Frelander 2. Manual — part 409
OVERVIEW
The air distribution and filtering system controls the distribution and quality of air supplied into the front and rear of the
cabin. The system consists of:
Air ducts
Air registers and vents
A cabin air filter.
AIR DUCTS
The air ducts distribute air from the heater assembly to the various registers and vents in the instrument panel and to the
rear of the vehicle.
The face level/side window duct and the windshield duct form part of the instrument panel assembly.
Each front footwell duct is a snap fit into the side of the heater assembly and secured to the cross car beam by a single
screw. The front footwell ducts also provide a location for the footwell lamps.
The rear cabin ducts are also a snap fit into the heater assembly. Each duct runs underneath the carpet and is secured to
the floor of the vehicle by a single screw located beneath the front seat.
AIR REGISTERS AND VENTS
The air registers allow the vehicle occupants to control the flow and direction of air from the air ducts. The instrument
panel contains 4 air registers; 1 mounted on either end of the instrument panel and 2 mounted centrally.
The air vents are fixed outlets. The instrument panel contains 4 air vents; 1 mounted on either end of the instrument
panel and 2 mounted along the top edge, below the windshield.
CABIN AIR FILTER
The cabin air filter is located behind the RH side of the instrument panel and is housed within the heater assembly. The
filter removes odors and fine particles, including pollen, from the air entering the heater assembly.
Climate Control - Heating and Ventilation
Description and Operation
COMPONENT LOCATION
Item
Part Number
Description
1
-
Automatic Temperature Control (ATC) module
2
-
Right Hand (RH) ventilation outlet
3
-
Left Hand (LH) ventilation outlet
4
-
Heater assembly
5
-
Blower motor control module
OVERVIEW
Two levels of heating and ventilation are available. High specification vehicles are fitted with a dual zone automatic
system, which can provide different temperature settings for the LH and RH sides of the cabin. The dual zone system may
also be fitted with a pollution sensor to control the quality of air in the cabin.
Lower specification vehicles are fitted with a single zone manual system.
The heater assembly for both systems is installed on the vehicle center line, between the instrument panel and the engine
bulkhead.
The ATC module controls operation of the blower motor via the blower motor control module, which is mounted on the
bulkhead side of the heater assembly casing.For additional information, refer to: (412-01 Climate Control)
Air Distribution and Filtering
(Description and Operation),
Air Conditioning
(Description and Operation),
Control Components
(Description and Operation).
Some vehicles may also be fitted with an auxiliary heater. For additional information, refer to: (412-02B Auxiliary Climate
Control)
Electric Booster Heater
(Description and Operation),
Fuel Fired Booster Heater
(Description and Operation).
AUTOMATIC TEMPERATURE CONTROL MODULE
Air distribution and temperature is controlled by the Automatic Temperature Control (ATC) module, which is integral with
the control panel. In response to commands from the control panel, the ATC module controls operation of either 3 (single
zone) or 5 (dual zone) stepper motors mounted on the heater assembly casing.
For additional information, refer to:
Control Components
(412-01 Climate Control, Description and Operation).
HEATER ASSEMBLY
Item
Part Number
Description
1
-
Blower motor control module
2
-
Blower motor
3
-
Air Conditioning (A/C) evaporator
4
-
Heater core
5
-
Electric booster heater
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 mounted on the vehicle center line and comprises the following components:
Blower motor
Heater core
Cabin air filter.
For additional information, refer to:
Air Distribution and Filtering
(412-01 Climate Control, Description and
Operation).
A/C evaporator.
For additional information, refer to:
Air Conditioning
(412-01 Climate Control, Description and Operation).
Air intake flap and stepper motor.
For additional information, refer to:
Control Components
(412-01 Climate Control, Description and Operation).
Air distribution flaps and stepper motors.
For additional information, refer to:
Control Components
(412-01 Climate Control, Description and Operation).
Temperature blend flaps and stepper motors.
For additional information, refer to:
Control Components
(412-01 Climate Control, Description and Operation).
Electric booster heater (if fitted).
For additional information, refer to: Electric Booster Heater (412-02 Auxiliary Climate Control, Description and
Operation).
Blower Motor
The blower motor comprises an open hub, centrifugal fan powered by an electric motor. Operation of the blower motor is
controlled by the ATC module in conjunction with the blower motor control module. The ATC module provides a Pulse Width
Modulated (PWM) signal to the blower motor control module based on the required blower speed. The blower motor control
module interprets the PW M signal as a blower motor speed and controls the voltage to the blower motor accordingly.
For additional information, refer to:
Control Components
(412-01 Climate Control, Description and Operation).
Heater Core
The heater core provides the heat source to warm the air being supplied into the cabin. The heater core is an aluminum, 2
pass, fin and tube heat exchanger installed across the width of the heater assembly. Two aluminum tubes attached to the
heater core extend through the engine bulkhead and connect to the engine cooling system. W hen the engine is running,
engine coolant is constantly circulated through the heater core by the coolant pump. For additional information, refer to:
Engine Cooling
(303-03A Engine Cooling - I6 3.2L Petrol, Description and Operation),
Engine Cooling
(303-03B Engine Cooling - TD4 2.2L Diesel, Description and Operation).
VENTILATION OUTLETS
The ventilation outlets allow the free flow of air through the cabin. The outlets are installed in the LH and RH rear quarter
panels, behind the tail lamps.
Each ventilation outlet comprises 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.
PRINCIPLES OF OPERATION
Operation of the heating and ventilation system is controlled by the ATC module.
For additional information, refer to:
Control Components
(412-01 Climate Control, Description and Operation).
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