AC refrigerant oil questions

[Sparkee]

I have a '95 Suburban with rear AC, the AC has never worked since I have owned it. I am getting ready for a road trip and decided to get the AC working. I am replacing the compressor, receiver/drier, orifice tube, rear expansion valve and the O-rings for all the joints that I could get apart.

1. To lubricate the new O-rings, what kind of oil do I use? I've seen some places say to not use PAG oil and to use R-12 ester oil instead. Is this true and why?

2. The spec for oil capacity is 11 oz., where exactly do I add it? Do I put all 11 oz. in the compressor? Or do I put some in compressor and some elsewhere? If so where?

3. I read that I should use PAG 150 oil, is that the correct oil? Do I add all liquid oil, or do I use some of the oil charge cans?

Thanks and have a good one!

 

[SunlitComet]

use 525 viscosity mineral oil for orings and fitting threads only.
use pag-150 oil in a r-134a refrigerant system only.
1oz condenser
3oz evaporator
3.5oz accumulator
2oz in the compressor and the remaining in the rear evap.

the system must be completely flushed first.

and do not use refrigerant with stop leak additives in it.

 

[Sparkee]

Thanks for the help! Where can I find mineral oil? The local auto parts stores (O'Reilly, AZ, etc.) don't have it. Would a hardware store have it and if so, what section might it be in?

I have already flushed the whole system, that took a while to break open the joints and flush everything forwards & backwards. I heard to not use any leak sealer chemicals, I have been avoiding those. Thanks again and have a good one!

 

[electro]

use 525 viscosity mineral oil for orings and fitting threads only.
use pag-150 oil in a r-134a refrigerant system only.
1oz condenser
3oz evaporator
3.5oz accumulator
2oz in the compressor and the remaining in the rear evap.

the system must be completely flushed first.

and do not use refrigerant with stop leak additives in it.

Sunlit is it then wrong to say that the compressor will come fill from manufacture with proper amount of oil for the system?

Meaning, the bulk of the oil sits in the compressor and some will then cycle through the running system with the refrigerant????

 

[SunlitComet]

Thanks for the help! Where can I find mineral oil? The local auto parts stores (O'Reilly, AZ, etc.) don't have it. Would a hardware store have it and if so, what section might it be in?

I have already flushed the whole system, that took a while to break open the joints and flush everything forwards & backwards. I heard to not use any leak sealer chemicals, I have been avoiding those. Thanks again and have a good one!

try any a/c repair shop or dealer.

---------- Post added at 11:19 PM ---------- Previous post was at 11:17 PM ----------

Sunlit is it then wrong to say that the compressor will come fill from manufacture with proper amount of oil for the system?

Meaning, the bulk of the oil sits in the compressor and some will then cycle through the running system with the refrigerant????

yes. the oil is separated from the compressor and there are warning tags to notify you. not everyone needs the same oil quantity in the compressor depending on the repairs done. it all gets dispersed throughout the system.