OK, so we just this morning got the last of the four pods in the car (after I've been driving the grandparents Grand Marquis for two full weeks because our explorer's transmission died the day after we took the mercedes off the line )

3/4 of them work flawlessly.

The "defrost" pod does not respond to efforts to make it activate.

It does, however, work perfectly when we manually operate it with the MityVac on the line going into the little junction block thingie.

How do we diagnose whether the problem is a nonfunctional part of the 7-hole vacuum block or if it's a problem in the electronic pushbutton box for the climate system?

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL