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Q: A/C vent problem on 1998 Buick LeSabre

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I have a '98 Buick LeSabre with an A/C problem. When I turn on the A/C in my car, sometimes the cold air doesn't blow out of the vents. The air is sometimes directed through the defroster. Any ideas on how this can be fixed?
(5) Answers
Safely rise front right side of the car. Take a look under the car's fender - under fender, front of the tire. Check the VACUUM line leading to the small TANK . If the rubber connection to the tank is broken or leaking, fix it.

You do not have enough under pressure in the system. When idling, air goes to windshield and legs (default setting). With more RPM, more vacuum, your AC works sometimes.
Regards, ZU
it MAYBE your B C M COTROL MODULE IT CAN BE REPAIRED ,BUT TRY AND FIND A USED ONE AND CHECK FOR A BURNT CURCUIT ON THE BOARD A BAD BCM WILL MAKE YOUR CAR DO CRAZY THINGS OR IT IS THE CLIMATE CONTROL HEAD WHICH I WOULD CHECK FIRST ,U CAN BUY A USED ONE CHEAP PRE TESTED