Ok, I admit I have never had any training or need to know about A/C systems. For some reason, all of the junk I owned in the past either (1) did not have or need A/C; or (2) never had any A/C problems.

[B]I have searched here, and I have searched the manual on CD and on Alldata and do not see recommended pressures. I have an old 1989 Haynes AC manaul that lists pressures and for Mercedes '81 to '86 shows low 22 and high 265. Correct?

At 20-22 low I am showing only 150 high and the vent air is at 80+/- on a mid-80s afternoon. The high side line is hot to touch at the condensor and the low side line is cool at the valve.

I feel like this is something I should know but don't. What are the logical next steps in getting this AC back in working condition, short of a blanket removal and replacement of the Receiver/drier, expansion valve, etc. Of course, if that is the next logical progression, I need to know that, too.

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1984 300SD 326,997 miles and counting . . . No wait, my odometer is still dead