95 Chevy G20

[Gladiator]

Yes the compressor noise goes away when the a/c is shut off. It didn't sound this bad when I filled it up the first time to find where it was leaking.

I will have to call them, it doesn't say on the receipt how much oil they added.

The low pressure port is on the accumulator on this model, which gets pretty cold, would that skew the results since it's not at ambient?

I'm just going off what I'm seeing here for 90f, I've seen most of the others say the same thing.

[bohica2xo]

I always cringe when I see that chart. But it will not go away - thanks internet.
I think it originated in what we call a death kit. For half-baked R12 to 134a conversions.

You can't charge to those pressures, the system is too dynamic. With a proper charge level weighed in you might see those numbers under a full load test - but not at idle.

Did you pull the orifice tube on the front system & inspect it when you serviced it? Was the accumulator replaced?

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[Gladiator]

I only replaced the rear drier, there was probably residual oil left in the system after they did the vac since it wasn't flushed and when they added more oil, there's probably too much oil now