I have a 1979 300SD. The servo is not working now. If I spray wd-40 in certain openings that will get it to work, but I have to remove it to do that. I did that again this morning, which it worked after that, and now this afternoon it is not working. It is not leaking at all. If there is low vacuum, will it open and close properly? Also, could the amplifier be bad that is behind the glovebox? What should I expect to see if/when I open this monster?
Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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The servo operates with electricity, not vacuum. If you have a vacuum problem, you will have symptoms such as the fan cutting off when you accelerate. The servo opens and closes various vacuum ports as it moves in response to the demands of the controls and temperature.

The absolute best thing you can do is call George Murphy at Performance Analysis Co. (885.482.4175) and ask him to send you a copy of his guide to troubleshooting the system. It will cost you five bucks.

I would offer to FAX it to you, but it is so good, that he deserves his modest fee.

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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