Heating and Ventilation Land Rover Range Rover Sport L320

Note. right-hand drive (RHD) installation shown, left-hand drive (LHD) similar

GENERAL

The heating and ventilation system controls the temperature and flow of air supplied to the vehicle interior. The system consists of

1. An air inlet duct.
2. A blower.
3. A blower control module.
4. A blower relay.
5. A heater.
6. Two ventilation outlets.

Fresh or recirculated air flows into the heater assembly from the inlet duct. The blower, and ram effect when the vehicle is moving, forces the air through the heater assembly. Air from the cabin exhausts through the ventilation outlets.

AIR INLET DUCT

Note. right-hand drive (RHD) version shown, left-hand drive (LHD) mirror image

The air inlet duct is installed behind the instrument panel, on the front passenger side, and connected between the plenum chamber below the windshield and the heater.

The plenum chamber is formed by the upper and lower cowl and a plenum molding. Grilles in the plenum molding allow fresh air into the plenum chamber. From the plenum chamber, the air passes through a water separator and into the fresh air inlet of the air inlet duct.

The air inlet duct incorporates a grille to provide the inlet for recirculated air from the vehicle interior. The air inlet duct also accommodates

1. The cabin air filter. Refer to «Air Distribution and Filtering»(/land-rover/range-rover-sport/l320-2009-2013/remont/automatic-hvac-system/#air-distribution-and-filtering) .
2. The blower.
3. The blower control module.

The outlet from the air inlet duct forms the rear wall of the heater, enclosing the evaporator and incorporating the two evaporator drain outlets. Drain tubes connect the evaporator drain outlets to the transmission tunnel, to direct the water that condenses on the evaporator overboard.

A recirculation door is installed between the fresh and recirculated air inlets, to control the source of incoming air. A lever on the recirculation door is driven by the recirculation door motor. Operation of the recirculation door motor is automatically controlled by the automatic temperature control (ATC) module and manually controlled by a switch on the automatic temperature control (ATC) module control panel. Refer to Control Components .

Fresh or recirculated air enters the air inlet duct and passes through the cabin air filter to the hub of the blower. From the blower, the air flows to the outlet of the air inlet duct and into the heater. The blower, and ram effect from the forward motion of the vehicle, forces the air through the air inlet duct.

BLOWER

The blower is installed in the air inlet duct, below the cabin air filter, and consists of an open hub, centrifugal fan powered by an electric motor. Operation of the blower is controlled by the automatic temperature control (ATC) module, using the blower relay in the battery junction box (BJB) and the blower control module. The blower 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. A wiring harness on the air inlet duct connects the recirculation door motor, blower and blower control module to the vehicle wiring.

When the blower is required, the automatic temperature control (ATC) module energizes the coil of the blower relay. The energized blower relay supplies battery power to the blower motor, which is connected to ground through the blower control module. The speed of the blower is controlled by the blower control module, which regulates the blower motor voltage in response to a pulse width modulation (PWM) signal from the automatic temperature control (ATC) module. To vary the blower motor voltage the automatic temperature control (ATC) module varies the duty cycle of the pulse width modulation (PWM) signal.

When the blower is in the automatic mode the automatic temperature control (ATC) module determines the blower speed required from the comfort algorithms. When the blower is in the manual mode, the automatic temperature control (ATC) module operates the blower at one of seven fixed speeds as selected on the control panel. Refer to Control Components .

HEATER

Note. right-hand drive (RHD) unit shown, left-hand drive (LHD) units similar

The heater controls the temperature of the air supplied to the distribution ducts, as directed by the automatic temperature control (ATC) module. The heater is installed on the vehicle center-line, between the instrument panel and the engine bulkhead. The heater consists of a casing, formed from plastic moldings, which contains an evaporator, heater core and control doors. Internal passages integrated into the casing guide the air through the casing and separate it into two flows, one for the left-hand (LH) outlets and one for the right-hand (RH) outlets.

When the air conditioning (A/C) system is operating, the evaporator cools the air entering the heater.

The heater core provides the heat source to warm the air being supplied to the distribution ducts. The heater core is an aluminum two pass, fin and tube heat exchanger, installed across the width of the heater housing. Two aluminum tubes attached to the heater core extend through the engine bulkhead to connect with the engine cooling system. When the engine is running, coolant is constantly circulated through the heater matrix by the coolant pump. On vehicles with a FFBH (fuel fired booster heater), when the FFBH is active the coolant flow is assisted by an electric circulation pump. Refer to Auxiliary Heater .

Two temperature blend doors, one left-hand (LH) and one right-hand (RH), regulate the flow of air through the heater core to control the temperature of the air leaving the heater. The two temperature blend doors operate independently to allow different temperatures to be set for the left-hand (LH) and right-hand (RH) outlets. Each temperature blend door is driven by a separate stepper motor.

