Posted 7/2/2009 08:14 (#763223 - in reply to #762638) Subject: RE: How long do you leave the vacuum pump on the a.c. unit?
I was always told you should pull it too a certain amount on the gauge. I don't recall what number now as my air operated pump won't pull as much as a real pump. My old 1135 tractor several years ago wouldn't keep freon in it long enough to run more than a couple hours. I pulled a vacuum on it a left the gauges on for about 24 hours with no change, but wouldn't hold freon. The compressor seal would only leak when the compressor was running.
How long do you leave the vacuum pump on the a.c. unit?
