This unit mounts on the main air chamber, it opens and closes the air vent. Made of nylon with a steel and brass plunger just like original. This unit is easy to test and can be seen by removing the glove box. Often it is the internal spring that fails on these and if your Cougar or Mustang will not easily change between blowing through the defrost ducts and the floor duct, this unit may be the culprit. Switch assembly, servo control.
Replaces Ford part # C6OZ-18C311-A.
*NOTE* You will need to retain your mounting bracket from your old unit.