My passenger side vent door will not close. The heater control cable can open the door, but it can not close it. The previous owner obviously had this problem and broke the cable where it attaches to the heater control panel.
There is a spring on the passenger vent door that looks like it was designed to help close the vent. Is it possible that after 16 years the spring is worn out? Has anyone tried replacing the spring to improve vent door closing performance?