The A/C compressor on my '87 300D turbo seems to be on all the time, even when the ACC is set to Econ. The only time it isn't cycling is when the whole system is shut off (button furthest to the right is depressed.) The compressor itself cycles on and off properly so it doesn't appear to be a short to the compressor clutch. Everything else works perfectly; heat, cold, maintains set temp., etc. This isn't a big deal except that I seldom need A/C here this time of year and it's kind of a waste to have it on all the time. I'm not sure where to start with this problem.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold