Average Reviews:
(More customer reviews)This low cost solution to vacuuming an a/c system is a viable option. I was somewhat skeptical being an old a/c mechanic and having always used a robinair high vacuum pump. In a pinch, I needed a low cost way to vacuum and auto a/c system after replacing some o rings so I purchased one of these and was amazed first that it even worked and second that it produced adaquate results to allow me to recharge free of enough non-condensables to get by. The very reason for vacuuming is to remove moisture, air and any substances that are non-condensible within the a/c system. If not removed these non-condensables reduce the performance of any a/c system or even stop it from working.
Now the performance wasn't up to what I could get with my trusty Robinair, but was satisfactory. The water column it pulled was about 23 inches on a my gauges. (My robinair will pull down close to 28 inches). (I think a perfect vacuum is between 28 and 29 inches of water column on a manometer).
I would recommend this if saving money is crucial and you need it for a small job where you don't plan to use it every day. If you leave it running for a half hour or so it should boil off all the water and most of all the other non-condensables inside the system.
Hope this helps.
Click Here to see more reviews about: Robinair 34970 Dual Inlet Air Vac For R-12 AND R-134A
The AIR-VAC is a Venturi-type vacuum pump powered by compressed air and designed for mobile air conditioning service. For R-12 and R134a automotive use. Low maintenance.
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