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Followup To
Question -
I have 94 Mitsubishi Galant 4 cylinder 134a a/c, after I fixed the leak on the service valve and try to pull a vacuum, but the pressure always go back up. I can't find any leak on the system. What about this polyester oil?
Answer -
Your question makes no sense.
1. You fix the leak.
2. You pull a vacuum.
3. Pressure always goes back up.
Makes no sense.
What I mean is that after I vacuum the system for 30 minutes the vacuum gauge goes back up to zero. I repeated this for about 3 times. I cannot vacuum the system.
Answer1. Your putting the RED hose on the HIGH side valve and the BLUE hose on the LOW side valve.
2. Your opening up both high and low valves on the gages.
3. Your hooking up a vacuum pump to the white hose that goes to the center port on the gages.
4. Your putting the other end of the white hose onto a vacuum pump.
5. Your turning ON the vacuum pump.
6. After about a half hour the gage reads a vacum mof approx 28 inches of vacuum.
7. Your CLOSING the LOW and HIGH side valves on the gages.
8. Your turning OFF the vacuum pump.
9. The gage is NOT maintaining the 28 inches of vacuum for atleast a half hour.
10 If all above is correct, You have a leak in your system.
