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How much oil to add?

mclovin on Sat October 27, 2012 7:31 AM User is offline

Year: 1997
Make: Toyota
Model: Camry
Engine Size: 2.2 L
Refrigerant Type: R134a
Ambient Temp: 50 F
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

Hello,

I'm replacing the engine on my 97 camry, so might as well do the AC as well. I took everything off but the evaporator and put it in the trunk, put the hood back on and stuffed a rag in the ports of the evaporator as I don't want any rain/moisture gettin in there. Gonna replace every O-Ring with an HNBR set I ordered, evacuate the system to 29.92 (what my vacuum pump specs are) InHg, and add PAG 46 and this Sub Zero Synthetic Booster (2oz which says it contains PAG, not ester), and recharge with the exact max amount of R134a. I am also going to replace the reciever/drier

My question is, exactly how much PAG should I add, and should I add this synthetic booster stuff? I have added it to my 96 camry before I totalled it, and it was like 50 in the car when it was 106 outside a couple of years ago on MAX A/C. Should I just drain the compressor and add fresh since I have it out? I got everything removed, and notice there's a little bit of oil in everything. Not sure how much is in the evap, as it's still in the car. How much oil should I add? I'm replacing the reciever/drier, and saw a guide with a compressor on how much that holds, think it's about 1oz. The synthetic booster stuff (which is basically PAG with synthetic oil molecules that help lubricate the rings of the compressor, like zMAX per say) is gonna be 2oz of PAG, not sure what viscosity.


Thanks!

Edited: Sat October 27, 2012 at 7:39 AM by mclovin

iceman2555 on Sat October 27, 2012 11:49 AM User is offlineView users profile

Question? Why would you wish to utilize the 'Tech in a Can' why not simply restore your ac to OE specification and remove all traces of doubt concerning what was in that can?
You have the system completely disassembled, except for the evap, so why not remove the evaporator and flush this to remove all residual (highly contaminated lubricant), flush all other components and re assemble the system. Add the correct lubricant (PAG46) and amount (8 oz) to the system. Drain the compressor, add about 2 oz and rotate the compressor several dozen times and drain the compressor. Refill with 3 oz of lubricant. Add app 1 oz to the rec/drier and the remainder into the evaporator.
Evac and recharge to OE weight.
Good luck!

-------------------------
The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

Z2TT on Fri February 22, 2013 5:50 PM User is offline

There is no way to know how much oil to add without flushing every single component, draining the compressor and then putting in the Required amount of oil as per OE Specs, half of it or so in the compressor and rest in the remainder of the system.

The other more risky way is running the system for 15 minutes or so at idle, then turning off, taking the compressor out and seeing how much oil you can drain.
If hardly nothing comes out e.g 2 drops, then you are seriously low on oil. However if you can drain say 30-40ml out, you are kind of OK. But remember, if you drain say about 2ml.... adding 38ml will not mean the Compressor
will have about 40ml next time you drain it, as it distributes evenly in the system, so you need to add more, and how much more you need to add.... there is no "Set in Stone" figure.

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