theair in my 93 chrysler lebaron only blows out the defrost vent and not the others what might be wrong?

the air blend doors are operated by a vacuum supplied by the engine, somewhere between the vacuum source on the engine and the firewall where a hose goes into the car passenger area, there will be a plastic reservoir that holds reserve vacuum, you more than likely have a leak in the system have fun, use some common sense and logic and you'll locate it, in a quiet area with the motor idling safely in park with wheels blocked you might be able to hear it hissing, don't get fooled the hiss may sound like one area and the leak across the car, get a car repair manual from a parts store for locating it there is only about 30 feet of vacuum hose on the average a/c system learn to love it the engines are too hot to work on in summer stick with h/vac