Jaguar XJ (2008 year). Service manual — part 46

185

Climate Control

R

Use of air recirculation

The air conditioner/heater system is
supplied with fresh air via an intake flap.

Closing the flap causes the air inside the
vehicle to be recirculated. This helps to
prevent unpleasant odours from being
drawn into the vehicle and also to improve
the performance of the air conditioner in
very hot conditions. However, the use of
recirculated air will cause screen misting
after a short period and should only be
used as necessary.

In AUTO mode, the air intake flap is
controlled automatically. If required, air
recirculation may be manually selected
for either a short or indefinite period.

!

WARNING:

To prevent humidity build up inside the
vehicle and possible screen misting,
avoid driving with the air conditioning
system off or with manual air
recirculation selected for prolonged
periods.

GENERAL POINTS

To ensure the satisfactory operation of
the climate control system, note the
following points:
• Ensure that the external grille at the

base of the windshield, which
provides fresh air for the climate
control system, is kept clear of leaves,
snow or obstructions.

• A solar sensor, see item 1 on the next

page, is mounted on the centre top of
the facia. Ensure that this sensor is
not covered.

• Temperature and humidity sensors,

see item 2 on the next page, are
located behind the small grille. Do not
cover or obstruct the opening.

• Air ducts under the front seats supply

the rear passenger footwells (see air
distribution illustration). Objects or
material placed under the seats may
block or obstruct the open ducts.

• The external air intake to the air

conditioner/heater system is fitted
with a filter. Ensure that the filter is
changed at the specified service
intervals to maintain efficient
operation.

• If the air conditioning system is not

used frequently, it should be run
briefly at least once each week, with a
cold setting, to prevent the seals from
drying out with subsequent refrigerant
leaks.

• Moisture removed from the air by the

air conditioning unit is discharged
onto the road underneath the vehicle.
After stopping, puddles of water may
form underneath the vehicle.

Climate Control

186

L

AIR DISTRIBUTION

1. Solar sensor.

2. Temperature and humidity sensors.

The illustration above shows the location
of the air vents within the vehicle. The
airflow from the facia face level vents is
regulated using thumbwheel controls and
adjustable direction vanes.

Air distribution between the windshield,
facia and floor levels is selected
automatically when operating in AUTO
mode, but can be selected manually.

JAG0644

187

Front Climate Controls

R

Front Climate Controls

FRONT CONTROL PANEL

1. Blower speed and system On/Off.

2. Display panel.

3. Fahrenheit/Celsius selector.

4. Air conditioner on/off.

5. Select automatic operation.

6. Recirculation/fresh air.

7. Increase right zone temperature.

8. Decrease right zone temperature.

9. Select air distribution.

10. Heated rear screen/door mirrors.

11. Heated front screen (optional).

12. Defrost windows.

13. Select dual/single temperature zone.

14. Increase left zone temperature.

15. Decrease left zone temperature.

16. Option without front screen heater.

The climate control functions are selected
by push buttons and a rotary control.
When a button is pressed, selection of the
function is confirmed by a beep; most
buttons also have an illuminated LED.

Many system functions also have graphic
symbols displayed on the LCD (Liquid
Crystal Display) screen.

Automatic control (AUTO) may be
overridden at any time. Defrost/demist
operation is available and also manual
selection of blower speed, air distribution,
recirculation, air conditioning and
windshield heating.

Panel illumination

With the exterior lighting switched on, the
graphics on the panel controls are
illuminated by low level backlighting.

JAG0645

Front Climate Controls

188

L

The illumination level is adjusted by the
common instrument panel dimmer
control (see page 138).

TO SWITCH THE SYSTEM ON

The climate control system operates in
position II of the ignition switch.

With the ignition key turned to the run
position, the system will switch on in the
operating mode last set.

For normal usage select AUTO mode.

AUTO mode

Automatic operation provides a
controlled environment over a
temperature range of 17°C to 31°C
(61°F to 89°F) and should be regarded as
the normal operating mode.

To select automatic climate
control press the AUTO
button; the word AUTO

appears on the LCD screen to confirm
selection.

Front and rear screen heating and timed
air recirculation may be selected in AUTO
mode. Selecting any other control will
cancel AUTO operation.

Automatic operation cannot be
deselected using the AUTO button. To
exit AUTO mode, select another mode or
press the blower control knob to switch
the system off.

Temperature selection

Separate controls allow
the driver and front
passenger zone

temperatures to be independently
adjusted. Press the red buttons to
increase temperature and the blue
buttons to decrease temperature.

Both driver and front passenger selected
temperatures are always displayed.

Pressing the driver’s buttons to select the
maximum or minimum temperature
settings causes the display to change to
HI or LO respectively and cancel
AUTO mode.

To quickly jump from HI or LO to a
convenient midrange temperature of
23°C (73°F), press and hold AUTO for a
few seconds.

Dual temperature zones

With the DUAL button LED
illuminated, the system provides
separate temperature control of

the driver and front passenger zones.

Press DUAL to deselect dual temperature
control (LED off); the front passenger
temperature will change to that of the
driver side. Using the driver side
temperature control buttons will now
change both zone temperatures together.

To select dual temperature control, press
either the DUAL button or one of the front
passenger side red/blue temperature
control buttons. The DUAL LED is
illuminated.

External temperature

The external (EXT) temperature is
displayed at the top of the screen.

Press the button to change the
scale between degrees
Fahrenheit (°F) and degrees
Celsius (°C) for the displayed

internal and external (EXT) temperatures.