wrote in message
...
OT, but much more technical that the various spam postings of late.

I need to swap out the condensor & receiver/dryer on my wife's car
after a tube clip chaffed thru a condesor tube. I do not own a vacuum
pump (and did not think of searching Craigslist & e-Bay a couple of
months ago to buy a vac pump) and I have not found a local place to
rent one. I see very cheap (under $20 new) pneumatic pumps driven off
of shop air, about 4 CFM air use. Has anyone here have experience
using one of these? Do they pull a good vacuum ( I have seen
notations of drawing 27 inches Hg of vacuum). How long does one need
to run such a vac pump to draw a good vacuum? I realise I could just
take the car to an A/C service place and have them recharge, but I
will be adding A/C to a couple of project cars next year and owning an
vac pump could pay for itself.

I have a set of R12 A/C manifold gages. I think that there are
adapter fittings to convert this over to a 134A use. Anyone have
experience in using the adapters?

1. I am not a refrig tech nor do I offer legal advice. That said:
2. I have had good luck just swapping over from R12 to R134 - put adapters
on the fittings add some proper oil and fill
3. I have had no problem with systems that were open to the air for a short
period of time - but it is dryer here than in some places - I have
repaired/refilled systems and then run them for ten years without further
problems after a burst hose
4. harbor freight has an inexpensive R134 manifold set - I think it's on
sale now - about $50


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