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how much oil to add after repair

commuter on Sat July 03, 2010 10:04 AM User is offline

Year: 1999
Make: toyota
Model: corolla
Engine Size: 4 cyl
Refrigerant Type: 134a
Country of Origin: United States

ok i have a 99 corolla factory 134a compressor was noisy. I am replacing with a new Denso unit, expansion valve, and reciever drier. It says to empty old unit and measure oil and empty new unit and measure what is in it also and if there is more in the new one than what came out of the old unit to adjust to same level as old unit. When i emptied the old unit only about 1 oz. came out and then only 2 oz. out of the new unit. I researched total capacity which is 7 oz. My question is i just want to make sure how much additional oil i should add ? I have flushed out the system also. thank you in advance Tom

TRB on Sat July 03, 2010 4:40 PM User is offlineView users profile

It's all a guess when you don't flush the system and start with the proper oil specification. You are likely to have an ounce in the condenser and evap. That would leave 4 to 5 ounces. I don't like the guessing approach! Somewhere in the 4 to 5 ounces if you are replacing the comp, drier and exp. Quick note, unless the system is flushed and fresh oil is used! Most compressor manufactures will not honor a warranty if the compressor fails.


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commuter on Sat July 03, 2010 9:52 PM User is offline

Thank you. I did flush the system and replaced the compressor,drier and expansion valve. Since the new compressor had two ounces in it after i put in on a vacuum i sucked in a couple more ounces on the vacuum and the 134a i used had synthetic oil in each can so i believe i should be around the original 7oz. mark as per factory spec. Finished up and down to 40deg. So far so good !!!!!!!!

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