C. Removal of Mineral Oil From A/C System

Note:
During the conversion to R134a refrigerant, it is important to remove as much mineral oil from the A/C system as possible.

Procedure





1. Press button.

2. Set temperature selector wheels to max. heat detent (red zone).





3. Press button.





4. Engage max. A/C fan speed (Tempmatic) or Press button if automatic A/C.

5. Close all doors and windows.

6. Run engine at 2000 rpm for approx. 10 minutes.

7. Stop engine.








8. Using air conditioning service equipment, evacuate R12 refrigerant at high-and low-pressure sides (A, Figure 2 and B, Figure 3) of A/C system for 45 minutes.

Note:
A/C service equipment should be able to pull at least 29.2" of vacuum.

9. Refill recycled R12 once again into A/C system.

10. Operate A/C system again, as in above steps 1-7 for approx. 10 minutes.

CAUTION!
Should the A/C compressor become noisy, stop engine and continue with "D. Replacing Receiver/Drier".

11. Using air conditioning service equipment, evacuate the R12 at high- and low-pressure sides (A, Figure 2 and B, Figure 3) of A/C system for 45 minutes.

Note:
A/C service equipment should be able to pull at least 29.2" of vacuum.

CAUTION!
At this point, R12 is not to be used in A/C system again.