Air Conditioning Land Rover Range Rover L322

SPECIFICATIONS

LUBRICANT

REFRIGERANT

TORQUE SPECIFICATIONS

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OVERVIEW

The A/C system transfers heat from the vehicle interior to the outside atmosphere to provide the heater assembly with dehumidified cool air. The system is a sealed, closed loop, filled with a charge weight of R134a refrigerant as the heat transfer medium. Oil is added to the refrigerant to lubricate the internal components of the A/C compressor.

To accomplish the transfer of heat, the refrigerant is circulated around the system, where it passes through 2 pressure/temperature regimes. In each of the pressure/temperature regimes, the refrigerant changes state, during which process maximum heat absorption or release occurs. The low pressure/temperature regime is from the thermostatic expansion valve, through the evaporator to the A/C compressor; the refrigerant decreases in pressure and temperature at the thermostatic expansion valve, then changes state from liquid to vapor in the evaporator, to absorb heat. The high pressure/temperature regime is from the A/C compressor, through the condenser and receiver drier to the thermostatic expansion valve; the refrigerant increases in pressure and temperature as it passes through the A/C compressor, then releases heat and changes state from vapor to liquid in the condenser.

Some vehicles may be fitted with a 4 zone climate control system. Refer to Auxiliary Climate Control .

A/C COMPRESSOR

The A/C compressor circulates refrigerant around the system by compressing low pressure, low temperature vapor from the evaporator and discharging the resultant high pressure, high temperature vapor to the condenser. Although similar in appearance, the A/C compressor installed on TdV8 vehicles differs slightly to the one installed on 5.0L vehicles.

Scheme 18

The A/C compressor fitted to 3.6L TdV8 diesel vehicles is a variable displacement unit. The secondary accessory drive belt, driven by the engine crankshaft, drives the A/C compressor via a pulley.

The A/C compressor is a 7 cylinder swash plate unit with a minimum displacement of 5.5 cm 3 /rev (0.34 in 3 /rev) and maximum displacement of 171 cm 3 /rev (10.4 in 3 /rev). A control valve in the A/C compressor automatically adjusts the displacement (i.e. flow of refrigerant), between the minimum and maximum values, to match the thermal load of the evaporator. By matching the refrigerant flow to the thermal load of the evaporator, the variable A/C compressor maintains a relatively constant evaporator temperature of approximately 3 to 4 o C (37 to 39 o F).

To protect the refrigerant system from unacceptably high pressure, a pressure relief valve is installed in the outlet side of the A/C compressor. The pressure relief valve is set to open at 3.5 to 4.1 MPa (508 to 595 lbf/in 2 ) and vents excess pressure into the engine compartment. The pressure relief valve closes again when the pressure decreases to 3.01 MPa (437 lbf/in 2 ).

The pulley of the A/C compressor incorporates a mechanical torque limiter, which disconnects the drive plate from the compressor shaft if torque increases to a level that indicates imminent compressor seizure.

The A/C compressor fitted to 5.0 V8 petrol vehicles is a variable displacement unit. The secondary accessory drive belt, driven by the engine crankshaft, drives the A/C compressor via a pulley. Operation of the compressor is controlled by an electronic control valve working in conjunction with the ATC (automatic temperature control) module.

The A/C compressor is a 7 cylinder swash plate unit with a minimum displacement of 1.6 cm 3 /rev (0.10 in 3 /rev) and maximum displacement of 163 cm 3 /rev (9.95 in 3 /rev). The ATC automatically adjusts the displacement of the A/C compressor between the minimum and maximum values, to match the thermal load of the evaporator. By matching refrigerant flow and the thermal load of the evaporator, the ATC maintains cabin comfort while also considering fuel economy.

To protect the refrigerant system from unacceptably high pressure, a pressure relief valve is installed in the outlet side of the A/C compressor. The pressure relief valve is set to open at 3.5 to 4.1 MPa (508 to 595 lbf/in 2 ) and vents excess pressure into the engine compartment. The pressure relief valve closes again when the pressure decreases to 3.1 MPa (449 lbf/in 2 ).

The pulley of the A/C compressor incorporates a mechanical torque limiter, which disconnects the drive plate from the compressor shaft if torque increases to a level that indicates imminent compressor seizure.

CONDENSER AND RECEIVER DRIER

Scheme 19

The condenser transfers heat from the refrigerant to the surrounding air to convert the vapor from the A/C compressor into a liquid. A receiver drier module, integrated onto the LH side of the condenser, incorporates a filter and a desiccant to remove solid impurities and moisture from the refrigerant. The receiver drier module also functions as a reservoir for liquid refrigerant, to accommodate changes of heat load at the evaporator.

The condenser is installed immediately in front of the radiator.

