My Center Vent is not blowing Air, What could be wrong with it


Asked by Sep 03, 2014 at 02:59 PM about the 2000 Mercedes-Benz C-Class 4 Dr C280 Sedan

Question type: General

My AC works good but the center vent is not blowing air. The air goes into defroster that causes the windshiled to fog. I can hear the blower is spinning, the climate control indicator is doing its job but the center vent is not working and it is blowing cold air on the windshield.

2 Answers


Sounds like you have a vaccuum line that has come loose that controls the air duct diverter between the defrost and normal vent opennings. I have no MB experience, but this is where I would look if it is a vaccuum controlled system.

1 out of 1 people think this is helpful.

On my 1998 C280 it was a vacuum line that had a broken connector. I replaced the connector with a small piece of rubber hose and it's now working fine. The vacuum line was near the firewall just forward of the bottom of the windshield.

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