AC Recharging with oil? - Lexus IS Forum
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post #1 of 2 (permalink) Old 09-09-2018, 11:57 AM Thread Starter
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AC Recharging with oil?

I am soon to be completing a ac evaporator replacement and after what it took just to get to the receiver/drier, I have also opted to just replace the entire condenser.

That being said, I have now replaced the ac evaporator and condenser. I see a lot of posts that state you only need to add oil if you change the compressor and some that say to add oil regardless and some that say that freon has oil mixed in with it already so you do not need to add oil at all. I've also seen some posts that state to add an ounce for each major component you replace, which seems like too much oil if, from the research I've done, most of the oil is residing in the compressor which I am not replacing.

My questions are:

1. Based on the components I've replaced (evaporator and condenser), do I need to add oil or not?
2. If oil is needed, how's that done? I haven't found any posts that give specific instructions for adding oil to the system, just posts saying to add it.
3. Plus there is no way for me to know exactly how much oil is already still in the system (no dipstick, etc), so how would I know how much to add without adding too much or too little?

Also, I do have a 3 port gauge set and vacuum pump if that can be helpful in adding oil.

Thanks in advance for any help in answering my questions.
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post #2 of 2 (permalink) Old 09-21-2018, 11:04 AM
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Depends. Did you just let the 134 blow out suddenly. When you took the system down? If so add oil. If you did it slowly. It probably is fine. If you use the 134 cans for recharge and top off. It has a small amount of oil in it.
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