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Old 09-19-2000, 02:28 PM
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Join Date: Oct 1999
Location: Culver City, CA, USA
Posts: 62
My vaccum locks have been actin up as long as I had the car, a 1978 300D (123 chasis). I finally broke down and tested the system. The pump put out a nice vaccum. The doors are not leaking. The cruise controll is disconnected and not leaking. The pump shut of actuator is not engaged untill the engine is turned of, so no vaccum leak there.
THE only thing that leaks is the green line, which is the climate controll. With the line plugged into the system I can only build up 5-9 inches of vaccum at idle. With the line disconnected I can build vaccum at a rate of about 1 inch per 10 seconds, at idle.
What is the most likely place to start looking for leaks on the climate controll system? The vaccum switches?

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Old 09-19-2000, 05:24 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Rubber vacuum elements that are 20+ years old & plastic vacuum lines that run next to the battery are all suspects!!

27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar
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Old 09-19-2000, 05:32 PM
Registered User
Join Date: Oct 1999
Location: Culver City, CA, USA
Posts: 62
thanks for the reply. I thought there might be a "this is usually what breaks" type answer. I guess I will have to break out the diagrams and 'git' to work.
One thing though: the lines next to the battery are all rubber hoses. It seems someone changed them before me.


P.s. Am I on the right track with the vaccum system or did I miss someting obvious (a.k.a. make a stupid assumption) ???

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