1994 JAGUAR XJ6 coolant temperature

Climate Control Systems
14.4 TEMPERATURE CONTROL
14.4.1 Coolant Circuit
The main coolant system supplies liquid at engine temperature to the heater matrix to provide heat to the vehicle
interior. Unlike previous air blend / constant matrix temperature systems, in-car temperature is now controlled by
mixing recirculated coolant in the heater circuit with engine-temperature coolant. Matrix temperature is controlled
by a valve which opens to raise temperature (admit engine coolant) and closes to reduce it (recirculates coolant within
the circuit). The coolant flow valve operates on a six (6) second 'duty cycle', during which it may be open for whatever
period thecontrol system dictates. FACEvent airtemperature of howeveriscontrolled bythe'cool air by-passdamper'
which allows incoming air to flow around the top of the the heater matrix and thus remain unheated.
Because the engine coolant pump is driven proportionally to engine speed, the coolant delivery rate changes with
engine revolutions thus causing temperature variations. To stabilize the flow through the matrix, and thus the
temperature, an electrically driven circulation pump has been introduced into the system.
1
1. Engine 2. Coolant flow valve 3. Circulation pump
4. Heater matrix
5. Bottom hose
6. Engine cooling system radiator
Fig.
1 Coolant circuit, schematic view
Issue 1 August 1994 6 X300 VSM

Climate Control Systems
Manual Inputs
Automatic inputs
outputs
14.5 AIR CONDITIONING CONTROL MODULE (A/CCM)
14.5.1 Description
Theclimate control system peripheralscommunicate with theA/CCMvia three main devicecategories, plusthevehicle
power supply and ground connections.
Control panel Face Vent Temperature Control
Temperature and solar sensors
Flap
servo motor potentiometers
Circulation pump
& coolant flow valve
Power
transistor(fan speed control)
Compressor lock sensor
(12 cylinder only)
Instrument pack (coolant temp
& road speed) (engine revolutions via engine control module)
Blower motors (Left
& Right) & associated relays
Flap
servo motors
Heated front
/ rear screens & exterior mirror relays
Motorized in
-car aspirator
Compressor clutch request to engine control module (not
heater-only cars)
Circulation pump relay
Coolant flow valve
X300 VSM Issue 1 August 1994 7

Climate Control Systems
. Centre vent flap
Foot flap
Defrost flap
I I
14.5.2 Control Module Interfaces
. Recirculation switch
. Air con onloff switch
. System onloff switch
. Auto. / Man. select
. Set temperature
. Air flow outlet mode set
. Heated front screen switch
. Heated rear screen &
. External temp. display
. FahrenheiVCentigrade
heated mirror switch
switch
switches
. Solar sensor
. Motorized in-car aspirator
. Ambient temp. sensor
9 Evaporator temp. sensor
. Heater matrix temp. sensor
. Compressor lock sensor
. Face differential temp. control
. Refrigerant pressure switch
. Engine speed signal
. Engine coolant temperature
Vehicle speed signal
Circulation pump
. Coolant flow valve
. Power transistor (fan speed
= Servo motor potentiometers:
signal
control)
LH air inlet flap
RH air inlet flap
Centre vent flap
Foot flap
Defrost flap
Air by
-pass flap
CONTROL PANEL
4
-
4
4
4
4
4
4
A 1 CCM
e I . External temp. display
. Coolant recirculation valve
. Coolant recirculation pump
Cool air by-pass
Air Flow Speed Control
. LH blower motor & power transistor
. RH blower motor & power transistor
. LH high speed relay
. RH high speed relay
. LH air inlet
. RH air inlet
. Compressor
- . Front screen heater (to EMS)
- . Heated rear screen
and door mirrors
Fig.
1 Schematic view AI CCM Inputs & Outputs
0
0
0
0
Issue 1 August 1994 8 X300 VSM

