Defender (1993+). Manual - part 92
AIR
CONDITIONING
(h) The compressor shaft must not be rotated
Evaporator
until the system is entirely assembled and
contains a charge of refrigerant.
Examine the refrigeration connections at the unit.
If
( j ) A new compressor contains an initial charge
of
the system should develop a fault, or
if
erratic
312,5 ml (11 UK fluid ozs) of oil when
operation is noticed, refer to the fault diagnosis
received, part
of
which
is
distributed
chart.
throughout the system when
it
has been run.
The compressor contains a holding charge of
gas when received which should be retained
until the hoses are connected.
component connected to the system to ensure
optimum dehydration and maximum moisture
protection of the system.
(I)
All
precautions must be taken to prevent
damage
to
fittings and connections. Slight
Stem type Service valves allow for the isolation
of
damage could cause a leak with the high
the compressor from other parts
of
the system,
pressures used in the system.
When these valves are used in conjunction with the
(m) Always use
two
spanners
of
the correct size,
liquid line quick-disconnect fittings, the three major
one on each hexagon, when releasing and
assemblies
of
the system can be removed from the
tightening refrigeration unions.
vehicle with a minimal
loss
of
refrigerant. In addition,
(n) Joints and ' O ' rings should be coated with
it
is
possible to remove major assemblies for repair
refrigeration oil to aid correct seating. Fittings
of
components which are not part of the refrigeration
which are not lubricated with refrigerant oil are
system,
or
provide access
to
parts
of
the vehicle
almost certain to leak.
which are obstructed by the air conditioning system,
(o) All lines must be
free of
kinks. The efficiency
without fully discharging the system. A thorough
of the system is reduced by a single kink
or
understanding
of
the stem type service valve is
restriction.
necessary before undertaking servicing
or
repair
(p) Flexible hoses should not
be
bent
to
a radius
less than ten times the diameter
of
the hoses.
(q) Flexible connections should not
be
within 50
mm
of
the exhaust manifold.
(r) Completed assemblies must be checked tor
refrigeration lines touching sheet metal panels.
Any direct contact
of
lines and
sheet
transmits
noise and must be eliminated.
Service valves
There are
two
types of service valves in operation:
(k) The
receiver/drier
should be the last
'Stem' and 'Schrader'. To identify where the different
operations occur, stem type will be boxed.
Stem type
involving
the
air conditioning system.
PERIODIC MAINTENANCE
Routine servicing apart from visual checks, is not
necessary. The visual inspections are as follows:
Condenser
1
servlce port
With
a
hose pipe or air line.
clean
the
face of
the
2. Valve stem
condenser
to
remove flies. leaves etc. Check the
3 . Compressor
port
pipe connections
for
signs
of
oil leakage.
4.
Valve
seat
Compressor
5.
Hose connector
Check hose connections
for
signs of oil leakage.
Check flexible
hoses
for swelling. Examine the
compressor belt
for
tightness and condition.
Checking the compressor oil level and topping-up is
only necessary after charging the system
or
in the
event
of
a malfunction
of
the system.
Receiver/Drier
Stem type service valve
Examine the sight glass
for
bubbles with the system
operating. Check connections
for
leakage.
2
RE-ISSUED: FEB
1993