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Posted by William Noble on April 25, 2008, 2:27 am
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> 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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>
> 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?