When adding refrigerant to a running system using cans, I understand how to crack the yellow hose and purge it. But what about the blue hose? How does one purge it of air?
If you are charging into vacuum, the blue hose is under vacuum. If you are "topping off", I guess you could crack the blue hose at the manifold and purge just like you do the yellow hose. Or maybe adding the air from the blue hose is just the sacrifice of "topping off".
If you are connected to the vehicle, you would refrigerant pushing air up to your manifold so you'd crack it there. I have H/L side connectors with manual Schrader valve depressors. I leave them closed, a Tee fitting with two ball valves on my center yellow hose. One for refrigerant and the other for my vacuum pump to pull all hoses, manifold, etc down into a vacuum. Open the Schrader(s) when needed.
I think purging by cracking a hose isn't a surefire method of removing air from the hoses and manifold. The less air the better!
Edited: Thu July 31, 2014 at 9:49 PM by wptski
So you leave the manual depressors on the high and low closed and then just pull a vacuum like that on the hoses and that gets all of the air out? Afterwards just close the ball valve on the yellow?
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