how do you get air to come out of the vents I select on 2000 Mercury Cougar

my air was blowing out of the vents i selected, today it was stuck on the defrost vent select

by in Troy, AL on April 26, 2011
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1 answer
ANSWER by , April 26, 2011
A vacuum leak has occurred - possibly under the dash. Have a look for an obviously disconnected hose.