My parents gave us my mom's Buick Park Avenue. It's in really nice shape and mechanically sound. However, the A/C blows at the floor and at the windshield as if it is trying to defrost. I pressed all the button of the control board but nothing makes it change to blowing air out the normal A/C vents. I know that are things like vacuum lines under there and such and solenoids that move the flaps that channel the air.
How can I fix this where it blows the A/C our the normal forward facing vents/channels instead of it blowing out the locations for winter heat?
1988 Buick Park Avenue with all the bells and whistles. V6 engine and front-wheel drive