How hard is it to fix/replace the vacuum reservoir? - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 09-05-2005, 06:07 PM Thread Starter
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How hard is it to fix/replace the vacuum reservoir?

The vacuum reservoir in my 250C obviously has a leak. The central locking for the doors, trunk lid, and fuel door will only work for about the first minute after I shut the car off. After that, locking the driver's door doesn't lock or unlock anything else.

The owner's manual says that the reservior should hold enough vacuum to be able to activate the central locking system about eight times after the car is turned off. Further, I would suspect that the system is designed to hold a vacuum almost indefinitely with the car off, since it appears that a constant vacuum is required to keep the fuel-door locking pin in the extended (locked) position.

Also, would a leak in the vacuum reservoir cause a leak in engine vacuum, or is there a "one-way" type of isolation valve in the system?

I haven't seen the reservoirs in anyone's parts catalogs online, or seen them on eBay. Is this part still available from Mercedes, and how big of a pain is it to repair/replace?

Thanks,
Scott
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post #2 of 4 (permalink) Old 09-08-2005, 10:25 PM
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RE: How hard is it to fix/replace the vacuum reservoir?

How do you know it is the reservoir leaking? The check valve in the vacuum system near the engine frequently leaks. You could also have a leaking pot or cracked line. You have to isolate different segments of the system to see where the leak is located.
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post #3 of 4 (permalink) Old 09-09-2005, 09:10 PM Thread Starter
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RE: How hard is it to fix/replace the vacuum reservoir?

You're right - I wasn't quite clear on how the system operates, so I'm going to get a vacuum pump/gauge and start working backwards from the engine. Hopefully it will be the check-valve under the hood, rather than anything more complicated.

Scott
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post #4 of 4 (permalink) Old 09-12-2005, 01:20 AM
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RE: How hard is it to fix/replace the vacuum reservoir?

I have lots of mercs here and NOT ONE has leaking reservoir,I have seen them damaged in collisions etc ,but never leaking.[:)][:)][:)]
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