GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Controls - 6.0L and 7.0L 🢒 Air Intake System Description

Purpose

A heated air intake system gives good driveability under varying climatic conditions. Having a uniform inlet air temperature improves the fuel vaporization.

Operation
Object Number: 314381 Size: SH

The air intake system regulates the incoming air (snorkel 1) temperature without the use of a vacuum. A self-contained, wax-pellet actuated assembly (2) mounted in the air cleaner controls the air regulating damper. When the incoming air is cold, the wax material sealed in the actuator is in a solid (contracted) phase. This causes the damper (3) to close off the cold air inlet and open the hot air inlet.


Object Number: 314384 Size: SH
(1)Snorkel
(2)Wax Pellet Actuator
(3)Piston
(4)Calibrated Spring
(5)Hot Air Inlet
(6)Regulating Damper Assembly
(7)Cold Air Inlet

All incoming air is then drawn through the heat stove tube from the heat stove mounted on the exhaust manifold. As the incoming air warms, the wax material expands. This forces a piston out in order to reposition the damper allowing a cold and hot air mixture or cold air to enter the engine.