charging LAND ROVER DISCOVERY 1995 User Guide

82AIR CONDITIONING
6
REPAIR CONDENSER
Service repair no - 82.15.07
Remove
1.Disconnect battery negative lead.
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
2.Recover refrigerant from system.
See
Adjustment, Refrigerant Recovery Recycling
Recharging
3.Remove front grille panel.
4.Remove battery.
See ELECTRICAL, Repair,
Battery
5.Remove radiator and oil coolers assembly.See
COOLING SYSTEM, Repair, Radiator
6.Disconnect high and low pressure pipes at
condenser unions.
7.Discard 'O' ring seal from each union.
8.Remove 2 bolts securing condenser to body.
9.Pull condenser into radiator area.
10.Disconnect multiplug from each fan lead.
11.Remove condenser assembly.
Do not carry out
further dismantling if component is removed
for access only.
Blank off inlet and outlet ports.

AIR CONDITIONING
7
REPAIR
12.Disconnect receiver/drier pipes at condenser
unions.
13.Remove retaining bracket from side pipe.
14.Remove LH pipe from condenser and discard 'O'
ring.
15.Remove 2 screws securing receiver/drier
bracket.
16.Release pipes from lower clips and remove
receiver/drier assembly.
17.Remove 'O' ring from RH pipe
18.Remove 2 screws securing lower end of each
fan motor.
19.Remove 2 bolts and remove condenser lower
mounting bracket.
20.Remove 2 bolts and securing condenser upper
mounting bracket.
21.Remove upper mounting bracket and fan motor
assembly.
22.Remove 2 screws securing each side mounting
bracket and remove the brackets.
23.Transfer parts removed to new condenser.
24.Add 40 ml of refrigerant oil to new compressor to
compensate for oil loss.
Refit
25.Reverse removal procedure. 3 to 11.
26.Evacuate and recharge air conditioning system.
See Adjustment, Refrigerant Recovery
Recycling Recharging
27.Carry out leak test on disturbed joints.See
Adjustment, Leak Test System
28.Check air conditioning operation by carrying out
a System Test.
See Adjustment, System Test
CONDENSER FANS AND MOTORS
Service repair no - 82.15.01 - Motor
Service repair no - 82.15.03 - Fan
Remove
1.Remove condenser assembly.
See Condenser
2.Remove 4 bolts securing fan cowl to condenser.
3.Remove 3 bolts securing fan motor to cowl.
4.Remove fan motor assembly.
5.Remove 3 screws securing fan blades to motor.
6.Remove fan blades.
Refit
7.Reverse removal procedure. Ensuring that wiring
is clipped and no fouling of fan blade can occur.

82AIR CONDITIONING
8
REPAIR HEATER AND COOLER UNIT
Service repair no - 86.25.21
WARNING: All work involving the service
and maintenance of air conditioning
requires special equipment, knowledge,
experience and a full awareness and adherence to
safety precautions.
Remove
1.Disconnect battery negative lead.
2.Drain engine coolant.
See COOLING SYSTEM,
Adjustment, Coolant
3.Recover refrigerant from air conditioning system.
See Adjustment, Refrigerant Recovery
Recycling Recharging
4.Remove fascia panel assembly.See CHASSIS
AND BODY, Repair, Dash Panel Assembly
5.Release clips and disconnect coolant hoses
from heater pipes.
6.Remove securing bolt and disconnect low
pressure pipe from evaporator.
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
7.Release 'P' clip retaining high and low pressure
pipes.
8.Remove securing bolt and disconnect high
pressure pipe from evaporator.
9.Discard 'O' ring seals.

AIR CONDITIONING
9
REPAIR
10.Disconnect multiplug connecting heater to
blower unit, remove 3 screws and remove
blower unit.
11.Remove 5 screws securing casing to bulkhead
and tunnel.
12.Remove 2 securing bolts and remove centre
console front mounting bracket.
13.Disconnect 2 drain tubes..
14.Ease heater and cooler unit from its location and
remove from vehicle.
Refit
15.Ease heater and cooler unit into position.
16.Fit retaining bolts finger tight. Tighten in
sequence, centre and top bolts and then the
bottom bolt.
17.Reverse removal procedure.
18.Use new 'O' rings and lubricate with refrigerant
oil.
19.Evacuate and recharge system.
See
Adjustment, Refrigerant Recovery Recycling
Recharging
20.Leak test any disturbed joints.See Adjustment,
Leak Test System
21.Perform a functional check.EVAPORATOR AND EXPANSION VALVE
Service repair no - 86.25.20 - Evaporator
Service repair no - 86.25.01 - Expansion valve
Remove
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
1.Remove heater and cooler unit.
See Heater
and Cooler Unit

