A/C compressor oil level

So the way this works is you pull the system down into a vacuum to recover the oil and refrigerant.

Here is a guide that will help with this:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Then if you are replacing parts, then you need to put the amount of oil shown on the list below to replenish the oil that was still in the component as not all is pulled out.

However, if you drain the oil out of the old part and it was more then what is listed below then you add that amount and not what is on the list. In other words, which ever is more.

Please run through this and let us know if you have other questions. Thanks

Not a silly question at all. Yes. That is exactly it. It only pulls it down to about 10-30 inhg (inches of mercury is how vacuum is measured).

So basically it is not able to pull it all out so they have figured out that about this much oil will remain in the component so if you replace that part, then you need to put that amount of oil back in the system due to it being removed with the component.

So you would add that much oil to the amount of oil that came out when you recovered the freon. So if you get 40 ml back in the recovery and you replace the compressor and accumulator, then you would but the 40 ml back in plus 120 ml more for a total of 160 ml of new oil (don't reuse the oil that came out).

The only exception to this is when you drain the component and get more then this spec out of it. So if you drain the compressor and get 65 ml out of it, then you would put 165 ml back in (40+60+65=the 165 ml).

Let me know if you have other questions. Thanks