Vent controls not working properly?

2005 MERCURY MARQUIS
200,000 MILES • V8 • 2WD • AUTOMATIC
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LINDA FRANK LUSTER
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Automatic temperature control everything works except the vent controls will not switch off of the dash vents. So, floor, floor/defrost or just the defrost has no air coming out. It is a 2005 Mercury Grand Marque.
Oct 18, 2022 at 10:54 AM
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STRAILER
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So, this happens when the small vacuum line under the hood breaks.

Here is a guide to help you find and fix the problem:

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

Let us know what happens and please upload pictures or videos of the problem.
Oct 18, 2022 at 5:58 PM