the problem is when the baffles move from heat to ac and vent to defrost they either get stuck or the controllerr is bo. this system is built to fail safe in the defrost mode. Thus ac comes from Defrost vents. Apparently it is wide spred with Ford and Chev. As it is in my 2001 Ford F-350, My opinion To much Matel Toy company plastic and cheep parts we pay considerable money for from the dealers. 1) check your controller at the dash probably vacume 2) check the acutator at the butterfly flapper. Some vehicles are easier than others.....
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check the alternater Something to do with your electrical in your vehical so i think you should get that checked out right away or just don't use your ac or defrost and your vehical should be ok..
If you have the defroster on, the ac comes on automatically.
Check for vacuum leak either under hood or under dash Check for bad vacuum actuator under dash Defrost is the default setting
Buy a kit at Wal-Mart or auto parts comes with instructions
A vacuum leak, or one of the doors is sticking/bad vacuum motor in the heater box.