Climate Control Systems
lnsufficent Cooling
0 Sluggish blower motor(s).
0 Restricted blower inlet or outlet passage
0 Blocked or partially restricted condenser matrix or fins.
0 Blocked or partially restricted evaporator matrix.
0 Blocked or partially restricted filter in the receiver drier.
0 Blocked or partially restricted expansion valve.
0 Partially collapsed flexible pipe.
0 Expansion valve temperature sensor faulty (this sensor is integral with valve and is not serviceable).
0 Excessive moisture in the system.
0 Air in the system.
0 Low refrigerant charge - possible code 23.
0 Compressor clutch slipping.
0 Blower flaps or distribution vents closed or partially seized - possible codes 41 or 46.
0 Coolant flow valve not closed.
0 Evaporator sensor incorrectly positioned
m: Should a leakor low refrigerant be established as the cause of /NSUff/C/€NTCOOL/NG,followthe procedures
Recovery / Recycle / Recharge, this section, and observe all refrigerant and oil handling instructions.
lntermiffent Cooling
0 Is the electrical circuit to the compressor clutch consistent?
0 Is the electrical circuit to the blower motor(s) consistent?
0 Compressor clutch slipping?
0 Motorized in-car aspirator or evaporator temperature sensor faulty, causing temperature variations - possible
codes 11 or 13.
0 Blocked or partially restricted evaporator or condenser.
Noisy System
0 Loose or damaged compressor drive belt.
0 Loose or damaged compressor mountings.
0 Compressor oil level low, look for evidence of leakage.
0 Compressor damage caused by low oil level or internal debris.
0 Blower motor(s) noisy.
0 Excessive refrigerant charge, witnessed by vibration and 'thumping' in the high pressure line (may be indicated
by high HIGH & high LOW side pressures).
0 Low refrigerant charge causing 'hissing' at the expansion valve (may be indicated by low HIGH side pressure).
0 Excessive moisture in the system causing expansion valve noise.
0 Air-lock in water pump*.
lnsufficent Heating
0 Coolant flow valve stuck in the closed position.
0 Motorized in-car aspirator seized.
0 Cool air by-pass damper stuck or seized - possible code 43.
0 Blocked or restricted blower inlet or outlet.
0 Low coolant level.
0 Blower fan speed low.
0 Coolant thermostat faulty or seized open.
0 Water pump inoperative or blocked
0 Air-lock in matrix*.
m: * Please see Sections 4.1 and 4.2 for specific coolant fill / bleed procedures.
Electrical faults may be more rapidly traced using
(JDE), please refer to the (EDM).
Issue 1 August 1994 16 X300 VSM

Electrical rl
15.2 INSTRUMENTS
15.2.1 General Description
The instruments measure, monitor and display data relevant to the vehicle’s performance. Data is received from
sensors positioned at various locations around the vehicle via two multi-pin sockets located at the rear of the
instrument panel and is than presented using three different visual display methods described as follows:
15.2.2 Analog Display
This is used to display road speed, engine speed, oil pressure, battery condition, fuel level and coolant temperature.
15.2.3 Indicator Lamps
These indicate the presence of any hazard /fault conditions or operational actions.
15.2.4 LCD (Liquid Crystal Disp/ay)
This single line, six digit seven segment display is normally used to display the odometer reading but can also be used
to display vehicle condition messages associated with particular warning lamps and trip computer information.
15.2.5 Transducers
These devices listed as follows transmit vehicle condition to the instruments:
0 Engine Coolant Temperature Transmitter
0 Low Coolant Level Probe
0 Oil Pressure Transmitter - AJ16N12
0 Fuel Gauge Tank Unit - AJlW12
Fault conditions and their causes displayed by the instruments and warning lamps are covered in more detail
by further information contained within the
Electrical Diagnostic Manual.
15.2.6 Instrument Panel, General
2 I I 3 1
1. 24 Way Connector 3. Identification Label 2. 4% Way Connector 4. Bulb Holder
Fig.
1 Instrument Panel, Rear View
X300 VSM Issue 1 August 1994 8
c

31
30
29
28 27
26
4 26 24 21 23 22 7 20 19 18 18 17 8
a
10
11
12
13
14
1s
1M-137
1. Tachometer 2. Speedometer
3. Battery Condition 4. FuelGauge 5. Oil Pressure 6. Coolant Temperature 7. Odometer /Trip Computer Display 8. Primary Warning Indicators (RED) 9. Exhaust Temperature 10. Low Oil Pressure 11. Seat Belt Not Fastened 12. Boot Open 13. DoorOpen 14. Coolant Level 15. Air Bag Fault 16. Status / Warning Lamps
17. Hand Brake On (RED) 18. Brake System Fault (RED)
19. Main Beam On (BLUE) 20. Direction Indicator Right (GREEN) 21. Status / Warning Lamps 22. Direction Indicator Left (GREEN) 23. Traction Control Off (GREEN) 24. Transmission Sport Mode (GREEN) 25. Charging Fault (RED) 26. Check Engine (AMBER)
27. Low Fuel Level (AMBER) 28. Anti - Lock Fault (AMBER) 29. Traction Control Fail (AMBER) 30. Bulb Fail (AMBER) 31. Washer Fluid Level (AMBER) 32. Transmission Fault (AMBER)
Fig.
1 Instrument Panel, Front Mew
w: The 'Premium Unleaded Fuel Only' caution is added to the Federal Market vehicles, also 'PARK BRAKE and
'BRAKE' replace international symbols used in all other markets.
m: Six cylinder vehicle version shown; the tachometer red-line on 12 cylinder vehicles starts at 6000 RPM.
The front of the
PECUSprogrammable instrument panel features 6 analog gauges, 22 warning lamps /tell tales and
a Liquid Crystal Display (LCD), the rear of the panel accommodates two PCB mounted connectors, one 24-way
connector, one 48-way connector, one instrument panel identification label and 14 light bulbs arranged in groups of
seven on either side. Three power inputs and two ground inputs are provided for 'POWER UP' and 'POWER DOWN'
sequence, the three power inputs comprising battery, ignition and auxiliary. The instruments are protected by a
housing
/ lens assembly.
15.2.7 Gauges
The two major gauges are tachometer and speedometer, and the four minor gauges indicate battery condition, fuel
level, oil pressure and coolant temperature.
Each gauge is contained
in a sealed non-serviceable can and must be renewed as a complete unit in case of any
damage.
CAUTION: Extreme care should be exercised when renewing instrument pand components to avoid damago to the delicate indicator needles.
X300 VSM 9 Issue 1 August 1994

