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Old 01-06-2001, 06:29 PM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
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What exactly does the thermo vacuum switch do?(first switch by the top front of the engine/valve cover with two vacuum lines attached to it) and, how do you test it? I can not find the info on it and, I think mine is the name itself, I suspect it applies/cuts vacuum to ? at a certain temperature.

'86 300E
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Old 01-06-2001, 08:44 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
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You are correct in your assumption. On the side of the valve in very small print is the open/close temps. There is no in or out. It is rather open or closed. It should do the opposite at the open/close temp points.
Donnie Drummonds
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Old 01-06-2001, 09:16 PM
J.HIDALGO's Avatar
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Thanks Benzmac! but, what does it control? or, in other words, if it does not work. How is the engine performance affected?
'86 300E
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Old 01-07-2001, 08:44 AM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
The thermo vacuum switch on mercedes diesels let the car make more stationary rpm's during a short period of the engine being cold. After a short time the engine gets gains a little in temperature and the vacuum switch closes and the stationary rpm's get less.
I do not know whether the purpose of a vacuum switch on a 300E is the same.

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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