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850 evaporator replacement - how much AC oil to add? 850

Got the evaporator replacement job done, changed the drier, heater core etc.
Volvo dealer wanted $200 and Firestone wanted $250 plus MD taxes to evacuate system and refill. Thought that was kind of expensive and decided to buy the tools necessary to do the job myself. Vaccuum pump and gauge set was around $100.
Evacuating the AC system was pretty easy and it held the vacuum for about 30 minutes without the needle moving, so I charged it.

Question now is how much AC oil have I lost by replacing the evaporator and drier?

So far I have charged the system with 24 ounces and 2 ounces of oil. The sticker on the vehicle says 1.63lbs is the system capacity, which is 26 ounces.

Any suggestions?

Robert






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