Air Distribution and Filtering
AIR DISTRIBUTION AND FILTERINGA/C Air Distribution Components:
Distribution, Air Components - Front
Auxiliary A/C Air Distribution Components:
Distribution, Air Components - Rear
Internal Components of the Air Distribution System
System Description
The purpose of the air distribution system is to route air to the designated registers. This is accomplished when air enters the plenum through the fresh/recirculated air inlet and is routed to the desired outlets by the use of distribution doors.
The air distribution system contains the heater core, A/C evaporator core, A/C blower motor and all of the distribution doors. Incoming air is mixed and distributed inside of the plenum assembly, depending on the distribution door positions.
HEATING AND DEFROSTING
The heater system is a blended air system, receiving outside air through the air inlet, which is connected to the upper cowl. Air is directed through and/or around the heater core and mixed and discharged through outlets in the plenum assembly to the floor, panel or defrost nozzles, as desired.
CONTROL COMPONENTS
The manual climate control components are used to:
^ Select air inlet source (fresh/recirculated).
^ Select blower motor speed.
^ Select discharge air temperature (temperature blend).
^ Select discharge air location (defrost, panel, floor).
^ Select compressor clutch operation.
Control System Inputs
The climate control system inputs are selected manually from the climate control head.
Control System Outputs
The air management doors are controlled by vacuum control motors and an A/C electronic door actuator motor. The air inlet and distribution doors are controlled by a vacuum control motors. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. The temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.