air condition LAND ROVER DEFENDER 1996 Manual Online

82AIR CONDITIONING
14
REPAIR Refit
19.Coat unions, threads and new 'O' rings with
refrigerant oil prior to reassembly.
20.Position heater/cooler unit in engine
compartment and locate with air duct seal.
21.Secure unit top and bottom mounting brackets to
bulkhead and support bracket to front of unit
casing. Fully tighten fixing bolts when unit is
correctly positioned.
22.If applicable, fit blower motor resistor block to
vehicle wing.
23.Connect blower motor wiring plugs.
24.Fit footwell insulation and carpet.
25.Fit control cable to evaporator flap operating rod
using new clip. Secure outer cable.
26.Connect water valve vacuum switch pipe and
thermostat leads.
27.Fit air control flap solenoid to side of
heater/cooler unit.
28.Reconnect heater matrix hoses.
29.Connect high pressure pipe to evaporator.
30.Connect low pressure pipe and fit insulation
cover.
31.Evacuate and recharge air conditioning system
See Adjustment, Refrigerant recovery,
recycling, recharging.
32.Reconnect battery.

AIR CONDITIONING
15
REPAIR EVAPORATOR - RH DRIVE
Service repair no - 82.25.20
Remove
1.Remove heater/cooler unit
See Heater/cooler
unit - RH drive.
2.Suitably support unit on a bench.
3.Remove sealant and release thermostat probe
from low pressure pipe.
4.Remove 2 screws securing blower motor cover
to main casing.
5.Withdraw cover sufficiently to release motor
Lucar connector and earth eyelet. Remove
cover.
6.Unscrew top adaptor pipe from heater matrix.
7.Remove 18 fixings securing top cover to main
casing and heater/cooler support frame.
8.Carefully break sealing compound around edge
of joint seam and remove top cover from main
casing.
9.Lift out heater matrix.
10.Remove 2 screws securing back of evaporator
to support frame.
11.From underneath, remove 2 nuts and washers
securing evaporator matrix to base of casing.
12.Lift evaporator matrix from casing, complete with
side plates.
13.Remove side plates
14.Clean sealing compound from all joint seams of
main casing and top cover.
NOTE: The evaporator matrix is supplied
complete with the expansion valve.
However, a faulty expansion valve can be
serviced separately,
See Expansion valve - RH
drive.
Refit
15.Locate side panels to new evaporator lower
fixing studs.
16.Fit evaporator, with side plates, into main casing.
Ensure both studs are located through bottom of
casing and secure.
17.Apply sealing compound around joint seam of
main casing.
18.Fit top cover to main casing.
19.Fit thermostat probe to to low pressure pipe and
apply sealant.
20.Fit top adaptor pipe to heater matrix.
21.Fit Lucar connector and eath eyelet to blower
motor.
22.Fit blower motor cover.
23.Fit heater/cooler unit assembly into engine
compartment
See Heater/cooler unit.

82AIR CONDITIONING
16
REPAIR EXPANSION VALVE - RH DRIVE
Service repair no - 82.25.01
Remove
1.Remove evaporator
See Evaporator - RH
drive.
2.Unscrew union securing pressure sensor to low
pressure pipe.
3.Release spring clip securing temperature sensor
to low pressure pipe.
4.Unscrew union and remove expansion valve
from evaporator high pressure pipe.
5.Remove high pressure pipe from expansion
valve.
6.Discard all pipe connection 'O' rings.
Refit
7.Coat unions, threads and new 'O' rings with
refrigerant oil prior to reassembly.
8.Fit high presssure pipe to new expansion valve.
9.Fit expansion valve to evaporator high pressure
pipe.
10.Secure temperature and pressure sensors to low
pressure pipe.
11.Fit evaporator
See Evaporator - RH drive.

AIR CONDITIONING
17
REPAIR HEATER MATRIX - RH DRIVE
Service repair no - 82.25.19
Remove
1.Remove heater/cooler unit
See Heater/cooler
unit - RH drive.
2.Suitably support unit on a bench.
3.Remove sealant and release thermostat probe
from low pressure pipe.
4.Remove 2 screws securing blower motor cover
to main casing.
5.Withdraw cover sufficiently to release motor
Lucar connector and earth eyelet. Remove
cover.
6.Unscrew top adaptor pipe from heater matrix.
7.Remove 18 fixings securing top cover to main
casing and heater/cooler support frame.
8.Carefully break sealing compound around edge
of joint seam and remove top cover from main
casing.
9.Lift out heater matrix.
10.Clean sealing compound from all joint seams of
main casing and top cover.
Refit
11.Locate heater matrix in main casing.
12.Apply sealing compound around joint seam of
main casing.
13.Fit top cover to main casing.
14.Fit adaptor pipe to heater matrix.
15.Fit thermostat probe to to low pressure pipe and
apply sealant.
16.Fit Lucar connector and eath eyelet to blower
motor.
17.Fit blower motor cover.
18.Fit heater/cooler unit assembly into engine
compartment
See Heater/cooler unit.

82AIR CONDITIONING
18
REPAIR RESISTOR, BLOWER MOTOR - LH DRIVE
Service repair no - 82.20.26
Remove
1.Remove multi-plug from resistor.
2.Remove blower motor relay from connecting
block to gain access to fixing screw.
3.Remove screw and release relay connector
block. Retain relay in connector block.
4.Remove screw and detach air conditioning 30
amp fuse bracket from resistor.
5.Lift resistor unit from top cover.
Refit
6.Locate resistor unit in top cover.
7.Fit fuse bracket.
8.Fit blower motor relay connector block and relay.
9.Fit resistor multi-plug.RESISTOR, BLOWER MOTOR - RH DRIVE
Service repair no - 82.20.26
Remove
1.Remove multi-plugs from resistor.
2.Remove 2 screws securing resistor to wing
mounted block.
3.Withdraw resistor unit.
Refit
4.Secure resistor to mounting block.
5.Fit resistor multi-plugs.

