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.
Scheme 40
| Item Number | Description |
|---|---|
| 1 | A/C evaporator |
| 2 | Heater coolant pipes |
| 3 | Windshield distribution door motor |
| 4 | RH temperature blend motor |
| 5 | Heater core |
| 6 | LH temperature blend motor |
| 7 | Face and feet distribution door motor |
The heater assembly controls the temperature of the air supplied to the air distribution ducts, as directed by the ATC module. The heater assembly is installed on the vehicle center line, between the instrument panel and the engine bulkhead.
The heater assembly consists of a casing which contains the Air Conditioning (A/C) evaporator, the heater core, 2 air distribution control doors, and 2 temperature blend control doors.
The A/C evaporator is controlled as part of the A/C system. Refer to Air Conditioning article.
The heater core provides the heat source to warm the air being supplied to the cabin. The heater core is an aluminum 2 pass, fin and tube heat exchanger, and is installed across the width of the heater housing. Two aluminum tubes attached to the heater core extend through the engine bulkhead and connect to the engine cooling system. When the engine is running, coolant is constantly circulated through the heater core by the coolant pump. Refer to Engine Cooling article.
Scheme 41
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 article.
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.