[q0987]

Hello all,

Let's assume the ac compressor has the proper lubricant oil.

The steps of recharging an AC:

1> recycle the refrigerant
2> vacuum the whole system for 1 hour and also test whether the system is sealed
3> add refrigerant by weight based on the car specification

Question>
When we recharge the system, should we skip adding any more lubricant oil?
Since the old lubricant oil still persists and will not be vacuumed out by the vacuum pump, so I assume we don't have to add more lubricant oil.
Is this correct?

Thank you

 

[MERCrunner]

Some amount of oil circulates throughout the system. Anytime a component is replaced, a suitable amount of oil should be reintroduced per guidelines. Also, if you had a sizable leak, you could (and, probably did) lose some oil. Question has always been, however...just how do you determine how much was lost?

 

[Automender12345]

Unless you had a massive leak venting the refrigerant and oil off you should be good on oil. As long as the new compressor was lubricated properly. If it was me I might add an ounce of oil as safe measure..