vacuum tubes i think - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 01-29-2007, 09:03 PM Thread Starter
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vacuum tubes i think

i was just pulling out the seat on my 280c (74) and i noticed that there is a bunch of blue tubes running all under the carpets. some even go to the seats. what are these. if i pull them off will they affect the performance of the car. any advice will be greatly appreceated. thank you
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post #2 of 4 (permalink) Old 01-30-2007, 07:19 AM
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Yep, they are vaccum tubes. They attach to the diaphrams on the bottom of your seat - mine are long since non-functional, but I think they allowed for easy pushing of the seat forward so passengers could get in the back seat easier. No big deal, a purist would probably want to fix it, but I'm too busy driving mine to care.

I just capped off the lines to be on the safe side, you really don't want any vaccum leaks if you can avoid it.

Good luck!
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post #3 of 4 (permalink) Old 01-30-2007, 07:49 PM Thread Starter
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but if i disconnect them and leave them like that, will it do anything to the performance. thanks
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post #4 of 4 (permalink) Old 01-31-2007, 03:41 PM
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Blue lines (and blue striped lines) are seat lock lines and are part of the safety feature of your Merc.
When doors are closed (light switch is also vacuum switch) seat backrest is locked into upright position and in case of any collision it will prevent passenger from the back seat flying out right trough your windshield.

Purist or not... it's your choice.
It will affect performace to a small degree since if line is open it will allow more unmetered air to go into intake manifold. If decide to decapitate this feature, sugest to plug it under the hood (and disconnect feed)
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