Heating and Ventilation Land Rover Range Rover Sport I

COMPONENT LOCATIONS

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

Scheme 7

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. RHD version shown, LHD mirror image

Scheme 8

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. For additional information, refer to: «Air Distribution And Filtering»(/land-rover/range-rover-sport/i-2005-2009/remont/automatic-hvac-system/#air-distribution-and-filtering) information.
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 ATC module control panel. For additional information, refer to: Control Components information.

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.

Air Flow Through Air Inlet Duct

Scheme 9

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 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 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 ATC module. To vary the blower motor voltage the ATC module varies the duty cycle of the PWM signal.

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

For additional information, refer to: Control Components information.

HEATER

Note. RHD unit shown, LHD units similar

Scheme 10

The heater controls the temperature of the air supplied to the distribution ducts, as directed by the 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 LH outlets and one for the 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.

For additional information, refer to: Auxiliary Heater information.

Two temperature blend doors, one LH and one 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 LH and 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 ATC module.

For additional information, refer to: Control Components information.

Air Flow Through Heater

Scheme 11

VENTILATION OUTLETS

The ventilation outlets promote the free flow of air through the passenger compartment. The outlets are installed in the LH and 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.

OVERVIEW

The heating and ventilation system is a fairly straightforward design requiring no specialized techniques for diagnosis.

Follow the visual inspection below and refer to the diagnostic trouble code (DTC) index for electrical faults.

For information on the description and operation of the system, refer to the relevant service information.

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Visually inspect for obvious mechanical or electrical faults. Visual Inspection Mechanical Electrical Intake ducts blocked/restricted Coolant level Air in cooling system Distribution motors and flaps Fuses Harnesses and connectors Blower relay Blower control module Blower assembly Automatic temperature control module
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. Use the approved diagnostic system or a scan tool to retrieve any DTCs before moving onto the symptom chart or DTC index. Make sure that all DTCs are cleared following rectification.

SYMPTOM CHART

DTC INDEX

Note. Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system). For a full list of climate control DTCs, refer to the DTC index .

Scheme 12

Scheme 13

1. Remove the glove compartment. For additional information, refer to: «Glove Compartment»(/land-rover/range-rover-sport/i-2005-2009/remont/gauges-instrument-panels/#instrument-panel-and-console__glove-compartment) information.
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. For additional information, refer to: «Glove Compartment»(/land-rover/range-rover-sport/i-2005-2009/remont/gauges-instrument-panels/#instrument-panel-and-console__glove-compartment) information.

Scheme 14

1. Drain the cooling system. For additional information, refer to: «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-sc-42l-petrol__cooling-system-draining-filling-and-bleeding) for V8 S/C 4.2L Petrol information. «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-44l-petrol__cooling-system-draining-filling-and-bleeding) for V8 4.4L Petrol information.
2. Remove the instrument panel passenger side reinforcement. For additional information, refer to: «Instrument Panel Passenger Side Reinforcement»(/land-rover/range-rover-sport/i-2005-2009/remont/gauges-instrument-panels/#instrument-panel-and-console) information.
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. For additional information, refer to: «Instrument Panel Passenger Side Reinforcement»(/land-rover/range-rover-sport/i-2005-2009/remont/gauges-instrument-panels/#instrument-panel-and-console) information.
4. Refill the cooling system. For additional information, refer to: «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-sc-42l-petrol__cooling-system-draining-filling-and-bleeding) for V8 S/C 4.2L Petrol information. «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-44l-petrol__cooling-system-draining-filling-and-bleeding) for V8 4.4L Petrol information.

Scheme 15

Scheme 16

Scheme 17

1. Drain the cooling system. For additional information, refer to: «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-sc-42l-petrol__cooling-system-draining-filling-and-bleeding) for V8 S/C 4.2L Petrol information. «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-44l-petrol__cooling-system-draining-filling-and-bleeding) for V8 4.4L Petrol information.
2. Remove the instrument panel driver side reinforcement. For additional information, refer to: «Instrument Panel Driver Side Reinforcement»(/land-rover/range-rover-sport/i-2005-2009/remont/gauges-instrument-panels/#instrument-panel-and-console) information.
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. For additional information, refer to: «Instrument Panel Driver Side Reinforcement»(/land-rover/range-rover-sport/i-2005-2009/remont/gauges-instrument-panels/#instrument-panel-and-console) information.
5. Refill the cooling system. For additional information, refer to: «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-sc-42l-petrol__cooling-system-draining-filling-and-bleeding) for V8 S/C 4.2L Petrol information. «Cooling System Draining, Filling And Bleeding»(/land-rover/range-rover-sport/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-v8-44l-petrol__cooling-system-draining-filling-and-bleeding) for V8 4.4L Petrol information.

See also:
• Air Distribution And Filtering
• Control Components
• Auxiliary Heater
• DTC index
• Glove Compartment
• Cooling System Draining, Filling And Bleeding
• Cooling System Draining, Filling And Bleeding
• Instrument Panel Passenger Side Reinforcement