Land Rover Defender 90 Workshop 2nd Edition Nas Rover Manual

HEATING AND VENTILATION
5
REPAIR HEATER CONTROL CABLE - AIR DISTRIBUTION
Service repair no - 80.10.12
Remove
1.Disconnect battery.
2.Remove steering wheel.
3.Remove steering column nacelle.
4.Remove instrument panel.
See
INSTRUMENTS, Repair, Instrument panel
5.Remove retaining screws and pull off air
distribution and temperature control lever knobs.
6.Remove 3 screws and detach side cover,
complete with control lever assembly.
7.Remove 2 screws securing control lever
assembly to side cover and remove...

80HEATING AND VENTILATION
6
REPAIR CONTROL CABLE AND BLOWER MOTOR SWITCH
Service repair no - 80.10.17 - Control cable
Service repair no - 80.10.22 - Blower motor switch
Remove
1.Disconnect battery.
2.From inside engine compartment, release outer
cable retaining clip at heater unit.
3.Slacken trunnion fixing and release inner cable
from heater unit flap lever.
4.Release 2 retaining clips securing control cables
to engine bulkhead and heater hoses.
5.Remove 4 screws securing instrument panel to
fascia...

AIR CONDITIONING
1
DESCRIPTION AND OPERATION SCHEMATIC LAYOUT OF THE AIR CONDITIONING
SYSTEM
1.Compressor
2.Condenser
3.Receiver/drier
4.Thermostatic expansion valve
5.Evaporator
6.Capillary tube
7.Trinary pressure switch
8.Condenser cooling fan - single only
9.Compressor high pressure relief valve
10.Sight glass - refrigerant
11.Drying agent - receiver/drier
12.Blower motorA1 Ambient air flow through condenser
A2 Recirclatory air flow through fan and evaporator
A3 Cooled air flow to vehicle interior
F1...

82AIR CONDITIONING
2
DESCRIPTION AND OPERATION AIR CONDITIONING SYSTEM OPERATION
The air conditioning system provides the means of
supplying cooled and dehumidified, recirculated air to
the interior of the vehicle. The cooling effect is
obtained by blowing air through the matrix of an
evaporator unit which has a variable temperature
control to provide the conditions required inside the
vehicle. The volume of cooled air supplied is
controlled by a variable speed blower.
A sealed system, charged with...

AIR CONDITIONING
3
DESCRIPTION AND OPERATION 5. Evaporator
As this change of state occurs, a large amount of
latent heat is absorbed. The evaporator is therefore
cooled and as a result heat is extracted from the air
flowing across the evaporator. The air flow is
controlled by the blower fans which can be operated
at various speeds.
To prevent liquid passing through to the compressor,
a capillary tube (6), attached to the outlet pipe of the
evaporator (5) and connected to the thermostatic
expansion valve...

AIR CONDITIONING
1
FAULT DIAGNOSIS REFRIGERATION SYSTEM FAULTS
For any refrigeration system to function properly all
components must be in good working order. The unit
cooling cycle and the relationship between air
discharge temperature and ambient temperature and
the pressures at the compressor can help to
determine proper operation of the system.
The length of any cooling cycle is determined by such
factors as ambient temperature and humidity,
thermostat setting, compressor speed and air leakage
into...

AIR CONDITIONING
1
ADJUSTMENT GENERAL PRECAUTIONS
The refrigerant used in the air conditioning system is
HFC (Hydrofluorocarbon) R134a.
WARNING: R134a is a hazardous liquid
and when handled incorrectly can cause
serious injury. Suitable protective clothing
must be worn when carrying out servicing
operations on the air conditioning system.
WARNING: R134a is odourless and
colourless. Do not handle or discharge in
an enclosed area, or in any area where the
vapour or liquid can come in contact with naked...

82AIR CONDITIONING
2
ADJUSTMENT SERVICING PRECAUTIONS
Care must be taken when handling refrigeration
system components. Units must not be lifted by their
hoses, pipes or capillary lines. Hoses and lines must
not be subjected to any twist or stress. Ensure that
hoses are positioned in their correct run before fully
tightening the couplings, and ensure that all clips and
supports are used. Torque wrenches of the correct
type must be used when tightening refrigerant
connections to the stated value. An...

AIR CONDITIONING
3
ADJUSTMENT REFRIGERANT RECOVERY, RECYCLING,
RECHARGING
Service repair no - 82.30.20/01
WARNING: The air conditioning system is
charged with a high pressure, potentially
toxic refrigerant. Repairs or servicing must
only be carried out by an operator familiar with
both the vehicle system and the charging and
testing equipment.
All operations must be carried out in a
well-ventilated area away from open flame and
heat sources.
Always wear safety goggles and gloves when
opening refrigerant...

82AIR CONDITIONING
4
ADJUSTMENT 4.Operate the refrigerant evacuation system
according to the manufactures instructions.
NOTE: If the vacuum reading is below 700
mm Hg, 28 in Hg after 15 minutes, suspect
a leak in the system. Partially recharge the
system and check for leaks using an electronic
leak tester. Check suction lines first, then run the
compressor for 5 minutes and then check the high
pressure lines.
CAUTION: The system must be Evacuated
immediately before recharging
commences. Delay between...