2010 JAGUAR XFR air filter

Climate Control - Air Distribution and Filtering - Overview
Description and Operation

Overview Published: 11-May-2011

The air distribution and filtering system controls the distribution and quality of air supplied to the passenger compartment. The
system comprises of a pollen filter and a number of ducts, vents and registers.

Published: 11-May-2011
Climate Control - Air Distribution and Filtering - System Operation and
Component Description
Description and Operation

Control Diagram

NOTE: A = Hardwired; N = Medium speed CAN (controller area network) bus; O = LIN (local interconnect network) bus; P
= Media orientated system transport (MOST) ring.



Item Description 1 Battery 2 BJB (battery junction box) 3 CJB (central junction box) 4 Touch screen display (TSD) 5 Information and entertainment module

1 Air inlet duct 2 Pollen filter 3 Cover The pollen filter removes odors and fine particles from fresh air entering the passenger compartment. The pollen filter is
located in the air inlet duct, in the inlet to the blower. A cover on the underside of the air inlet duct provides access to the
pollen filter for servicing.

Touch screen display (TSD) 6 Integrated control panel 7 Information control module 8 ATC (automatic temperature control) module 9 Face/Feet distribution stepper motor 10 RH (right-hand) temperature blend stepper motor 11 LH (left-hand) temperature blend stepper motor 12 Windshield (defrost) distribution stepper motor 13 Blower control module 14 RJB (rear junction box) 15 Blower
System Operation
Operation of the heating and ventilation system is controlled by the ATC module. Refer to: Control Components (412-01 Climate Control, Description and Operation).
The system can be operated in automatic or manual mode, with temperature settings selected using the switches on the
integrated control panel.

When the engine is running, coolant is constantly circulated through the heater core by the engine coolant pump and the
auxiliary coolant pump. Where fitted, the auxiliary coolant pump is energized by the CJB on receipt of medium speed CAN bus signals from the ATC module. The CJB broadcasts auxiliary coolant pump status over the medium speed CAN bus for use by other vehicle systems.

The blower is supplied with power by the blower relay on the RJB and connected to ground via the blower control module. The blower control module regulates the voltage across the blower motor to control blower speed. The voltage set by the blower
control module is controlled by a PWM (pulse width modulation) signal from the ATC module. The ATC module uses a feedback signal from the blower control module to monitor blower speed.
Refer to: Control Components (412-01 Climate Control, Description and Operation).


Heater Assembly Component Description

The heater assembly controls the temperature and flow of air supplied to the air distribution ducts. The heater assembly is
mounted on the vehicle centerline, between the instrument panel and the engine bulkhead.

The heater assembly consists of a casing that contains an A/C (air conditioning) evaporator, a heater core, two air distribution
control doors and two temperature blend control doors. On 2.7L diesel vehicles, the heater assembly also contains an electric
booster heater.
Refer to: Electric Booster Heater (412-02 Auxiliary Climate Control, Description and Operation).
Mounted on the heater casing are four stepper motors. Each of the stepper motors is connected to either an air distribution
control door or a temperature blend control door.
The A/C evaporator is part of the A/C system. Refer to: Air Conditioning (412-01 Climate Control, Description and Operation).
The heater core provides the heat source to warm the air supplied to the passenger compartment. The heater core is an
aluminum two 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. For additional
information, refer to:
Engine Cooling (303-03A, Description and Operation),
Engine Cooling (303-03B Engine Cooling - V6 3.0L Petrol, Description and Operation), Engine Cooling (303-03C, Description and Operation).

Air Inlet Duct

The air inlet duct connects the fresh air inlet in the engine bulkhead to the heater assembly. The air inlet duct is installed
behind the instrument panel on the passenger side.

The air inlet duct consists of a casing that contains a pollen filter, an air inlet door, a blower and a blower control module. A
recirculation air inlet is incorporated into the casing. A servo motor is mounted on the casing and connected to the air inlet
door, to allow selection between fresh and recirculated air.
Refer to: Control Components (412-01 Climate Control, Description and Operation). The pollen filter is part of the air distribution and filtering system.
Refer to: Air Distribution and Filtering (412-01 Climate Control, Description and Operation).
The blower regulates the volume of air flowing through the air inlet duct to the heater assembly. The blower consists of an
open hub, centrifugal fan and an electric motor.
The blower control module regulates the power supply to the blower motor. The blower control module is installed in the air

Published: 11-May-2011
Climate Control - Air Conditioning - System Operation and Component Description
Description and Operation


General System Operation

To accomplish the transfer of heat, refrigerant is circulated around a sealed system, where it passes through two
pressure/temperature regimes. In each of the regimes the refrigerant changes state, during which process maximum heat
absorption or dissipation occurs.

The low pressure/temperature regime is from the thermostatic expansion valve, through the evaporator to the compressor. The
refrigerant decreases in pressure and temperature at the thermostatic expansion valve, then changes state from a liquid to a
vapor in the evaporator to absorb heat.

The high pressure/temperature regime is from the compressor, through the condenser and receiver drier assembly to the
thermostatic expansion valve. The refrigerant increases in pressure and temperature as it passes through the compressor, then
releases heat and changes state from a vapor to a liquid in the condenser.

