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Old 12-16-2012, 06:59 AM   #1 (permalink)
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98 c230 center vent eradic

wondering why center vent comes and goes mostly gone now only end vents working ?
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Old 12-16-2012, 02:48 PM   #2 (permalink)
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It probably changes due to engine speed and whether you are accelerating or not. All your dash vent doors are controlled by the vacuum system and the bellows leak over time. As the vacuum changes with the engine, the doors open and close on their own. Take a looksee here to see what it would take to fix them: Link to dash teardown Mine does the same, have yet to muster the courage to tear the dash apart to fix it.
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Old 12-16-2012, 03:15 PM   #3 (permalink)
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Yeah Thanks,I wonder how to prove it is a leak at bellows or at a line connector ? before it routs under dash I would think a leak anywhere in that line would cause the same symptom before tearing out dash.Any thoughts ?
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Old 12-16-2012, 05:09 PM   #4 (permalink)
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C230's with the manual/rotary dial system do not have the bellows like the cars with the automatic push button type system. The rotary dial for vent selection manually moves the levers that open/close the vents.

What type of system does your car have?
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Old 12-17-2012, 07:22 AM   #5 (permalink)
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Automatic climate control
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Old 12-17-2012, 07:57 PM   #6 (permalink)
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You most likely have a vacuum leak in the engine bay. that is the same thing that happened to mine. I had to replace a few vacuum lines that were cracked.
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Old 12-18-2012, 10:44 AM   #7 (permalink)
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That makes sense.Thanks
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Old 12-18-2012, 01:24 PM   #8 (permalink)
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If you pull apart the cover inside the right hand side of the trunk there is a vacuum box. I found a few disconnected hoses and it fixed the problem. It also made my rear head rests go down.
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Old 12-18-2012, 05:09 PM   #9 (permalink)
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Thank you also,more great information.So much for Christmas shopping,Saturday will be spent tracing vacumn lines under hood and in the trunk.Thank you both Ill let you know what I find.Tow
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Old 12-18-2012, 06:23 PM   #10 (permalink)
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There is also a vacuum resivoir in the right front fender well. To access you have to remove the wheel then the inner fender plastic liner.

Last edited by rudedude; 12-18-2012 at 06:35 PM.
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