A/C System Filtering
Set, A/C Fittings:
SPECIAL TOOL(S)
CAUTION: Follow all refrigerant system safety precautions.
1. An A/C kit has been released to provide the necessary equipment and information to perform the new, mandatory A/C system filtering procedure.
2. To determine that the A/C compressor has failed and must be replaced, remove the A/C evaporator core orifice and condenser to evaporator tube, if necessary. Look for a dirty A/C evaporator core orifice or a condenser to evaporator tube containing black refrigerant oil and particles.
3. Remove the damaged A/C compressor. Drain the oil into a calibrated container.
NOTE: Cap all open refrigerant lines and components to prevent entry of dirt and moisture.
4. A new FS-10 replacement A/C compressor contains no refrigerant oil. Fill the new compressor with new refrigerant oil.
NOTE: The proper amount of refrigerant oil must be added to the new A/C compressor before it can be installed. The procedure for the FS-10 is given.
5. Install the new A/C compressor. Be sure the compressor mounting bolts are tightened to the proper specification. Check the tension of the drive belt.
NOTE: It will be necessary to transfer the A/C clutch from the old A/C compressor to the new A/C compressor.
6. Remove the suction accumulator. Drain the oil into a calibrated container.
7. Add clean refrigerant oil to the new suction accumulator in the same amount that was removed from the old unit, plus an addition 60 ml (2 oz) of new refrigerant oil.
8. Install the suction accumulator in the vehicle.
9. Use the correct repair kit for the vehicle on which you are working. Filter kit with the SPN suffix A is used on vehicles with a nylon lined evaporator to compressor suction line.
Filter For Nylon Hose:
10. Remove a length of evaporator to compressor suction line to accommodate the suction filter and install the filter using the clamps provided with the kit. Be sure the filter is correctly oriented for refrigerator system flow. Check the label on the filter. On the filter for the nylon lined evaporator to compressor suction line, install O-rings (two on each filter tube being sure they are properly seated in the grooves on the tube). Tighten the clamps securely.
11. Install a new A/C evaporator core orifice. If the A/C evaporator core orifice is located in the condenser to evaporator tube between the A/C condenser core and the A/C evaporator core, replace the condenser to evaporator tube.
12. Install a pancake filter in the condenser to evaporator tube between the A/C condenser core and the A/C evaporator core orifice. Be sure the filter inlet is toward the A/C condenser core. Connections can be made using A/C Test Fitting Set and flexible refrigerant hose of 2500 psi burst rating. Individual fittings are also available.
13. Evacuate, charge and leak test the system.
14. Check all refrigerant system hoses, lines and the positioning of the newly installed filters to be sure they do not interfere with other engine compartment components. If necessary, use tie straps to make adjustments.
15. Provide adequate air flow to the front of the vehicle (with a fan, if necessary), and set the selector valve at MAX A/C. Set the blower motor on HIGH and temperature control at full cool. Start the engine and let it idle briefly. Make sure the A/C system is operating properly.
16. Gradually bring the engine up to 1200 RPM by running it at lower RPMs for short periods (first at 800 RPM, then at 1000 RPM). Set the engine at 1200 RPM and run it for an hour with the A/C system operating.
17. Stop the engine.
18. Allow the engine to cool sufficiently to remove the fittings, flexible hoses and pancake filter from the condenser to evaporator tube. (It will be necessary to discharge the system first.) Refrigerant Recovery
19. Discard the pancake filter. It can be used one time only.
20. Reconnect the condenser to evaporator tube back into the system.
21. Evacuate, charge and leak test the system.
22. Check the operation of the A/C system in all modes.