Wax Pellet Controlled (Except 2.8L & 3.1L)

A self-contained, wax pellet actuated assembly mounted in the air cleaner controls the air regulator damper (hot/cold air delivery door). When incoming air is cold, wax material sealed in the actuator is in a solid contracted state. As incoming air warms, wax material expands by changing to a liquid state. This forces piston outward, repositioning air regulator damper and allowing air (either a mix of hot and cold or all cold) to enter engine.