I agree, it should be covered; each time I go in there, they act like they don't remember the prior work. Losing confidence in their actual knowledge of AC systems. High pressure on the low press side perhaps suggests problems with the orifice tube? Also 150 on the high side seems low compared with ...

Ok, been back to the dealer for pressure test. Readings were: static pressure 86 psi; high side running 150 psi; low side running 68 psi.

dealer is recommending evac and charge ($189) as next step. Does this mean it's low on refrigerant?

Sorry, I don't have that information. I can take the rig back to the dealership, I suppose and get more information. I was hoping folks on this site could either rule out the compressor as the problem or suggest yes it could be due to differences in compressor design or performance.

I have a 1998 Tahoe, 2 door, 5.7 liter. Owned since new and A/C always ran very cold. Year ago, it stopped getting cold, took to dealer. Refrigerant was gone and compressor was bad. They replaced compressor with aftermarket model (at my unfortunate insistence to save $; I think it's a Murray 58950)....