Rear Climate Controls

WARNING: This page is about a different car, the 2022 Lincoln Aviator. However, it is still accessible from the selected car via links, so may be relevant.

For diagnosis and testing of the rear climate control system, Refer to: Climate Control System .

The rear climate control system operation is determined by the settings on the front HVAC control panel selection or from the RHVAC control panel selection. The rear climate control components are hard wired to the HVAC control module. Air is cooled and dehumidified by the rear A/C evaporator core only if the front (main) climate control system is operating in a mode that requires A/C compressor operation.

For rear climate control access information through Sync™ 3 or the front HVAC control module refer to Owners Literature.

Rear Climate Controls - Front DATC

The customer interface from the front (main) DATC panel for the rear climate system consists of the following selections:

Rear passenger temperature control
Rear climate control lock
Rear passenger power
Rear fan speed control

For illustrations and rear climate control button operation information, refer to the Owner's Literature.

Rear Climate Controls - Front Touchscreen

The customer interface from the touchscreen has access to the rear climate control system. In the lower right of the main touchscreen, touch Climate. On the climate screen, touch Rear from the lower right corner. Rear climate control settings appear at the bottom of the screen:

Touch the power icon to turn the rear climate control functions off and on.
Touch Rear Control to allow the rear seat passengers to adjust the rear climate settings. Touch it again to prevent the rear seat passengers from adjusting the settings. Rear Control automatically turns off when you use the touchscreen to adjust the rear climate settings.
Touch + or - to adjust the temperature.
To adjust fan speed, touch + or - next to the fan icon.
Touch Rear again to close the rear controls. Closing the rear climate control functions does not affect their current settings.

For illustrations and rear climate control button operation information, refer to the Owner's Literature.

Control System Logic

When a selection has been made on the rear climate control panel, known as the RHVAC control module, a message is sent to the HVAC control module over the MS-CAN.

Air Handling

The rear climate control system has the following features:

The driver has primary control of the rear climate control system or can transfer control to the rear passenger control panel.
The rear blower motor recirculates the air inside the vehicle. Outside air is not available to the rear system.
The rear temperature door and the rear air distribution door are controlled by electric actuator motors.
Movement of the rear temperature control between cool and warm causes a corresponding movement of the rear temperature door to mix air flowing through and around the rear heater core.
Movement of the rear mode control between PANEL and FLOOR causes a corresponding movement of the rear air distribution door to direct airflow between the panel (upper side trim panel) registers and the floor duct.
Airflow is directed to the passengers through adjustable registers. The heater floor duct supplies air to a fixed register, which is integral to the side trim panel.

The HVAC control module sends a PWM signal to the rear blower motor speed control to control the blower speed. The rear blower motor speed control provides variable ground feed for the blower motor. A delay function provides a gradual increase or decrease in blower motor speed under all conditions.