Why does my '98 Buick Century only blow cold air from the defrost?

I've only had my century of no more than two years, Are 130,000 miles on it. I turned on my air conditioner one day and not blow through the air vents as they normally did. The air only comes from my thawing, regardless of what the selection to choose between my AC controls. My air conditioning is also an air conditioner dual, in other words, the driver and passengers have their own controls. But again, nothing comes from both sides, just thawed. You also need to know I have already had at least 3 mechanics look at this, but still no answers. Earn the best answer! My car has vacuum lines that I have received little bit information about my trips to the store.

I guess the control vent door is not moving. I do not remember if the car has a vacuum or electrical controls for door assy. I think the vacuum. check the vacuum lines for leakage, the main line coming from the engine and distribution lines the engines of the gate. Good luck.

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