The shop tested the system and found a low charge. It didn't require much and they put in what was necessary for free. I figured they had not gotten the correct charge when they replaced the compressor and the owner probably thought the same but he wondered if there was a leak somewhere. We shall see. Its working fine now.

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)