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Why whenI turn on the a/c and one side blow cold and the other side blow hot air

(1998 Buick Park Avenue)
in Los Angeles, CA on August 31, 2013
The ac blows cold on driver side and hot on passanger side why is that so..
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Popular Answer
YOU MUST HAVE A DUAL ZONE SYSTEM , CAN BE SEVERAL THINGS , MOSTY IT IS THE HEAD UNIT, OR THE SERVO MOTERS GOIN BAD THAT CONDTROL THE BLEND DOORS.
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