The condenser is classified as a multiflow condenser and consists of a fin and tube heat exchanger installed between two end tanks.

3.6L TdV8

Divisions in the end tanks separate the heat exchanger into a four pass upper (condenser) section and a two pass lower (sub-cooler) section. A connector block on the left end tank of the condenser provides connections for the high pressure lines from the A/C (air conditioning) compressor and the evaporator. Two pipes at the bottom of the right end tank of the condenser provide connections for the receiver drier.

5.0L V8

Divisions in the end tanks separate the heat exchanger into a three pass upper (condenser) section and a single pass lower (sub-cooler) section, which are interconnected by the receiver drier module. The desiccant cluster and the filter in the receiver drier module are serviceable items retained in position by a threaded plug.

THERMOSTATIC EXPANSION VALVE

The thermostatic expansion valve meters the flow of refrigerant into the evaporator, to match the refrigerant flow with the heat load of the air passing through the evaporator matrix.

The temperature and pressure of the refrigerant leaving the evaporator act on the thermostatic expansion valve to control the volume of refrigerant flowing through the evaporator. The warmer the air flowing through the evaporator matrix, the more heat available to evaporate refrigerant and thus the greater the volume of refrigerant allowed through the metering valve.

Scheme 20

The evaporator is installed in the heater assembly between the blower and the heater matrix, to absorb heat from the exterior or recirculated air. Low pressure, low temperature refrigerant changes from liquid to vapor in the evaporator, absorbing large quantities of heat as it changes state.

Most of the moisture in the air passing through the evaporator condenses into water, which drains through the floorpan to the underside of the vehicle through two drain tubes.

REFRIGERANT LINES

To maintain similar flow velocities around the system, the diameter of the refrigerant lines varies to suit the two pressure/temperature regimes. The larger diameters are installed in the low pressure/temperature regime and the smaller diameters are installed in the high pressure/temperature regime.

Low and high pressure charging connections are incorporated into the refrigerant lines near the front RH corner of the engine compartment.

CONTROL DIAGRAM

Note. NOTE: A = Refrigerant liquid; B = Refrigerant vapor

For additional information. Refer to Climate Control System .

REMOVAL

Note. Some variation in the illustrations may occur, but the essential information is always correct.

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1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. Refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/land-rover/range-rover/l322-2009-2012/remont/ac-compressor/#climate-control-system-general-information) .
3. Raise and support the vehicle.
4. Torque: 140 Nm CAUTION: LH illustration shown, RH is similar.
5. Refer to «Steering Gear - 5.0L SC V8 - AJ133, LHD AWD»(/land-rover/range-rover/l322-2009-2012/remont/manual-power-steering/#power-steering__steering-gear-50l-lhd-vehicles-with) .
6. Torque: 18 Nm CAUTION: Make sure that all openings are sealed. Use new blanking caps. CAUTION: A new O-ring seal is to be installed.
7. Torque: 25 Nm
8. Torques: M8 nut: 9 Nm M8: 25 Nm
9. Torques: M8 nut: 9 Nm M8: 9 Nm
10. Torque: 25 Nm

INSTALLATION

1. To install, reverse the removal procedure.

Note. Some variation in the illustrations may occur, but the essential information is always correct.

1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. Refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/land-rover/range-rover/l322-2009-2012/remont/ac-compressor/#climate-control-system-general-information) .
3. Raise and support the vehicle.
4. Torque: 140 Nm CAUTION: LH illustration shown, RH is similar.
5. Refer to «Steering Gear - 5.0L NA V8 - AJ133, LHD AWD»(/land-rover/range-rover/l322-2009-2012/remont/manual-power-steering/#power-steering__steering-gear-50l-lhd-vehicles-without) .
6. Torque: 18 Nm CAUTION: Make sure that all openings are sealed. Use new blanking caps. CAUTION: A new O-ring seal is to be installed.
7. Torque: 25 Nm
8. See figure CAUTION: Make sure that all openings are sealed. Use new blanking caps. CAUTION: A new O-ring seal is to be installed. Torques: M8 nut: 9 Nm M8: 25 Nm
9. Torques: M8 nut: 9 Nm M8: 9 Nm
10. Torque: 25 Nm

1. To install, reverse the removal procedure.

Note. Removal steps in this procedure may contain installation details.

