2002 Chevy Tahoe

I have a 2002 Chevy Tahoe that for some reason does not have heat in the front of the truck but has heat in the back. It is made with duel climate control and the front does not work. The blower works but just blows out
cold air...WHY??? The rear unit which is controled by a dial on roof of the cabin above the console works fine but the front doesn't.

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