Climate Control: Overview Jaguar XF I

OVERVIEW

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.

SYSTEM OPERATION AND COMPONENT DESCRIPTION

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

The heating and ventilation system controls the temperature and flow of air supplied to the passenger compartment. The system is a dual zone automatic system, which can provide different temperature settings for the left-hand (LH) and right-hand (RH) sides of the passenger compartment.

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

Operation of the heating and ventilation system is controlled by the automatic temperature control (ATC) module. See Control Components .

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 central junction box (CJB) on receipt of medium speed controller area network (CAN) bus signals from the automatic temperature control (ATC) module. The central junction box (CJB) broadcasts auxiliary coolant pump status over the medium speed controller area network (CAN) bus for use by other vehicle systems.

The blower is supplied with power by the blower relay on the rear junction box (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 pulse width modulation (PWM) signal from the automatic temperature control (ATC) module. The automatic temperature control (ATC) module uses a feedback signal from the blower control module to monitor blower speed. See Control Components .

The air conditioning (A/C) system transfers heat from the passenger compartment to the outside atmosphere to provide the heater assembly with dehumidified cold air. It is a sealed, closed loop system 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 air conditioning (A/C) compressor.

The climate control system is controlled by the automatic temperature control (ATC) module. It controls the heating and ventilation system and the air conditioning (A/C) system to regulate the temperature, volume and distribution of air into the passenger compartment. The system is a fully automatic dual zone system capable of maintaining individual temperature levels selected for the left-hand (LH) and right-hand (RH) sides of the passenger compartment, up to a maximum differential of approximately 3°C (5.4°F). Manual overrides for the system include inlet air source, blower speed and air distribution. These selections can be made using either the soft switches on the home and climate control screens of the touch screen display (TSD), or the switches on the integrated control panel.

The automatic temperature control (ATC) module also controls

1. The rear window heater.
2. The windshield heater (where fitted).
3. The exterior mirror heaters.
4. The seat heaters (where fitted).
5. The steering wheel heater.

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