AC evacuation question - PeachParts Mercedes-Benz Forum

leathermang · #14 04-21-2010, 01:44 PM

Quote:

Originally Posted by vstech

not if there is a leak.
or if significant moisture is present.
or if the vacuum pump is not working properly.
nothing beats a micron vacuum gauge.
best practice is to evacuate to 2000microns, break with nitrogen, and re'evacuate to sub 1000 microns then charge with correct volume of refrigerant.
sub 500 microns is even better, but not needed, unless working with POE refrigerant oil.

I am not at all arguing against the nicety of having any tools one can afford to have... the more tools the better...
I do not have one...so I have to rely on whether it will hold for many hours with no movement .... but totally agree that leak checking is only viable with PRESSURE.... so leaks should have been taken care of before vacuum is being applied anyway....