1998 JAGUAR X308 Amp

Climate Control System - General Informatio
n - Refrigerant Oil Adding
Gen
e
ral Procedures
CAUTION: Always decant fresh oil from a sealed container and do not leave oil exposed to the atmosphere. PAG oil is
very hygroscopic (absorbs wate r) and will rapidly attract atmospheric moisture. PAG oil must NEVER be mixed with mineral
based oils. Do not re-use oil following a recovery cycle, dispose of it safely.
Original Compressor

New Compressor
1. The amount of oi
l drawn out during a recovery procedure will
be dependent on the state of the system and the rate of
recovery. The quantity will be a pproximately 30 to 40 ml.; this
may vary, and the figure is given only for guidance.
The oil separator vessel in the recovery equipment must be
clean and empty at the start of the process, so that the quantity
of oil which is drawn out may be accurately measured.
• NOTE: The equipment manufactu rer's instructions must be
followed when adding oil directly into an original, or new unit,
owing to rectification work to the existing compressor, or the
need to fit a new compressor.
Oil may be added to the system either via the recovery, recycle
and recharge station or by us ing a proprietary oil injector.
Alternatively, if the compress or has been removed from the
vehicle, the oil may be added directly to the compressor.
1. From an existing compressor, drain the oil into a measuring
cylinder and record the amount. Fl ush the unit out with fresh oil
and drain thoroughly. Replenish the compressor with the same
amount of oil that was originally drained out and immediately
plug all orifices ready for refitting to the vehicle.
1. Drain and discard th e transit lubricating oil from the new
compressor before it is be fitted.
To avoid over-filling the system, an allowance must be made for
the quantity of oil found in the original compressor and the
quantity deposite d in the recovery equipment oil separator from
the charge recovery operation.
Typical example:
D rained
from original compressor - 50 ml.
R
e
covered from oil separator - 40 ml.
Q
u
antity to be put in new compressor - 50 + 40 = 90 ml.
2. The difference between the combined total quantity of
recovered and drained oil and the nominal capacity of the
system (180 ml.), is due to th e quantity of oil remaining in
components such as the cond enser, receiver drier or
evaporator. This oil is no t normally recoverable.
The same procedure may be followed if a problem has occurred
due to oil leakage, as the amount of oil lost is generally small. If
the recovery process has no t been necessary, because
refrigerant has also been lost, then only the quantity drained
from the original compress or needs to be replaced.

System Compon
ents


1.
Should a major component such as
condenser, receiver drier or

evaporator be renewed, then an adjustment to the system oil
content must be made. This ma y be carried out in the same
way as the examples for the compressor, except for the fact
that trapped oil within any of these components cannot
normally be recovered. An extr a quantity of oil should be
added, in addition to that re covered from the recovery station
separator, as follows:
Conden
ser - Add 40 ml.
Evaporator -

Add 40 ml.
Receiver drier -

No addition.

Engine speed (valve closed with the engine not running) Demand (set) temperature In-car temperature sensor Solar sensor
Re-heating of the refrigerated air is contro lled by the time that the water valve is open (i.e. not energised) over a six secon d
interval. The duty cycle of the water valve, the time open / time closed, is controlled by the A/CCM.
Maximum heating demand will cause the water valve to be fu lly open (not energised) to allow maximum coolant flow
through the heater matrix.
At Maximum cooling, the water va lve will be fully closed (energised) to prevent hot (engine temperature) coolant entering
the heater circuit; the pump however will continue to circulate coolant through both the heater matrix and water valve
bypass.
The water valve defaults open when the ignition is OFF.
Under engine stall conditions, when ignition is ON, the water valve will be open.
Water Pump Assembly
Located in the same area as the water valve, the water pump continually circulates coolant through the heater matrix
except when the conditions below apply:
The engine coolant is below 16°C. The ignition is OFF. Under engine stall conditions, when ignition is ON. Control panel OFF
Non return valves
The heater bypass hose has a non-return valve, located between the engine feed and return hoses. The valve prevents the
water pump from recirculating coolant fro m the heater at low engine speeds.
The flow indicator arrow embossed on the valve bo dy MUST point towards the coolant header tank.
CAUTION: Coolant flow will be compromi sed if either valve is fitted incorrectly. Observe the correct direction.
A second non-return valve is located betw een the water pump and water valve. This valve prevents hot coolant from flowing
into the heater with the engine switched off. The flow indicator arrow MUST point towards the water pump.
Heater feed and return hoses
The heater feed and return hoses are connected to the engine feed and return hoses by 'Quick-Fit' connection unions. The
feed hose has a Norma R20 connector and the return hose a Norma push and seal connector. The coolant system bleed
joints have Cobra clamps. All remaining hose connections have spring band hose clamps.
The engine feed hose is connected to the engine bypass hous ing and the engine return hose is connected to the engine
water pump.
Clamp Identification

