AUTOMATIC TEMPERATURE CONTROL MODULE
Many of the features and operations of the heating and ventilation system are controlled by the Automatic Temperature Control (ATC) module, which is located on the end of the air inlet duct casing. Refer to Control Components information.
AIR INLET DUCT
| Item Number | Description |
|---|---|
| 1 | ATC module |
| 2 | Fresh/recirculated air door |
| 3 | Fresh/recirculated air door motor |
| 4 | Blower motor control module |
| 5 | Blower motor and fan assembly |
The air inlet duct is installed behind the instrument panel on the passenger side. Inlet air passes through the cabin filter and into the air inlet duct where it enters the blower. A servo motor mounted on the air inlet duct allows fresh or recirculated air to be selected. Operation of the fresh/recirculated door is controlled by the ATC module.
BLOWER
The blower is contained within the air inlet duct assembly and consists of an open hub, centrifugal fan powered by an electric motor. Operation of the blower is controlled by the ATC module using a relay located in the auxiliary junction box and the blower motor control module. The blower motor control module is installed in the air inlet duct downstream of the blower, where any heat generated during operation is dissipated by the air flow.
HEATER COOLANT PUMP
A heater coolant pump is mounted on the RH rear face of the radiator housing. The pump is electrically driven and provides the necessary flow rate of engine coolant to the heater core. Operation of the pump is controlled by the Central Junction Box (CJB) on receipt of medium speed Controller Area Network (CAN) bus signals from the ATC module.
The pump will run when the engine is running and operates at a single speed. The CJB broadcasts pump status over the medium speed CAN bus for use by other vehicle systems.
Note. The pump can be forced to run when the engine is not running if required. Refer to ENGINE COOLING (V8 5.0L PETROL/V8 S/C 5.0L PETROL) or SUPERCHARGER COOLING (V8 S/C 5.0L PETROL) information.
VENTILATION OUTLETS
The ventilation outlets allow the free flow of air through the passenger compartment. The outlets are installed in the LH and RH rear quarter panels, below the tail lamps.
Each ventilation outlet consists of a grille covered by a soft rubber flap, and is effectively a non-return valve. The flaps open and close automatically depending on the differential between cabin and outside air pressures.