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1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. Raise and support the vehicle.
3. Refer to «SUPERCHARGER COOLING SYSTEM DRAINING, FILLING AND BLEEDING - GENERAL PROCEDURES»(/land-rover/range-rover/l322-2009-2012/remont/cooling-fan/#supercharger-cooling)
4. Refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/land-rover/range-rover/l322-2009-2012/remont/ac-compressor/#climate-control-system-general-information) .
5. Refer to «Hood Latch Panel»(/land-rover/range-rover/l322-2009-2012/remont/exterior-body-panels/#front-end-body-panels) .
6. Refer to «Air Cleaner RH»(/land-rover/range-rover/l322-2009-2012/remont/mechanical/#intake-air-distribution-and-filtering-v8-sc-50l-gasoline) .
7. Refer to «Air Cleaner Outlet Pipe RH»(/land-rover/range-rover/l322-2009-2012/remont/mechanical/#intake-air-distribution-and-filtering-v8-sc-50l-gasoline) .
8. Torque: 9 Nm
9. Torque: 8 Nm
10. Torque: 8 Nm
11. See figure CAUTION: Always protect the cooling pack elements to prevent accidental damage.

1. To install reverse the removal procedure.

Note. Removal steps in this procedure may contain installation details.

Scheme 37

1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. Raise and support the vehicle.
3. Refer to «SUPERCHARGER COOLING SYSTEM DRAINING, FILLING AND BLEEDING - GENERAL PROCEDURES»(/land-rover/range-rover/l322-2009-2012/remont/cooling-fan/#supercharger-cooling)
4. Refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/land-rover/range-rover/l322-2009-2012/remont/ac-compressor/#climate-control-system-general-information) .
5. Refer to «Hood Latch Panel»(/land-rover/range-rover/l322-2009-2012/remont/exterior-body-panels/#front-end-body-panels) .
6. Refer to «Air Cleaner RH»(/land-rover/range-rover/l322-2009-2012/remont/mechanical/#intake-air-distribution-and-filtering-v8-sc-50l-gasoline) .
7. Refer to «Air Cleaner Outlet Pipe RH»(/land-rover/range-rover/l322-2009-2012/remont/mechanical/#intake-air-distribution-and-filtering-v8-sc-50l-gasoline) .
8. Torque: 9 Nm NOTE: Some variation in the illustrations may occur, but the essential information is always correct.
9. Torque: 8 Nm
10. Torque: 8 Nm
11. See figure CAUTION: Always protect the cooling pack elements to prevent accidental damage.

1. To install reverse the removal procedure.

Note. Removal steps in this procedure may contain installation details.

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1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. Raise and support the vehicle.
3. Refer to «Hood Latch Panel»(/land-rover/range-rover/l322-2009-2012/remont/exterior-body-panels/#front-end-body-panels) .

1. To install reverse the removal procedure.

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1. Set the footwell duct air outlet to closed.
2. Make the air bag supplemental restraint system (SRS) safe. Refer to «Standard Workshop Practices»(/land-rover/range-rover/l322-2009-2012/remont/dtc-index/#dtc-index-general-information) .
3. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
4. Remove the heater and evaporator core housing. Refer to «HEATING AND VENTILATION»(/land-rover/range-rover/l322-2009-2012/remont/automatic-hvac-system/#heating-and-ventilation) .
5. Reposition the heater and evaporator core housing for access.
6. See figure Remove the left-hand footwell duct. Remove the 2 screws.
7. See figure Remove the thermostatic expansion valve cover. Release the wiring harness from the 2 tangs. Remove the 4 screws.
8. See figure Remove the right-hand footwell duct. Remove the 4 screws. Remove the clip.
9. Disconnect the footwell duct actuator electrical connector.
10. Release the evaporator temperature sensor from the heater and evaporator core housing.
11. See figure Remove the heater and evaporator core housing lower cover. Remove the 7 screws. Remove the 4 clips.
12. See figure CAUTION: Make sure that all openings are sealed. Use new blanking caps. Remove the thermostatic expansion valve. Remove the 2 bolts. Remove the 2 air conditioning (A/C) pipe clamps. Release the A/C pipes. Remove and discard the O-rings.
13. Remove the evaporator core.

1. Install the evaporator core.
2. Install the thermostatic expansion valve. Clean the component mating faces. Lubricate and install the new O-rings. Install the A/C pipes. Install the 2 A/C pipe clamps. Tighten the screws to 6 Nm (4 lb.ft).
3. Install the heater and evaporator core housing lower cover. Install the screws. Install the clips.
4. Install the evaporator temperature sensor to the heater and evaporator core housing.
5. Connect the footwell duct actuator electrical connector.
6. Install the right-hand footwell duct. Install the screws. Install the clip.
7. Install the thermostatic expansion valve cover. Install the screws. Secure the wiring harness to the tangs.
8. Install the left-hand footwell duct. Install the screws.
9. Reposition the heater and evaporator core housing for access.
10. Install the heater and evaporator core housing. Refer to «HEATING AND VENTILATION»(/land-rover/range-rover/l322-2009-2012/remont/automatic-hvac-system/#heating-and-ventilation) .
11. Connect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .

