Hey Bruce -

That's what I was trying to say - the detailed ACC wiring diagrams are missing from the CD for the 1982-on. For the earlier years, there is a massive amount of information on current and vacuum flows - different diagrams for each setting of the pushbuttons. The one diagram provided for '82 on is just a summary of current flow and ground.

My suggestion would be to call George Murphy at 865-482-9175 and see if he has some that he would send you on the chance you might buy a control module from him. If you have the diagrams, it is possible for a talented amateur like you to find the problem.

So for most of the settings, vacuum is needed to close various switches before the blower will come on. But, at least on my '81, if you hit DEF, you are supposed to get a direct feed to the AC and the blower, bypassing all of the control modules. I would think it is the same on the newer systems, so if you lose a control module you could still clear the windshield.

I think that the 2A fuse is a mistake for the '82-on, and is used in the earlier cars to allow current to the servo when the ignition is turned off - it moves to a "park" position.

I am not making this up.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe