I had poor performance from 134 despite all new components. I figured I'd try Enviro-Safe so I tried the industrial version.

Evacuated, flushed and pulled a vacuum. Followed the directions to the letter. No joy. Compressor engaged, low side pressure 25psi, no cool air, 95F ambient, 40% humidity. Added another 6oz can just for the hell of it, 45psi low side, no cool air coming out of vents. Heater is not part of the problem, I pinched it off to be sure.

I don't have high side pressures figures. Something blocked like the TXV?

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1988 300E