82AIR CONDITIONING
10
REPAIR 2.Disconnect 2 Lucar connectors from thermostat.
3.Position wiring aside.
4.Remove 2 screws securing heater pipe bracket
and position pipes aside.
5.Remove 10 clips retaining upper and lower
casings.
6.Remove 5 screws retaining upper casing.
7.Remove lower casing and evaporator.
8.Remove 4 clips securing evaporator top cover.
9.Remove evaporator top cover.
10.Remove thermostat sensor from evaporator
matrix.
11.Remove evaporator assembly from lower casing.
12.Remove bulkhead seal from case.
Expansion valve
13.Remove insulation from evaporator and
expansion valve connections.
14.Remove expansion valve sensor retaining clip.
15.Unscrew 2 pipe unions. Discard 'O' ring seals.
CAUTION: Use a second wrench to
support pipe adapters and plug
connections.
16.Remove expansion valve.
17.Unscrew pipe union. Discard 'O' ring seal.
18.Remove evaporator pipe.
Refit
19.Reverse removal procedure. Use new 'O' rings,
insulation and bulkhead seal.
NOTE: Use refrigerant oil on all 'O' rings
and mating surfaces. Tighten connection
See Specifications, torque, Torque Values
20.Wrap all exposed metal at hose connections with
prestite tape.
21.Evacuate and recharge system.
See
Adjustment, Refrigerant Recovery Recycling
Recharging
22.Leak test any disturbed joints.See Adjustment,
Leak Test System
23.Perform a functional check.
24.Disconnect service unit.

AIR CONDITIONING
11
REPAIR THERMOSTAT
Service repair no - 86.25.50
Remove
1.Remove heater and cooler unit.
See Heater
and Cooler Unit
2.Remove lower cover and evaporator.See
Evaporator and Expansion Valve
3.Remove 5 clips and screw securing evaporator
top cover.
4.Remove evaporator top cover.
5.Remove thermostat sensor from evaporator
matrix.
6.Remove 2 screws securing sensor unit.
7.Remove thermostat and insulation.
Refit
8.Reverse removal procedure.
CAUTION: The thermostat insulation must
be installed in the ORIGINAL POSITION in
the evaporator.EVAPORATOR/BLOWER MOTOR ASSEMBLY -
REAR
Service repair no - 82.26.01
Remove
1.Recover refrigerant from system.
See
Adjustment, refrigerant recovery recycling
recharging
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
2.Remove evaporator to alpine light duct.
See
evaporator to alpine light duct
3.Remove LH rear mud flap.See CHASSIS AND
BODY, Repair, mud flap - rear - lh
4.Clean area around low and high pressure air
conditioning pipe unions, beneath rear wheel
arch, to prevent any risk of dirt entering the
system.
5.Loosen and disconnect high and low pressure
air conditioning pipe unions beneath rear wheel
arch.
6.Remove and discard 'O' rings from pipe unions.
CAUTION: Use 2 spanners when loosening
or tightening air conditioning pipe unions.
CAUTION: Plug exposed connections
immediately.

82AIR CONDITIONING
12
REPAIR
7.Remove nut securing rear fold down seat
mounting frame to wheel arch.
8.Remove 5 bolts securing rear fold down seat
mounting frame.
NOTE: The rear fold down seat mounting
frame retaining nut is located in the LH
rear wheel arch.
9.Remove mounting frame.
10.Disconnect 2, main to rear air conditioning unit
harness multiplugs.
11.Remove 3 bolts securing evaporator/blower
motor assembly to body.
12.Release evaporator/blower motor assembly
pipes from body grommets.
13.Remove evaporator/blower motor assembly.Refit
14.Lubricate body grommets to aid fitment of
evaporator/blower motor assembly pipe unions.
15.Fit evaporator/blower motor assembly, feed pipe
unions through grommets and align to fittings.
16.Fit bolts securing evaporator/blower motor
assembly to body and tighten to
25 Nm.
17.Connect, main to rear air conditioning unit,
harness multiplugs.
18.Position and align rear fold down seat mounting
frame to fittings, fit nut and bolts and tighten to
25 Nm.
19.Lubricate NEW 'O' rings with refrigerant oil, and
fit to pipe unions.
20.Remove plugs, align unions, and tighten to;
High pressure pipe:
14 Nm
Low pressure pipe:22 Nm.
CAUTION: Use 2 spanners when loosening
or tightening air conditioning pipe unions.
21.Fit LH rear mud flap.
See CHASSIS AND
BODY, Repair, mud flap - rear - lh; Refit
22.Fit evaporator to alpine light duct.See
evaporator to alpine light duct; Refit
23.Evacuate and recharge air conditioning system.
See Adjustment, refrigerant recovery
recycling recharging

