After cleaning up my ice-cube relay wiring job (shortened the wires and made a decent under-hood fit) I spent time driving my '87 300TD with AC on to see what type of readings I would get at the vents. Using my digital multi meter with temp probe, I got a sustainable low temp of about 47-48 degrees at the center vents. Ambient temps during my trials ranged from just over 80 to mid 70s (most of the time). With AC on the engine temp was primarily just over 80. Idle, of course, resulted in the vent temps to climb but no more than I would expect. Though I am going to eventually complete the task of finding (expecting the compressor clutch gap) the problem, solving it and getting a Klima back in, I am thrilled with the help/results. I'll keep you posted.

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Steve
'87 300TD - 132K - Soon 4-Sale
'84 300D Turbo - 122K - Driving
'77 VW Type II - 77K - Restored
'08 250EX Ninja
English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms.