Malibu V6-191 3.1L VIN M SFI (1997)
Control Assembly: Description and Operation
Recirculation/Fresh Air Control
The recirculation feature is driven by a switch on the control assembly. The switch controls a solenoid which directs vacuum to the vacuum actuator that
moves the air inlet valve.
Temperature Control
Temperature is controlled according to the position of the temperature knob on the control assembly. An electric motor controls the temperature valve
based on input from the temperature knob. The valve controls air flow through the heater core as the temperature knob is moved through its full travel.
The position of the temperature valve is independent of mode selection. The temperature motor attaches to the right side of the HVAC module.
Mode Control
The mode of operation of the control assembly is determined by the position of the mode knob. The mode knob controls a vacuum switch that supplies
engine vacuum to the appropriate vacuum actuator(s) for the mode selected. Vacuum hoses are molded to a connector that is attached to the vacuum
switch.
Blower Speed Control
The blower speed is controlled by a knob which actuates an electrical switch. The blower circuit is open in the OFF position. In all modes, the blower
has 5 speeds to control the amount of air that flows through the HVAC module.