Operation of the A/C (air conditioning) system is controlled by the ATC (automatic temperature control) module.
Refer to: Control Components (412-01 Climate Control, Description and Operation). The A/C system works in conjunction with: The air distribution and filtering system.
Refer to: Air Distribution and Filtering (412-01 Climate Control, Description and Operation). The heating and ventilation system.
Refer to: Heating and Ventilation (412-01 Climate Control, Description and Operation).

Item Description 1 RH (right-hand) end tank 2 Condenser core 3 LH (left-hand) end tank 4 Mounting brackets (4 off) 5 High pressure compressor discharge line connector block 6 High pressure liquid outlet line connector block 7 Receiver/Drier outlet pipe 8 Receiver/Drier inlet pipe 9 Receiver/Drier The condenser transfers heat from the refrigerant to the surrounding air to convert the high pressure vapor from the
compressor into a liquid. The condenser is installed immediately in front of the radiator. Two brackets on each end tank attach
the condenser to the end tanks of the radiator.

The condenser is classified as a sub-cooling condenser and consists of a fin and tube heat exchanger core installed between
two end tanks. Divisions in the end tanks separate the heat exchanger into a four pass upper (condenser) section and a two
pass lower (sub-cooler) section.

The LH end tank provides the connections to the high pressure line from the A/C compressor and the high pressure liquid line to the evaporator.
The RH end tank provides the connections to the receiver drier.
Receiver Drier

The receiver drier is integrated into the RH end tank of the condenser to remove solid impurities and moisture from the refrigerant. It also provides a reservoir for liquid refrigerant to accommodate changes of heat load at the evaporator.


NOTE: The receiver drier is part of the condenser assembly and is not serviceable separately.

Refrigerant entering the receiver drier passes through a filter and a desiccant pack, then collects in the base of the unit before
flowing through the outlet pipe back to the condenser. Condenser

(414-01 Battery, Mounting and Cables, General Procedures).

6. Disconnect the generator electrical connectors.

7. Remove the windshield glass.
For additional information, refer to: Windshield Glass (501-11 Glass, Frames and Mechanisms, Removal and Installation).

8. Remove the rear window glass.
For additional information, refer to: Rear Window Glass (501-11 Glass, Frames and Mechanisms, Removal and Installation).

9. Remove the roof opening panel frame.
For additional information, refer to: Roof Opening Panel Frame (501-17 Roof Opening Panel, Removal and Installation).

10. Remove the driver and passenger side front scuff plate trim panels.
For additional information, refer to: Front Scuff Plate Trim Panel (501-05 Interior Trim and Ornamentation, Removal and Installation).

11. Remove the driver and passenger side rear scuff plate trim panels.
For additional information, refer to: Rear Scuff Plate Trim Panel (501-05 Interior Trim and Ornamentation, Removal and Installation).

12. Remove the driver and passenger side air curtain modules.
For additional information, refer to: Side Air Curtain Module (501-20B Supplemental Restraint System, Removal and Installation).

13. Remove the rear seat backrest.

14. Remove the driver and passenger side rear safety belt retractors.
For additional information, refer to: Rear Safety Belt Retractor (501-20A Safety Belt System, Removal and Installation).

15. Remove the rear center safety belt retractor.
For additional information, refer to: Rear Center Safety Belt Retractor (501-20A Safety Belt System, Removal and Installation).

16. Remove the driver and passenger side RF filters.

17. Remove the diversity antenna module.

18. Remove the antenna.
For additional information, refer to: Navigation System Antenna (419-07 Navigation System, Removal and Installation).

19. Release and position the roof wiring harnesses to one side

20. Position the roof opening panel front and rear drain hoses to one side.

21. Remove the driver and passenger side roof mouldings.

22. Drill out the spot welds.
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(414-01 Battery, Mounting and Cables, General Procedures).

6. Disconnect the generator electrical connectors.

7. Remove the windshield glass.
For additional information, refer to: Windshield Glass (501-11 Glass, Frames and Mechanisms, Removal and Installation).

8. Remove the rear window glass.
For additional information, refer to: Rear Window Glass (501-11 Glass, Frames and Mechanisms, Removal and Installation).

9. Remove the headliner.
For additional information, refer to: Headliner (501-05 Interior Trim and Ornamentation, Removal and Installation).

10. Remove the driver and passenger side front scuff plate trim panels.
For additional information, refer to: Front Scuff Plate Trim Panel (501-05 Interior Trim and Ornamentation, Removal and Installation).

11. Remove the driver and passenger side rear scuff plate trim panels.
For additional information, refer to: Rear Scuff Plate Trim Panel (501-05 Interior Trim and Ornamentation, Removal and Installation).

12. Remove the driver and passenger side air curtain modules.
For additional information, refer to: Side Air Curtain Module (501-20B Supplemental Restraint System, Removal and Installation).

13. Remove the rear seat backrest.

14. Remove the driver and passenger side rear safety belt retractors.
For additional information, refer to: Rear Safety Belt Retractor (501-20A Safety Belt System, Removal and Installation).

15. Remove the rear center safety belt retractor.
For additional information, refer to: Rear Center Safety Belt Retractor (501-20A Safety Belt System, Removal and Installation).

16. Remove the driver and passenger side RF filters.

17. Remove the diversity antenna module.

18. Remove the antenna.
For additional information, refer to: Navigation System Antenna (419-07 Navigation System, Removal and Installation).

19. Release and position the roof wiring harnesses to one side

20. Remove the driver and passenger side roof mouldings.

21. Drill out the spot welds.