Thanks for the post Danny!

I managed to get a wiring diagram from a nice guy on a 190 web site in the UK. That helped ALOT! Your info helps too. After wiring the switch the compressor would come-on no matter what the setting was on the "sliding temp sensor." It looks as if the switch was wired improperly by whoever worked on the switch before. I haven't heard from my mechanic yet today, but I'm hoping that the schematic I gave him helps straighten out the problem.

I also was told that euro AC's are turned on by moving the temperature slide control up from it's lowest point, and to shut it off, you set it at it's lowest setting. It would be on a "vent" or no ac setting at the lowest point on the slide control. If that is true for your car too- then this is how mine must be configured as well. If mine doesn't work that way- we're just going to put an on-off toggle switch in it and "call it a day."

I'll check with the mechanic about the freon pressure thing too- thanks- John