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Oley,
Art is correct, your problem is the A\C microswitch, but it may be beyond needing a hard shut off.
I've had two of my cars have this problem. You will need to take apart the center of the dash so you can get to the back of the A\C switch.
Pull the knob off of the switch and remove the front cover plate, (the part with the blue and red swirl). This gives you access the locknut, remove locknut and seperate the switch from the dash plate.
When you get it apart it will become clear how the switch works. There is a lever/flap that pushes in on the switch when knob is in the off position.
The lever/flap needs to be adjusted, I use a pair of needlenose pliers to slightly bend the lever. It should click just before the off position.
What you may not have realized unless you have a tach is that when the fans kick on the rpm's automatically increase from 750 to 900 to compensate for A\C load. With the switch out of adjustment, the car thinks the A\C is on.
I just fixed this problem on my 84 245, and I think the rpm increase was killing my mpg. I'm in the middle of a mpg test right now and it looks as if I may have an increase.
--
Bruce S. near D.C.
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