Question about 2002 Lincoln LS

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How to change a/c compressor

Steps or diagram to change air conditioning compresor

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  • pagancpa Jul 20, 2009

    3.9 v8

  • pagancpa Jul 21, 2009

    i will like to knoww how i can change my rating to VERY VERY Helpful.



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3.0L or 3.9L engine?

Posted on Jul 20, 2009

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  • blueextc3221
    blueextc3221 Jul 20, 2009


    If installing a new air conditioning compressor due to an
    internal failure of the old unit, you must carry out the following
    procedures to remove contamination from the air conditioning system.

    If A/C flushing equipment is available, carry out the flushing of
    the air conditioning system prior to installing a new air conditioning

    If A/C flushing equipment is not available, carry out filtering
    of the air conditioning system after a new air conditioning compressor
    has been installed.

    Install a new thermostatic expansion valve, as directed by the A/C flushing or filtering procedure.

    Install a new receiver/drier, as directed by the A/C flushing or filtering procedure.


    If installing a new A/C compressor, the A/C clutch disc and hub ,
    A/C compressor pulley and A/C clutch field coil must be inspected and
    transferred from the old unit to the new unit if suitable for reuse.

    1. If flushing of the air conditioning system has not been performed, recover the refrigerant.

    2. Remove the air cleaner outlet tube.

    3. Remove the drive belt from the A/C clutch pulley.

    4. Raise the vehicle.

    5. Remove the screws and remove the sight shield.

    6. Remove the screw and position the power steering hose aside.

    7. Remove the bolt and reposition the A/C manifold and tube assembly.

    8. Disconnect the connector.

    9. Remove the three bolts and lower the A/C compressor.

    To install:

    1. If a new A/C compressor is to be installed, the clutch assembly must be transferred from the old unit to the new unit.

    2. If filtering of the refrigerant system is not to be performed,
      add the correct amount of PAG Refrigerant Compressor Oil (R-134a
      Systems) F7AZ-19589-DA (Motorcraft YN-12-C) or equivalent to the new
      A/C compressor..

    3. Lubricate the O-ring seal with PAG Refrigerant Compressor Oil (R-134a Systems) F7AZ-19589-DA (Motorcraft YN-12-C) or equivalent.

    4. If filtering of the refrigerant system is not to be performed, evacuate, charge and leak test the refrigerant system.

    5. Install the A/C compressor with the three bolts.

    6. Connect the connector.

    7. Install the A/C manifold and tube assembly.

    8. Replace the power steering hose aside.

    9. Install the drive belt on the A/C clutch pulley.

    10. Replace the air cleaner outlet tube.



    Installation of a new receiver/drier is not required when
    repairing the air conditioning system except when there is physical
    evidence of system contamination from a failed A/C compressor or damage
    to the suction accumulator.

    Thanks for using FixYa - a Very Helpful rating is appreciated for answering your FREE question.

  • blueextc3221
    blueextc3221 Jul 20, 2009

    Please reconsider raising your rating to Very Helpful.
    This is the exact procedure you are looking for.
    Most experts on FixYa do not provide information like this in the FREE questions.
    Your cooperation is appreciated.

  • blueextc3221
    blueextc3221 Jul 21, 2009

    There should be a "change my rating" at the bottom of the comment box.



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1 Answer

My compresor dont want to kikin

Which compressor are you talking about? The air ride or the A/C?

For the air ride, it has fuses and relays. All the door jam switches and cargo doors must be shut.

For the A/C, you would verify that the system has Freon before attempting to replace a compressor. A low pressure switch would deactivate the compressor clutch. The system would need to be Evacuated with a Vacuum pump and then recharged, It is not like changing a starter. After prepping the system, you may need to jump the low pressure switch to get an initial charge of Freon, then reconnect the low pressure harness to the cut-out switch.

You need some type of guage to measure the charge. When the system has enough Freon to let the Low pressure switch provide power to the compressor clutch; the signal will be restored to the compressor.

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did you use a manifold gauge, HI and LO side, if your compresor is not engaging probably due to a low charge, because your gages must read about 15F below ambient temperature that translate to on a 80f day uyour gage must read about 95psi on hi and lo (no compresor running)with compressor runing your lo side must be around 35psi and your hi side around 200+ psi depending on amount of air cooling your conderser, also note charging amout tag to not overcharge system, on other hand your problem may be a electricall, check your fuses and MG/C cluth relay by pass it to confirm your compresor is in good working condition.

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Compresor dont get current has diagrams for free when you register your car on their site. You can test the low pressure cut-off valve downstream from the evaporator tank by disconnecting the harness from the switch and using a good size wire to loop into the harness.

If the compressor clutch kicks in, you have either low system pressure or a bad low-pressure cut-out switch. This is a test procedure. Even bypassing direct as you have done can risk damaging the compressor.

Besides Freon, compressors need oil, the right type, and a small amount. There are Freon cans which include an oil charge as well as sealers and conditioners to prevent or fix leaks. Remember that the system has a volume limit and more additives leaves less room for the Freon to work good.

If you have low pressure, it is possible that what is left is contaminated. Freon is a gas. Air is a gas. The system was suppose to start with Vacuum negative pressure by using a Vacuum pump(Loaner item). This means that total volume inside your hoses could be wrong. It is easier to understand when you consider the Freon changes back to a liquid and Air needs a much lower temperature to become a liquid. So you lose volume for the Freon to change back from liquid to a gas. It constantly cycles like this to make it transmit heat from the cabin to the outside.

I hope my solution is helpful.

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I have replaced the air compresor the upper side and lower side switch and the air compresor won't come on what could be the problem

If you don't have pressure the clutch on the compressor will not come on. Have you checked your fuses. The first fuse you can check is the fuse for the A/C compressor clutch itself. That fuse is in the interior fuse panel. It is in the number 23 position and should be a 15 amp fuse (see 1st picture/diagram of fuse layout). If you have the 3.8 liter engine there is also a pressure switch fuse. That fuse is in the power distribution box located in the engine compartment in the number 24 position and should be a 20 amp fuse. i hope this helps and good luck.


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have you checked the orfis tube also called expancion valve also posible you got a bad compresor . have been there on getting bad parts 50 years experince.

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