A/C - Flushing Procedure Due to System Contamination

86jaguar01 DATE . . . . . . . . . . AUGUST, 1986

NUMBER . . . . . . . . . . J86/38


MODEL XJ6

SUBJECT CONTAMINATION OF AIR CONDITIONER SYSTEM AND EXPANSION VALVE:

FLUSHING PROCEDURE


KEY POINTS

PROCEDURE FOR FLUSHING

SYSTEM

Experience has indicated that it is of the utmost importance to thoroughly flush the air conditioning system with Freon 11 flushing agent or normal Freon 12, where contamination is suspected.

The following procedure must be followed:

CAUTION: USE PROTECTIVE GLOVES AND EYE PROTECTION EXTINGUISH NAKED FLAMES


Engine should be idled A/C on for at least 5 minutes to ensure maximum amount of oil is returned to the compressor.


1. Discharge the system.

2. Disconnect the inlet (low pressure) and outlet (high pressure) pipes from the compressor.




3. As indicated, fit a suitable blanking plate (A) over the end of the high pressure pipe (B) and retain with suitable (C) clamp. Also remove the schraeder valve from the charging connection on this pipe.

4. Place the open end of the low pressure pipe into a suitable metal container and cover.

5. Disconnect the high pressure pipe from the expansion valve and carefully remove the small conical filter and remake the pipe connection. In the event of the filter being contaminated, it must be thoroughly cleaned and refitted after the flushing procedure has been completed.

6. Carefully remove the thermal bulb coil attached to the evaporator outlet pipe (low pressure) and allow it to remain in ambient air. This will prevent the expansion valve from closing when the freon is passed through it.

7. Connect a suitable hose directly from the liquid connection on the Freon 11 bottle, to the charging connection on the high pressure pipe removed from the compressor.

8. Hold the Freon 11 container above the engine level and open the bottle. Allow the freon to flush through the system for approximately 30 seconds, or until a steady liquid flow is observed from the low pressure pipe, placed in the metal container.

9. Close the Freon 11 bottle off and remove.

10. Connect a Freon 12 container to the high pressure charging connection and purge all traces of Freon 11 from the system.

11. IMPORTANT: Ensure the following action is completed on reassembly: -

(A) Cheek the compressor oil level - top off if necessary.

(B) Clean and refit expansion valve filter.

(C) Refit thermal bulb coil on evaporator.

(D) Refit schraeder valve into high pressure pipe.

(E) Change receiver/drier.


12. Remake all pipe connections and re-charge system.

13. Check for system leaks.

NOTE: FREON 11 must only be used as a flushing agent and is available through automotive suppliers or domestic air conditioning specialists.


The following Repair Operation Time is applicable:


Operation Description Time

82.25.39 Expansion valve filter 1.95 hr.
remove, clean, flush and

(Revised as per J86/48 charge system.