Roadmaster Estate Wagon V8-305 5.0L (1991)
Thermostatic Air Cleaner: Description and Operation
Air Cleaner
Thermac Operation
SYSTEM DESCRIPTION
The THERMAC system regulates incoming air temperature without the use of vacuum. The air regulating damper is controlled by means of a self
contained, actuated wax pellet assembly, attached to the air cleaner housing. When the air entering is cold, the wax material, which is sealed in the
actuator, causes the damper door to close off the outside air inlet. This allows all entering air to be heated by the exhaust manifold. As the air warms, the
wax material expands by changing to a liquid state. The piston repositions the damper door allowing intake air (hot and cold) to combine.