B. Conversion Procedure

1. Remove the compressor and drain the mineral oil. Inspect oil for any unusual metal content. If a new compressor is a required adaptation part or is being replaced because it is a failed part, the mineral oil must be drained from the new compressor. In this case it will not be necessary to drain the oil from the old compressor.

NOTE:
IF THE COMPRESSOR HAS BEEN PREVIOUSLY REPLACED WITH A 709CA OR 709CC SERIES COMPRESSOR, IT WILL NOT HAVE TO BE REPLACED UNLESS IT HAS FAILED. IT CAN BE IDENTIFIED BY THE CASTING NUMBERS "709CA" OR "709CC" LOCATED ADJACENT TO THE SUCTION AND DISCHARGE PORTS.

2. With the compressor off the vehicle, refill with new R-134a refrigerant oil in the amount called out in the Adaptation Component Chart.

NOTE:
SPECIAL EFFORT MUST BE USED TO KEEP ALL R-134a SYSTEM COMPONENTS CAPPED TO PREVENT MOISTURE FROM ENTERING THE A/C SYSTEM OIL. MOISTURE IN THE OIL IS VERY DIFFICULT TO REMOVE AND WILL CAUSE A RELIABILITY PROBLEM WITH THE COMPRESSOR.

3. Remove and discard the filter/drier/accumulator.

4. Replace the HPRV (High Pressure Relief Valve) with the specified R-134a part listed in the Adaptation Component Chart. Refer to the appropriate Service Manual for location. In some applications the HPRV is located on the filter/drier. The HPRV on the new filter/drier must be replaced with the new R-134a HPRV.

5. Replace the HPCO (High Pressure Cutout switch). Refer to the appropriate Service Manual for location. For vehicles without HPCO switches, install a switch and wiring overlay in the system on the high pressure R-134a adaptor switch tee as specified in the Adaptation Component Chart. For SJ/XJ/YJ vehicles, the LPCO (Low Pressure Cutout Switch) is located on the filter/drier and must be replaced with a dual function HPCO/LPCO switch as specified in the Adaptation Component Chart.

6. Install the filter/drier or accumulator using new R-134a compatible gaskets or 0-rings.

7. Install the compressor on the vehicle using the new R-134a compatible gaskets or 0-rings.

8. Clean old R-12 service ports with a steel brush.

NOTE:
REMOVE THE SCHRADER VALVE CORE FROM ALL R-12 SERVICE PORTS EXCEPT WHEN USING STRAIGHT R-134a ADAPTERS. FAILING TO DO SO WILL PREVENT THE SYSTEM FROM BEING EVACUATED OR FILLED WITH REFRIGERANT.

9. Review the R-134a adaptor choices as identified in the Adaptation Component Chart. Refer to the R-134a Charge Port Adaptor chart and select the appropriate port adaptor which allows for sufficient clearance in the engine compartment to attach R-134a service equipment couplings and/or HPCO switches. Also check for proper clearance between the hood and the R-134a adaptor/switch.

NOTE:
CAP OFF ANY REMAINING R-12 PORTS USING SEAL CAP P/N 4773153 (318-24 THD.) OR P/N 4773154 (7/16-20 THD.).

10. Evacuate the system for a minimum of 45 minutes at 26 in. Hg or greater. Charge the system with R-134a with the amount called out in the Adaptation Component Chart.

NOTE:
THE A/C SYSTEM SIGHT GLASS IS NOT VALID FOR DETERMINING THE CORRECT R-134a CHARGE LEVEL ON A ADAPTED SYSTEM. THIS IS DUE TO THE RESIDUAL MINERAL OIL LEFT IN THE SYSTEM. IT IS HELD IN SUSPENSION AND DOES NOT MIX WITH R-134a REFRIGERANT. IT WILL APPEAR AS A WHITE "MILKY" STREAM OF REFRIGERANT THROUGH THE SIGHT GLASS.

11. Fill in the required blue R-134a A/C adaptation label, P/N 4762869, using a typewriter or ball-point pen. See label illustration for details. If possible, place the new label over the existing R-12 label. If the new label does not completely cover the existing label, remove the old label before installing the revised label. If the A/C information is part of a general vehicle information label, cut out only that part that pertains to the A/C system.

NOTE:
THE CLEAR MYLAR OVERLAY MUST BE INSTALLED OVER THE NEW LABEL.

12. Check system for leaks with approved R-134a equipment that meets Chrysler and SAE J1627 specifications.