WIPERS AND WASHERS
3
REPAIR WIPER MOTOR AND DRIVE RACK - VEHICLE
WITH AIR CONDITIONING, LH DRIVE
Service repair no - 84.15.20
Remove
1.Disconnect battery.
2.Remove wiper arms.
3.Remove single screw and remove fascia side
panel.
4.Remove 5 screws and withdraw instrument
panel as far as possible without straining wires
and cables.
5.Remove steering wheel
See STEERING,
Repair, Steering wheel.
6.Remove 2 screws at RH side and single screw
at LH side, inside instrument cowel, and
withdraw air conditioning panel and controls.
7.Release fascia panel LH support bracket.
8.Remove wiper motor cover finisher.

84WIPERS AND WASHERS
4
REPAIR
9.Remove door check strap cover and 3 screws
and withdraw wiper motor cover. If applicable,
disconnect switch multi-plugs and/or radio
speaker leads.
10.Disconnect wiper motor multi-plug.
11.Disconnect earth lead. (Not applicable on later
models)
12.Lift rubber sleeve from wiper motor and slacken
wiper motor to drive tube nut.
13.Remove 2 screws and release wiper motor
retaining strap, complete with mounting pad and
earth tag.
14.Pull wiper motor and drive rack clear of drive
tubes.Refit
15.Feed drive rack into drive tube until fully located
in wheel boxes.
16.Finger tighten drive tube nut.
17.Position motor mounting pad, fit retaining strap,
including earth tag and secure wiper motor
assembly.
18.Fully tighten drive tube nut and fit rubber sleeve.
19.Fit wiper motor multi-plug and earth lead to tag
on motor retaining strap.
20.Before fitting fascia panels, fit wiper blades,
reconnect battery and test wiper operation.
21.Refit fascia panels, noting that air conditioning
panel must be located and secured, on LH side,
with single screw, before instrument panel is
fitted.
22.Fit steering wheel
See STEERING, Repair,
Steering wheel.

84WIPERS AND WASHERS
6
REPAIR WINDSCREEN WIPER WHEEL BOXES - NON AIR
CONDITIONED VEHICLES
Service repair no - 84.15.25
Remove
1.Disconnect battery.
2.Remove wiper arms
See Windscreen wiper
arms.
3.Remove wiper motorSee Wiper motor and
drive rack - vehicle with air conditioning, LH
drive
.
4.Remove instrument housing, fascia crash pad,
and ventilator grille panel.
5.Slacken steering column support rod lower
fixing.6.Remove steering column upper support fixing.
7.Slacken nuts to release back plates from LH and
RH wheel boxes.
8.Remove drive rack tubes.
9.Slacken grub screws and remove wiper arm
adaptors.
10.Remove LH and RH wheelbox spindle nuts.
11.Remove wheel box assemblies from vehicle.

84WIPERS AND WASHERS
8
REPAIR WINDSCREEN WIPER WHEELBOXES - AIR
CONDITIONED VEHICLES
Service repair no - 84.15.25/20
Remove
1.Disconnect battery.
2.Remove wiper motor and drive rack
See Wiper
motor and drive rack - air conditioned
vehicles.
3.Remove centre and LH fascia top crash rail
support bracket fixings.
4.Remove both demister vents from ducts.
5.Remove RH demister vent hose from duct.
6.Remove RH vent demister vent fixing and pivot
vent and hose aside.
7.Remove demister vent top duct.8.Release steering column upper and lower
support rods.
9.Slacken LH and RH wheelbox nuts and remove
drive tubes from wheelboxes.
10.Remove wiper arm splined adaptor.
11.Remove spacer, where fitted, early vehicles
only.
12.Remove nuts securing left and RH wheel boxes
and withdraw wheelboxes from bulkhead.
NOTE: During assembly all fixings related
to wiper motor and wheelboxes are finger
tightened only until all components are
correctly aligned.

ELECTRICAL
1
DESCRIPTION AND OPERATION ELECTRICAL EQUIPMENT
Description
The electrical system is Negative ground, and it is
most important to ensure correct polarity of electrical
connections at all times. Any incorrect connections
made when reconnecting cables may cause
irreparable damage to semi-conductor devices used in
generator and regulator. Incorrect polarity would also
seriously damage any transistorized equipment such
as a radio.
WARNING: During battery removal or
before carrying out any repairs or
maintenance to electrical components
always disconnect battery negative lead first. If
positive lead is disconnected with negative lead in
place, accidental contact of wrench to any
grounded metal part could cause a severe spark,
possibly resulting in personal injury. Upon
installation of battery 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 generator output voltage by high frequency
switching of the rotor field circuit. Use only correct
replacement drive belt. Occasionally check that
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
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 engine is
running or damage to semi-conductor devices may
occur. It is also inadvisable to break or make any
connections in the generator charging and control
circuits while 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 adverse effects of temperature, dust, and
moisture etc.
The regulating voltage is set during manufacture to
give required regulating voltage range of 14.2±0.2
volts, and no adjustment is necessary. The only
maintenance needed is 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 lamp, and
eliminates the need for a field switching relay or
warning light control unit. In the event of bulb failure,
an 'exciter' voltage is supplied through a resistor,
wired in parallel to the bulbs, ensuring that generator
output is maintained. The lamp should be checked
regularly.
When using rapid charge equipment to re-charge
battery, the battery must be disconnected from the
vehicle.