Civic EX Sedan L4-1668cc 1.7L SOHC (VTEC) MFI (2001)
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Air Door Actuator / Motor: Description and Operation
How the Circuit Works
The heater control unit-panel controls the blower controls, air delivery, and A/C compressor controls automatically. With the ignition switch in ON (II),
battery voltage is supplied through fuse 14. The control unit is grounded at G502.
Air Delivery
The heater control unit-panel controls the blower motor and supplies a 5 VDC reference voltage to the air mixture control motor.
The air mix and mode control motors each receive inputs from the 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. Use the mode control dial to select
the vents the air flows from. Some air will flow from the dashboard corner vents in all modes. Both the air mix control motor and mode control motor are
grounded by the control unit.
The recirculation control motor receives battery voltage through fuse 14 when the ignition switch is ON (II). It regulates the position of the fresh/recirc
door, and is controlled by the heater control unit-panel when the recirculation button is pressed at the recir-A/C-rear defogger switch assembly.
