cancer Fighter Staff Member 5+ Years 5000 Posts

    This looks like a very popular thread on here as well. If you find the answers on here to be helpful please remember to click the "Thanks" or the "Like" links to express your appreciation.

Share This Page