Car vent selector not working

1997 MERCEDES BENZ C280
180,000 MILES • 2.8L • 6 CYL • AUTOMATIC
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KINGGEO JAMES
  • MEMBER
  • 1 POST
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
Jan 25, 2018 at 7:32 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,176 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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Jan 26, 2018 at 10:37 AM
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