Heating and Ventilation - Heater Core
Removal and Installation
Removal
Installation

1.
Drain radiator coolant only; re fer to 26.10.01 or (SC) 26.10.01.
2. Remove instrument panel for access; refer to 76.46.01.

3. Remove driver footwell duct.
Remove screw.
Remove duct.

4. Disconnect cool air bypass serv o motor connector and heater
matrix pipes.
1. Disconnect connector.
• NOTE: Position suitable clot h to absorb coolant leakage
before disconnecting pipes.
2. Remove screws and retaining brackets.
3. Remove screws and matrix clamps.
• NOTE: Discard O-ring seals from pipes; fit suitable
blanking plugs.
Detach pipes from matrix.

5. Remove heater matrix from heater/cooler assembly.
1. Remove screw.
2. Remove retaining plate.
Reposition instrument panel support bracket to permit
removal of heater matrix (RHD only).
3. Remove heater matrix.
1. NOTE: Lubricate and install new O-ring seals.
Installation is the reverse of removal procedure.

Air Conditioning - Air Conditioning (A/C) Compressor
Removal and Installation
Removal
1. Disconnect battery ground cable (IMPORTANT, see SRO
86.15.19 for further information).
2. Recover refrigerant from air co nditioning system; refer to
82.30.30.
3. Remove supercharger drive belt (where fitted); refer to
18.50.08.
4. Remove front end accessory dr ive belt; refer to 12.10.40 or
(SC) 12.10.40.

5. NOTE: A commercially availa ble brake pipe clamp is
recommended. Do not over tighten.
Clamp power steering reservoir to pump feed hose.
6. Raise vehicle for access

7. NOTE: Position drain tin to collect the fluid when union nut is
released.
Disconnect steering rack hose from pump. 1. Release union nut.
2. Discard O-ring.
3. Install suitable blanking plugs.

8. Disconnect clutch harness connector from compressor.
1. Disconnect connector.
9. Disconnect lines from compressor.
Discard O-rings.
Install suitable blanking plugs.

3. Install lines to compressor.
Install new O-ring seal and lubricate with clean
compressor oil.

4. Connect clutch harness connector to compressor.
1. Connect clutch connector.

5. Connect power steering hose to pump.
1. Remove blanking plugs.
2. Install new O-ring seal and lubricate with clean
compressor oil.
3. Tighten union nut.
6. Lower ramp.
7. Unclamp power steering rese rvoir to pump feed hose.

