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Old 11-07-2002, 07:14 PM
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Join Date: Apr 2002
Location: Portland Oregon, USA
Posts: 65
Weird Vacuum System problem? 92 300e


I have sort of an odd issue with my 92 300e involving the vacuum system...Whenever I lock/unlock the doors, the vacuum motor stays running for approx 45 sec- 1 minute then shuts off. My doors do unlock and lock fine (within 2 seconds after i turn the key in either direction), but.. shouldn't the motor (in general) be shutting off alot quicker than that? If its of any relation, i did also mention a few times, that my doors have on occasion *locked* themselves, Right after turning the ignition off (at the end of a long drive, for example).. I've only noticed this happen 3 or 4 times, and each time, it has only happened immediately after turning the ignition keyswitch to "Off"...
Could i have a vacuum leak? should i inspect the motor for de-tached hoses, etc??

Thanks for any info!


92 300e 2.6
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Old 11-07-2002, 07:40 PM
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Join Date: Feb 2002
Location: Seattle
Posts: 596
If your vacuum motor is running after it's job is done (doors locked), you have a leak.
1986 300E Anthracite + ECodes + MB Mileage Award
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Old 11-08-2002, 01:31 PM
Registered User
Join Date: Apr 2002
Location: Portland Oregon, USA
Posts: 65

is there a common area where the w124's have vacuum leaks? Should i inspect the motor area under the seat first? How hard are the door panels to get off if i have to check the doors?? (also, are there any other areas the vacuum lines go *besides* just the doors?)

Thanks for all of your help!!!!

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Old 11-08-2002, 09:52 PM
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Join Date: Sep 2002
Location: New Jersey, U.S.A.
Posts: 2,398
Check the trunk lock and the gas cap door. A good way to check is to LISTEN for a hissing sound when the pump is running. Make sure you're in a quiet place. If you hear a hissing noise, you've got a leak. Just follow the hiss to find it! Good luck
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