Car vent selector not working

KINGGEO JAMES

MEMBER
1997 MERCEDES BENZ C280
2.8L
6 CYL
AUTOMATIC
180,000 MILES

When I press the vent selector button, it does not change. The vent is always blowing on the windscreen and front vents only. So during the summer when I turn on the A/C, my windscreen starts to freeze up because I cannot change it from the selector.

Thank you,
Geovanni

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hello,

The system is run by vacuum I would start by checking the vacuum line under the hood to see if there is a break in the line which will cause the problem you are describing.

Here is a guide and a diagram (below) to help you see whats going on:

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Please let us know what happens.

Cheers, Ken

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