2nd Gen Non-Engine/Transmission ac oil

[SAndreasen]

how much oil should i add to the system ? changed compressor and accumulator the compressor said it has oil in it but to add what the manual says so i looked up the capacities in the service manual and it says the capacity of the accumulator is 2 oz so thats what i put in . is that the right amount

 

[GAmes]

Did you drain the oil that was in the compressor first?

 

[SAndreasen]

no i didnt the manual with the compressor said the compressor had the correct amount of oil in it. and to add to the system the amount called for in the manual so i dont know exactly what the hell that means

 

[GAmes]

I'm pretty sure it means 2 ounces total, not to add two additional ounces. I recall that when I had my compressor replaced last summer (with a new OEM) that the tech told me he drained it, then measured the oil that he installed.

 

[Tuesdak]

Most compressors do NOT come prefilled with oil and this is where the confusion comes from.

Looks like you got a genuine Sanden unit? These come prefilled with the correct amount of oil.
The instructions include replace the accumulator, OT, and flush the system?

Thus you will have no oil in the system, because you flushed the old oil out, except the system capacity 7.75 oz of oil prefiled in the compressor.

If you added 2 oz of oil you need to remove 2 oz of surplus oil as that will hurt AC performance.

Edit: aftermarket compressors DO NOT come pre filled with oil so you have to add it. If you didn't flush the system you will have leftover oil especially in the evaporator that will hurt performance from too much oil in the system.

 

[DavidC]

One of the checks I do when changing the compressor involves 2 Dixie cups (can I say that, Dixie I mean). I drain the old and the new into each cup, make the new match the old and pour it back in.

Dave

 

[Tuesdak]

One of the checks I do when changing the compressor involves 2 Dixie cups (can I say that, Dixie I mean). I drain the old and the new into each cup, make the new match the old and pour it back in.

Dave

If the system is low on oil - there is a minimum amount you pour in regardless of what you get out. Dry compressors should have a chart on how much to add depending on how much you removed from the old compressor. Systems don't just leak freon - they leak oil too. Water washes off the AC oil. A pre-filled compressor will over oil the system as it has the entire system capacity of oil in it. AC recovery systems also unintentionally remove and then dump oil into a measured container. So make a note of how much oil came out when recovering the system.

Again the best way to remove wear particles and be 100% of the correct oil is to flush the system and add a full oil charge. 2nd best is measuring the oil from the old compressor and seeing if it's "low". All other parts have a 'add this much oil oz when replacing this part.'