ELECTRICAL
1
DESCRIPTION AND OPERATION ELECTRICAL EQUIPMENT
DESCRIPTION
The electrical system is Negative ground, and it is
most important to ensure correct polarity of the
electrical connections at all times. Any incorrect
connections made when reconnecting cables may
cause irreparable damage to the semi-conductor
devices used in the generator and regulator. Incorrect
polarity would also seriously damage any
transistorized equipment such as radio and
tachometer etc.
WARNING: During battery removal or
before carrying out any repairs or
maintenance to electrical components
always disconnect the battery negative lead first.
If the positive lead is disconnected with the
negative lead in place, accidental contact of the
wrench to any grounded metal part could cause a
severe spark, possibly resulting in personal
injury. Upon installation of the battery the positive
lead should be connected first.
GENERATOR
The generator is a three phase, field sensed unit. The
rotor and stator windings produce three phase
alternating current, AC, which is rectified to direct
current, DC. The electronic voltage regulator unit
controls the generator output voltage by high
frequency switching of the rotor field circuit. Use only
the correct Vehicle replacement fan belt. Occasionally
check that the engine and generator pulleys are
accurately aligned.
It is essential that good electrical connections are
maintained at all times. Of particular importance are
those in the charging circuit (including those at the
battery) which should be occasionally inspected to
see that they are clean and tight. In this way any
significant increase in circuit resistance can be
prevented.Do not disconnect battery cables while the engine is
running or damage to the semi-conductor devices
may occur. It is also inadvisable to break or make any
connections in the generator charging and control
circuits while the engine is running.
The electronic voltage regulator employs micro-circuit
techniques resulting in improved performance under
difficult service conditions. The whole assembly is
encapsulated in silicone rubber and housed in an
aluminium heat sink, ensuring complete protection
against the adverse effects of temperature, dust, and
moisture etc.
The regulating voltage is set during manufacture to
give the required regulating voltage range of 14.2±
0.2 volts, and no adjustment is necessary. The only
maintenance needed is the occasional check on
terminal connections and wiping with a clean dry
cloth.
The generator system provides for direct connection
of a charge (ignition) indicator warning light, and
eliminates the need for a field switching relay or
warning light control unit. As the warning lamp is
connected in the charging circuit, lamp failure will
cause loss of charge. Lamp should be checked
regularly and spare carried.
When using rapid charge equipment to re-charge the
battery, the battery must be disconnected from the
vehicle.
NOTE: For description and operation of
electrical circuits see separate publication:
Electrical Troubleshooting Manual.

ELECTRICAL
1
FAULT DIAGNOSIS GENERAL INFORMATION
The electrical fault diagnostic tool on Discovery
vehicles is Testbook. Detailed information of electrical
systems, component locations and circuit diagrams
are covered in the Discovery Electrical
Troubleshooting Manual.
See INTRODUCTION,
Information, Fault Diagnostic Equipment
This section covers checks of the charging and
ignition system.
GENERATOR TESTING
Service repair no - 86.10.01
Charging system check
1.Check battery is in good condition, with an open
circuit voltage of at least 12.6 V. Recharge or
substitute battery to carry out test.
2.Check drive belt condition.
See SECTION 10,
Maintenance, Under Bonnet [Hood]
Maintenance
3.Check battery connections are clean and tight.
4.Check generator connections are clean and
tight.
5.Ensure there is no drain on battery from, for
example, interior, under bonnet [hood] or door
edge lamps.
Generator test
Following instructions refer to use of suitable test
equipment using a carbon pile rheostat.
6.Connect test equipment referring to
manufacturer's instructions.
7.Start engine and run at 3000 rev/min without
accessory load.
8.Rotate carbon pile load control to achieve
greatest output (amps) without allowing voltage
to fall below 12.0 V. A reading in amps, of
generator output, minus 10% to allow for EFI
and Ignition loss, should be obtained.
9.Run engine at 3000 rev/min, switch selector to
regulator test, read voltmeter. A reading of 13.6
to 14.4 V should be obtained.
10.Switch selector to diode/stator test, switch on
headlamps to load generator. Raise engine
speed to 3000 rev/min, read voltmeter, needle
must be within 'OK' range.TESTING IN POSITION
Charging circuit resistance test.
1.Connect a low range voltmeter between
generator terminal marked B+ and positive
terminal of battery.2.Switch on headlamps, start engine. Run engine
at approximately 3000 rev/min. Note voltmeter
reading.
3.Transfer voltmeter connections to frame of
generator and negative terminal of battery, and
again note voltmeter reading.
4.If reading exceeds 0.5 volt on positive side or
0.25 volt on negative side, there is a high
resistance in charging circuit which must be
traced and remedied.