RL V6-3474cc 3.5L (1998)
Control Module HVAC: Description and Operation
Control Module
The climate control unit receives battery voltage at all times through fuse 56. With the ignition switch in ON (II), voltage is supplied to the climate
control unit. The control unit is grounded at G402.
The climate control unit controls the recirculation control motor, air mix motor, and mode control motor. It also supplies a 5 VDC reference voltage to
the air mixture control motor and the mode control motor.
The air mixture and mode control motors each receive inputs from the climate control unit. The air mix motor regulates the mixture of cold and hot air
by varying the position of the heater-evaporator door.
The mode control motor controls the direction and volume of outlet air. The air flow can be directed to the dashboard vents or the corner vents.
Both the air mixture control motor and mode control motor are grounded by the climate control unit.
The recirculation control motor receives battery voltage through fuse 3 when the ignition switch is in ON (II). It regulates the position of the fresh/recirc
door, and is controlled by two position inputs from the climate control unit ("Recirc" and "Fresh").