Ref #12 DEF (resumes the system on at the previous temperature setting).
Button (switch) logic
All buttons with an integral LED state lamp conform to the following operating logic.
When the state lamp is lit the relevant func tion is operational. From this condition, pressing the button will de-activate the
function, confirmed by the LED being de-energized and the pres ence of a single audible 'beep'. A single 'beep' will
accompany the state lamp to confirm function re-selection.
1. 1. ON / OFF and manual fan speed.
Pressing this knob activates the system ON at the last settin g or switches the system OFF. Rotate the knob clockwise to
increase and anti-clockwise to decrease fan speed and thus airflow.
With the system OFF, ram air is available by the selected air di stribution mode (indicated by state lamp). Air flow will NOT
occur unless a manual air distribution mo de is selected, this air being unconditioned and flow dependent upon vehicle
speed.
• NOTE: The blowers are inhibited until the engine coolant te mperature is > 35°C, unless DEFROST, FACE or DEMIST modes
are selected.
2. 2. Manual Air Recirculation
Closes the outside air intakes of the blower asse mblies and recirculates air within the vehicle.
Two options of control are available :
Timed Recirculation. Pressing the button for less than 1.5 seconds lights up the LED (confirmed by a single bleep).
This provides recirculation of interior air for a period of approximately 5 minutes. Pressing the button within five
minutes returns the system to fresh air intake mode.
Continuous Recirculation. Pressing and holding the button for more than 1.5 seconds lights up the LED (confirmed by two beeps). This provides continuous reci rculation of interior air. Pressing the button returns the system to fresh air
intake mode.
• NOTE: Avoid using manual air recirculatio n for prolonged periods in cold weather, this may result in interior misting of
glass.
3. 3. Temperature Scale Selection
Press the appropriate button to display temperatures in degrees Celsius or Fahrenheit.
4. 4. Manual Fan Speed
Rotating the fan speed control knob (to vary fan speed) will di splay a proportional number of horizontal bars on the LCD.
There are total of eleven manual fan speeds available.
5. 5. Temperature Display
Indicator of internal demand temperatur e or external ambient temperature. The external ambient is updated every 4
seconds when the road speed > 25 km / h.
6. 6. Scale
Selected temperature scale, Celsius or Fahrenheit.
7. 7. External temperature
Symbol indicates when this option is selected

8.8. Automatic
Symbol indicates when the control of , temperature, fan speed and air distribution are all in Auto mode.
9. 9. External
There are two modes of external ambient temperature selection;
Quick Display. Pressing the button for <1.5 seconds (con firmed by a single bleep) will display the external
temperature for 4 seconds.
Continuous Display. Pressing and holding the button fo r >1.5 seconds (confirmed by two beeps) displays the
external ambient temperature continuously, the value of which will be updated every 4 seconds given that vehicle
road speed is > 25 km/h. Pressing the button again fo r <1.5 seconds resets to the previous display.
• NOTE: Continuous external temperature display will be cancel led when the ignition is switched OFF but not during engine
cranking.
10. 10. A/C
This push-on / push-off button will either select or deselect (as indicated by the state lamp) the refrigeration system.
The refrigeration system is automatically engaged when the Auto button is pressed.
• NOTE: Interior misting of screens may be reduced by continuous operation of th e refrigeration system.
11. 11. Auto
When selected and the state lamp lit, A/C mode will be operat ional and control of vent outlet temperature, fans speed and
air distribution will be automatic.
AUTO mode will disengage should manual air distribution or defrost buttons be operated or the manual fan speed knob be
rotated.
• NOTE: Automatic temperature control is constantly main tained irrespective of selected manual overrides.
12. 12. Defrost
Push-on push-off button, which when engaged will direct all air to the front and side glass at maximum fan speed. The
heated windshield (if fitted) will also be energized for a timed cycle of 6,5 minute s, but may be cancelled by pressing the
HEATED WINDSHIELD (F) button. Pressing 'DEF' again will retu rn to the last setting with automatic temperature control
being maintained.
Directing warm and humid air onto a cold screen can produce interior misting of screens. Operating the climate control
system without the refrigerati on system operating will exacerbate this problem.
• NOTE: Directing cold air onto the screen in warm humid conditions can produce external condensation.
13. 13. Heated Windshield (F)
Pressing the heated windshield button (whe re fitted) will energize the electrically heated windshield elements for a timed
cycle of 6,5 minutes; pressing the button again will cancel the request. Should the engine stall or the ignition be turned
OFF, the timer will be cleare d and the function cancelled.
• NOTE: The heated windshield may be activated with the cl imate control system OFF but the engine must be running.
In very cold ambient temperatures, icing of the interior of the glass is possible when the climate control system is operating
in AUTO mode; to reduce this poss ibility the A/CCM provides automatic operation of the heated windshield.
With the following conditions met, the heated windshield will automatically energize but the state lamp will NOT be lit.