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Just did my R134a A/C conversion... question.. (archive)
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Posted by Don C on May 20, 2001 at 21:04:09:

Does anyone have the low and high side pressure readings I should be getting.

The system was holding pressure, but was not as cool as I expected with 2 cans of 134a in there.

I was working with a relative that has a vacuum pump and is in heating and cooling, but is not that familiar with the 134a used in
automobiles.

We were running approx 38 to 40 psi on the low side and 250 or so on the high side. The new high side switch never cut the
clutch off on the compressor that I could see.

Any info on pressure numbers or otherwise would be great!

Don C

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