my first time posting on the site but it seems very helpfull. i've have a 2000 durango 5.9l last winter blower would only blow out of the vent no defrost or floor. now the ac pump cycles on and off just like normal and lines are getting cold. checked it with gauges and every things fine on that end. is it something in the dash that's stoping the air from being diverted. thanks for any help