HVAC Temperature Controls Circuit Description

The driver controls the temperature by engaging or disengaging the A/C compressor and directing system air through or around the heater core.

In the dual zone system, the air mix door is split in half. Each half has its own actuator.

When the system is operating in dual zone mode, the heater and A/C programmer operates each actuator separately. The driver side discharge temperature depends on the following conditions:
^ The coolant temperature
^ The ambient air temperature
^ The inside air temperature
^ The left sun load sensor
^ The heater and A/C control temperature setting

The passenger side discharge air temperature depends on the following conditions:
^ The coolant temperature
^ The ambient air temperature
^ The inside air temperature
^ The right sun load sensor
^ The passenger climate control setting

When the system is not operating in dual zone mode, the actuators are operating in unison, as the system works in order to maintain the heater and A/C control temperature setting.