C 1500 Truck 2WD V8-350 5.7L VIN K TBI (1995)
Thermostatic Air Cleaner: Description and Operation
Air Cleaner With Heated Air Intake System
Thermac Operation
PURPOSE:
A heated intake air system is used for good driveability under varying climatic conditions. Having a uniform inlet air temperature improves fuel
vaporization.
OPERATION:
The heated intake air system regulates incoming air temperature without the use of vacuum. The air regulating damper is controlled by means of a
self contained, wax pellet actuated assembly mounted in the air cleaner. When incoming air is cold, the wax material sealed in the actuator is in a
solid phase and the damper closes off the cold air inlet. This causes all incoming air to be heated by the exhaust manifold. As the incoming air
warms, the wax material expands changing to a liquid phase which forces out a piston to reposition the damper allowing a cold and hot air mix or
all cold air to enter the engine.