A drive arm is attached to the drive spindle of each temperature blend door stepper motor. The end of the stepper motor drive arm engages with a slot in the drive arm of the related temperature blend door.

Operation of the temperature blend door stepper motors is controlled by the automatic temperature control (ATC) module. Refer to Control Components .

VENTILATION OUTLETS

The ventilation outlets promote the free flow of air through the passenger compartment. The outlets are installed in the left-hand (LH) and right-hand (RH) rear quarter body panels, behind the tail lamps.

Each ventilation outlet consists of a grille covered by soft rubber flaps 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

For a detailed description of the heating and ventilation system and operation, refer to the relevant Description and Operation section of the workshop information. Refer to See HEATING AND VENTILATION .

INSPECTION AND VERIFICATION

Note. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage. VISUAL INSPECTION Mechanical Electrical Front End Accessory Drive (FEAD) belt Intake ducts blocked/restricted Cabin air filter Coolant level Air in cooling system Cooling fan Distribution motors and flaps Fuses Harnesses and connectors Blower relay Blower control module Blower motor assembly Cooling fan Automatic temperature control module Actuators
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

SYMPTOM CHART

DTC INDEX

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Diagnostic Trouble Code (DTC) Index - DTC: Climate Control Module (HVAC) .

Scheme 3

Scheme 4

1. Remove the glove compartment. Refer to «Glove Compartment»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console__glove-compartment) .
2. Remove the passenger side closing trim panel. Release the clip. Remove the 2 screws. Disconnect the electrical connector.
3. Position the footwell duct aside for access. Release the clip.
4. Remove the blower motor. Disconnect the electrical connector. Remove the 3 screws.

INSTALLATION

1. Install the blower motor. Tighten the screws. Connect the electrical connector.
2. Secure the footwell duct. Install the clip.
3. Install the closing trim panel. Connect the electrical connector. Secure the clip. Tighten the screws.
4. Install the glove compartment. Refer to «Glove Compartment»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console__glove-compartment) .

Scheme 5

Scheme 6

1. Drain the cooling system. Refer to «Cooling System Draining, Filling And Bleeding (V8 S/C 5.0L Petrol)»(/land-rover/range-rover-sport/l320-2009-2013/remont/cooling-fan/#engine-cooling) .
2. Remove the instrument panel passenger side reinforcement. Refer to «Instrument Panel Passenger Side Reinforcement»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console) .
3. Remove the heater core upper and lower pipes. Position a container to collect the fluid. Loosen the 4 screws and remove the clips. Remove and discard the 4 O-ring seals.
4. Remove the heater core.

1. Install the heater core.
2. Install the heater core upper and lower pipes. Clean the components. Install the new O-ring seals. Install the clips and tighten the screws. Remove the container.
3. Install the instrument panel passenger side reinforcement. Refer to «Instrument Panel Passenger Side Reinforcement»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console) .
4. Refill the cooling system. Refer to «Cooling System Draining, Filling And Bleeding (V8 S/C 5.0L Petrol)»(/land-rover/range-rover-sport/l320-2009-2013/remont/cooling-fan/#engine-cooling) .

Scheme 7

1. Drain the cooling system. Refer to «Cooling System Draining, Filling And Bleeding (V8 S/C 5.0L Petrol)»(/land-rover/range-rover-sport/l320-2009-2013/remont/cooling-fan/#engine-cooling) .
2. Remove the instrument panel driver side reinforcement. Refer to «Instrument Panel Driver Side Reinforcement»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console) .
3. Remove the driver side footwell duct. Remove the 2 Torx screws.
4. Remove the heater core upper and lower pipes. Position a container to collect the fluid. Loosen the 4 screws and remove the clips. Remove and discard the 4 O-ring seals.
5. Remove the heater core.

1. Install the heater core.
2. Install the heater core upper and lower pipes. Clean the components. Install the new O-ring seals. Install the clips and tighten the screws. Remove the container.
3. Install the driver side footwell duct. Tighten the screws.
4. Install the instrument panel driver side reinforcement. Refer to «Instrument Panel Driver Side Reinforcement»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console) .
5. Refill the cooling system. Refer to «Cooling System Draining, Filling And Bleeding (V8 S/C 5.0L Petrol)»(/land-rover/range-rover-sport/l320-2009-2013/remont/cooling-fan/#engine-cooling) .

See also:
• Air Distribution and Filtering
• Control Components
• Auxiliary Heater
• Diagnostic Trouble Code (DTC) Index - DTC: Climate Control Module (HVAC)
• Glove Compartment
• Cooling System Draining, Filling And Bleeding (V8 S/C 5.0L Petrol)
• Instrument Panel Passenger Side Reinforcement
• HEATING AND VENTILATION