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PAG Oil water absorption

Old Codger on Thu September 11, 2008 12:48 PM User is offline

Year: 1995
Make: Toyota
Model: Camry
Engine Size: 4 Cyl
Refrigerant Type: 134a
Ambient Temp: 90
Country of Origin: United States

OK, I was wondering how quickly PAG oil absorbs water vapor. The new replacement compressor that I bought comes filled with 8oz of PAG oil. One source has suggested that I drain it all out to verify that I have that amount of oil and then refill it. (Actually he suggested to put 6 oz back into the compressor and 1 oz to the evaporator and 1oz to the condenser. I have completely flushed everything and will install a new receiver/drier. The Camry manual says that the system takes a hair less than 8 oz.) All this sounds reasonable to me but I expect that the oil will be out of the compressor for a couple of hours and in the vented system for a while longer before I can get everything hooked up and can apply a vacuum to it.

How long can I allow PAG oil to stay "in the open" before it absorbs too much water?

When I put a vacuum on the closed system will it pull entrained water out of the oil itself?

Are there any "tricks of the trade" that I can use to minimize the oil's exposure to air and even the system's exposure to air?

Is exposure to air (I'm in Houston and there is about 80% humidity on the average) that big of a deal if I am going to vacuum out the system for several hours?


TRB on Thu September 11, 2008 2:05 PM User is offlineView users profile

Depends on the moisture in the atmosphere. I would not leave a vehicle open for a day or two with any oil type. Best to do as much as possible add oil and button the system up ASAP. We can have a system open for a good part of the day if we just changing a component.


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