0 LUBRICANTSAND FLUIDS
Engine
Oil
Specification ....................................................... A.P.I. SG I CD or
A.P.I. SH (when available)
SAE Viscosity Range
............................................... 5w 120 - 20w J 50
dependent on ambient temperature
6 cyi. (3.2L and 4.0L) ............................................. 8 liters
VI2 ............................................................ 10liters
Capacities
Manual Transmission (3.21 & 4.01)
Fluid Specification ................................................. Dexron IlD, Dexron IIE
Capacity.. ......................................................... 1,4 liters
Rear Axle Fluid
Specification ....................................................... A.P.I. GL5
Fluid Make &Type
................................................. Shell Spirax Super 90 oil
SAE
Viscosity Rating
............................................... EP 90
(alternative brands may be used for
top
-up only when Shell Spirax is not
available)
0
Capacity (all vehicles) .............................................. 2,l liters
Power Assisted Steering
Preferred fluid ..................................................... Dexron IIE
Alternative fluid .................................................... Dexron IID (use only when Dexron IIE is not available)
Capacity
........................................................... 1,0 liter approximately
Cooling System
Coolant Mixture Specification ....................................... 50% plain water, 50% Jaguar Anti - freeze, Coolant and Corrosion
Inhibitor conforming to specification ESBM97B49A (for
frost protection down to -36OC (-33OF))
Capacities:
6
cyl. (3.2L and 4.OL normally aspirated)
initial
fill ....................................................... 12 liters
drain and refill
.................................................. 7,7 liters
6cyl. (4.0L SC)
initial
fill ........................................................ 13,5 liters
drain and refill .................................................. 9,25 liters
initial
fill.. ...................................................... 19,2 liters
drain and refill .................................................. 14,5 liters
VI 2
Issue 1 August 1994 X300 VSM AI-95MY 7

Description Capacity Type
Door guard lamp. 12V 5W Capless long life
Flasher side repeater 12V 5W Capless long life
Fog lamp - Front. 12v 55w Halogen H3
Fog lamp
- Rear guard 12v 21w Bayonet long life
Front turn indicator
I 12v21w I Bayonet long life
Pilot lamp
I 12V 5W I Capless long life
Headlamp
I 12v55w I Halogen HI
High mounted stop lamp (where fitted). 12v Capless long life
Roof console central courtesy lamp
12V 5W Capless long life.
Roof console reading lamp
12V 6W Capless
Luggage compartment lamp
12V 5W Capless long life
License plate lamp 12V 5W Festoon
Rear turn indicator
12v 21w Bayonet yellow long
Rear quarter courtesy lamp (lower section)
12V 5W Capless long life
Rear quarter reading lamp (upper section) 12V 6W Capless
Back
-up lamp 12v 21w Bayonet long life
Stop /Tail lamp
Sun visor vanity mirror lamp
12v 1,2w Capless 286
Tail lamp 12V 5W Bayonet long life
5X5W
12V 21V 5W Twin filament bayonet long life
Indicator bulbs
Bulb Designation Holder Colour Rating
Exhaust temperature warning indicator bulb Orange 12,5V 1,2W
Low oil pressure indicator bulb
Orange 12,5V 1,2W
Seat belt warning indicator bulb
Orange 12,5V 1,2W
Boot open warning indicator bulb
Orange 12,5V 1,2W
Door open warning indicator bulb
Orange 12,5V 1,2W
Coolant level warning indicator bulb
Orange 12,5V 1,2W
Air bag fault indicator bulb Orange 12,5V 1,2W
Parking brake 'on' indicator bulb Orange 12,5V 1,2W
Brake system warning indicator bulb Orange 12,5V 1,2W
Main beam 'on' indicator bulb
Orange 12,5V 1,2W
Right turn indicator bulb Orange 12,5V 1,2W
LCD illumination bulb (right)
Orange 12,5V 1,2W
LCD illumination bulb (left) Orange 12,5V 1,2W
Left turn indicator bulb
Orange 12,5V 1,2W
Traction control 'off indicator bulb
Orange 12,5V 1,2W
Transmission sport mode indicator bulb
Orange 12,5V 1,2W
Charging fault warning bulb
Orange 12,5V 1,2W
Check engine warning indicator bulb Orange 12,5V 1,2W
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0
0
X300 VSM Issue 1 August 1994 AI-95MY 12