Dave:
I recently acquired a 1989 300E with 127,000 miles. The blower fan never seemed to go on high, but knocked softly instead. The knocking has stopped, but no high fan. I've been investigating that problem and today pulled the glovebox to see what I could see. I noticed that the pod behind the glovebox (you said it is for the defrost) does not activate unless I push the metal connector in a bit. Once in (when on a/c or economy) it will go back up as long as I do not let it go out completely (i.e. by putting the system on defrost, bi-level or off). Once all the way out, it will not go back in. Think this is a vacuum problem?
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Jim Wiggin
Columbus, OH
1989 300E
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