David Lithgow > 1985 Ford Bronco > open folder R134a A/C Conversion > central_pneumatic_vac_pump.jpg

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central_pneumatic_vac_pump.jpg I left the old accumulator in place for the next step. Evacuation. I used the Harbor Freight vacuum pump ($19.99) to pump down the system. First you hook up your manifold guage set(+/-$100.00) then you run the yellow hose to the vacuum pump. Turn on the vacuum pump then open both valves on the guage set. My 5.5HP, 30gal sears compressor would produce 29" for about 5 minutes then drop to 27" which I left on for 30min. That will boil most of the moisture out of the system.
central_pneumatic_vac_pump.jpg | Hits: 753 | Posted on: 6/29/03 | View original size (101.83 KB)

I left the old accumulator in place for the next step. Evacuation. I used the Harbor Freight vacuum pump ($19.99) to pump down the system. First you hook up your manifold guage set(+/-$100.00) then you run the yellow hose to the vacuum pump. Turn on the vacuum pump then open both valves on the guage set. My 5.5HP, 30gal sears compressor would produce 29" for about 5 minutes then drop to 27" which I left on for 30min. That will boil most of the moisture out of the system.