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Tool Talk Discussion Forum

Re: Air operated vacum pump ?

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JD Seller

06-02-2013 09:20:57

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I have one I use on my service truck all of the time. I am not worried about it not getting all of the moisture as I always use a AC flush that contains alcohol. I blow it through the lines first. The alcohol will help the vacuum get any water out. I have used it for twenty years and never had an issue.

I like the "experts" saying this and that will not work. It is kind of like the R12 and R134 issue. When they first changed we went to great lengths to flush the systems and change the compressor oil. Now I just replace the re-dryer and vac the system and charge them on these old tractors. Not had any issues there either. I bet that I have done a hundred that way.

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06-02-2013 13:38:49

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 Re: Air operated vacum pump ? in reply to JD Seller, 06-02-2013 09:20:57  
JD, help me to understand how flushing with alcohol is going to remove moisture. After all, you can only distill isopropyl alcohol or ethanol to around 90-96 percent pure. Flushing with alcohol is going to ADD water to the system, not remove it.

Backing up a bit, how does water get into the system in the first place? You opened the system, and humid air entered it. OK, so you displace the air with your flush, which evaporates, leaving you with a system full of vapor that's 4 to 10 percent water. How do you get THAT out? My guess is you blow it out with compressed air, which leaves you right where you started: an A/C system full of wet air. (Now if you purge it with dry nitrogen, then that's another story. But the flush would still have not aided the process.)

Fact is, if you're not drying the system by pulling a solid vacuum (1000 microns or less), you're betting that the dryer will do it for you. Which you can probably get away with, IF you replace the dryer.

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