PeachParts Mercedes-Benz Forum - View Single Post - Will external vac. pump for AC system vac oil out??

JimmyL · #4 03-02-2009, 01:50 AM

R12 or R134a?? Neither. Freeze12, hence the ester oil.
I flushed evap and condenser [they were very clean], replaced rec/dryer and exp. valve. The expansion valve was my leak source as I saw the oil bubbling out the side after I charged it upon first purchasing the car.
There was a very cracked and hardened o-ring off the larger of the two condenser fittings, so that might have been leaking also.
Compressor was already a fairly new Delco my neighbor had installed. I did NOT remove the manifold lines at the compressor, but busted them open most other places and replace and nylog'd o-rings.
I added half the oil in the new rec/dryer and half down the low pressure hose prior to compressor, right at the fitting by the top low side schrader fitting. I've done it that way a couple of times before. I always spin the compressor first for multiple revolutions so it doesn't slug.
Works for the non-professional.
The vac held for over an hour, so I installed one can of refrigerant and that pressure has held exactly for 3 hours now. We'll hope it is the same in the morning.......