You have what's called actuators in your hvac. One controls hot/cold and theother controls where it goes. Your one actuator is eitehr stuck or not working. If it's vacuum operated check for a leak, if it's electrically operated then check to see if it's getting electric when you put it on a/c. My guess it's vacuum and isn't getting vacuum to operate correctly
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Monday, August 8th, 2011 AT 11:09 PM