Note. Removal steps in this procedure may contain installation details.

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1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. See «Condenser Core - 5.0L NA V8 - AJ133»(/land-rover/range-rover/l322-2009-2012/remont/automatic-hvac-system/#air-conditioning) .
3. See figure NOTE: Make sure that all openings are sealed. Use new blanking caps.

1. To install, reverse the removal procedure.

Note. Removal steps in this procedure may contain installation details.

1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. See «Condenser Core - 5.0L SC V8 - AJ133»(/land-rover/range-rover/l322-2009-2012/remont/automatic-hvac-system/#air-conditioning) .
3. See figure NOTE: Make sure that all openings are sealed. Use new blanking caps.

1. To install, reverse the removal procedure.

ALL VEHICLES

1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .
2. Remove the plenum chamber. Refer to «Plenum Chamber»(/land-rover/range-rover/l322-2009-2012/remont/automatic-hvac-system/#air-distribution-and-filtering) .
3. Recover the air conditioning (A/C) refrigerant. Refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/land-rover/range-rover/l322-2009-2012/remont/ac-compressor/#climate-control-system-general-information) .

ALL VEHICLES

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1. See figure CAUTION: Make sure that all openings are sealed. Use new blanking caps. Disconnect the A/C pipes. Remove the 2 bolts. Remove and discard the 2 O-ring seals.
2. See figure NOTE: LH illustration shown, RH is similar. Remove the floor console extension trim panel. Remove the screw. Release the 2 clips.

RIGHT-HAND DRIVE VEHICLES

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1. See figure Release the driver side closing trim panel. Remove the 4 screws. Remove the clip.
2. See figure Remove the driver side closing trim panel. Disconnect the 2 electrical connectors. Release the vehicle diagnostic socket.
3. Remove the right-hand front footwell duct. Remove the 2 screws.

LEFT-HAND DRIVE VEHICLES

Scheme 51

1. See figure Remove the passenger side closing trim panel. Remove the 3 screws. Remove the electrical connector.
2. See figure Remove the passenger side footwell duct. Remove the screw.

ALL VEHICLES

Scheme 52

1. See figure Remove the thermostatic expansion valve cover. Release the wiring harness from the 2 tangs. Remove the 4 screws.
2. See figure CAUTION: Make sure that all openings are sealed. Use new blanking caps. Remove the thermostatic expansion valve. Remove the 2 bolts. Remove the 2 A/C pipe clamps. Remove the A/C pipes. Remove and discard the O-rings.

ALL VEHICLES

1. Install the thermostatic expansion valve. Remove the blanking caps from the ports. Clean the component mating faces. Lubricate and install the new O-rings. Install the A/C pipes. Install the 2 A/C pipe clamps. Tighten the bolts to 6 Nm (4 lb.ft).
2. Install the thermostatic expansion valve cover. Install the 4 screws. Secure the wiring harness to the tangs.

RIGHT-HAND DRIVE VEHICLES

1. Install the right-hand front footwell duct. Install the screws.
2. Install the driver side closing trim panel. Connect the electrical connectors. Attach the vehicle diagnostic socket.
3. Secure the driver side closing trim panel. Install the screws. Install the clip.

LEFT-HAND DRIVE VEHICLES

1. Install the passenger side closing trim panel. Connect the electrical connector. Install the screws.
2. Install the passenger side footwell duct. Install the screw.
3. Install the floor console extension trim panel. Secure the clips. Install the screw.
4. Connect the A/C pipes. Remove the blanking caps from the ports. Clean the component mating faces. Lubricate and install the new O-rings. Install the A/C pipes. Tighten the bolts to 6 Nm (4 lb.ft).
5. Recharge the A/C system. Refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/land-rover/range-rover/l322-2009-2012/remont/ac-compressor/#climate-control-system-general-information) .
6. Install the plenum chamber. Refer to «Plenum Chamber»(/land-rover/range-rover/l322-2009-2012/remont/automatic-hvac-system/#air-distribution-and-filtering) .
7. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2009-2012/remont/charging-system/#battery-and-charging-system-general-information) .

See also:
• Auxiliary Climate Control
• Climate Control System
• Specifications
• Steering Gear - 5.0L SC V8 - AJ133, LHD AWD
• Steering Gear - 5.0L NA V8 - AJ133, LHD AWD
• SUPERCHARGER COOLING SYSTEM DRAINING, FILLING AND BLEEDING - GENERAL PROCEDURES
• Hood Latch Panel
• Air Cleaner RH
• Standard Workshop Practices
• HEATING AND VENTILATION
• Plenum Chamber
• Condenser Core - 5.0L NA V8 - AJ133