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Old 07-18-2007, 09:52 AM
AUBluTiger
 
Join Date: Jul 2007
Posts: 70
R107 1976 450SL ANOTHER vacuum question

Okay...how does this freaking vacuum system work? (in simple terms!) I am familiar with the VW/Audi system..which is controlled by a vacuum pump in the trunk...however I am getting mixed information on the MB system..maybe because it varies with each year? Here is a rundown of my car....

The Power locks, trunk, and fuel door actuators are not working (the fuel door is unlocked, and the trunk I can open with a key). The cruise control also does not work. Now, everything else on the car works fine...transmission shifts fine...car turns off fine....(both of which I was told ran on the same vacuum system) Would or should I hear anything when I use the locks? I hear nothing...no pump, no hissing..nothing....
The car is currently at the body shop getting body work done....but would like to get feed back on other users' history/remedies.

Thanks!!! Other than that, I LOVE this car!!!!!!!

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Old 07-18-2007, 12:18 PM
Registered User
 
Join Date: Sep 2004
Location: Dublin, Ireland
Posts: 385
The vacum is create by the engine manifold and a hose is attached at the back of the engine next to the bulkhead. If you follow the brake booster line it will get you close. The hose then goes through 1 way valves and a resoviour inside the front fender before heading off to the door locks, filler plunger and trunk lock.
There's an SLC diagram in this thread that will be similar:
http://www.peachparts.com/shopforum/vintage-mercedes-forum/164518-76-450sl-any-help-gremlin.html#post1277131

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