why does my A/C on blow through the defrost? on 2000 Ford Mustang

Why does my A/C only blow through my defrost no matter what setting its on? it blows hot and cold but only through t he defrost.

by in Buchanan, GA on June 08, 2010
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2 answers
ANSWER by , June 08, 2010
there is a small vaccuum line under the hood back by the firewall in the center that may be off or broken. Roy
ANSWER by , August 09, 2010
maybey becuse the battery is low cuse my did thate 30 miutes latere just cahrge battery man