Range Rover Classic. Manual — part 170
82
AIR CONDITIONING
6
ADJUSTMENT
SYSTEM TEST
1. Place the vehicle in a ventilated, shaded area
free from excessive draught, with the doors and
windows open.
2. Check that the surface of the condenser is not
restricted with dirt, leaves, flies, etc. Do not
neglect to check the surface between the
condenser and the radiator. Clean as necessary.
3. Switch on the ignition and the air conditioner air
flow control. Check that the blower is operating
efficiently at low, medium and high speeds.
Switch off the blower and the ignition.
4. Check that the evaporator condensate drain
tubes are open and clear.
5. Check the tension of the compressor driving belt,
and adjust if necessary.
6. Inspect all connections for the presence of
refrigerant oil. If oil is evident, check for leaks,
and repair as necessary.
NOTE: The compressor oil is soluble in
Refrigerant R134a and is deposited when
the refrigerant evaporates from a leak.
7. Start the engine.
8. Set the temperature controls to cold and switch
the air conditioner blower control on and off
several times, checking that the magnetic clutch
on the compressor engages and releases each
time.
9. With the temperature control at maximum
cooling and the blower control at high speed,
warm up the engine and fast idle at 1000
rev/min. Check the sight glass for bubbles or
foam. The sight glass should be generally clear
after five minutes running, occasional bubbles
being acceptable. Continuous bubbles may
appear in a serviceable system on a cool day, or
if there is insufficient air flow over the condenser
at a high ambient temperature.
10. Repeat at 1800 rev/min.
11. Gradually increase the engine speed to the high
range, and check the sight glass at intervals.
12. Check for frosting on the service valves.
13. Check the high pressure hoses and connections
by hand for varying temperature. Low
temperature indicates a restriction or blockage at
that point.
14. Switch off the air conditioning blower and stop
the engine.
15. If the air conditioning equipment is still not
satisfactory, carry out a pressure test as
previously described in this section.
COMPRESSOR DRIVE BELT
Service repair no - 82.10.01
See ENGINE, Repair, Drive Belt -Tdi
See ENGINE, Repair, Compressor Drive Belt - V8i
AIR CONDITIONING
1
REPAIR
PRECAUTIONS IN HANDLING REFRIGERANT
LINES
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
1. When disconnecting any hose or pipe
connection the system must be discharged of all
pressure. Proceed cautiously, regardless of
gauge readings. Open connections slowly,
keeping hands and face well clear, so that no
injury occurs if there is liquid in the line. If
pressure is noticed, allow it to bleed off slowly.
2. Lines, flexible end connections and components
must be capped immediately they are opened to
prevent the entrance of moisture and dirt.
3. Any dirt or grease on fittings must be wiped off
with a clean alcohol dampened cloth. Do not use
chlorinated solvents such as trichloroethylene. If
dirt, grease or moisture cannot be removed from
inside the hoses, they must be replaced with
new hoses.
4. All replacement components and flexible end
connections must be sealed, and only opened
immediately prior to making the connection.
5. Ensure the components are at room temperature
before uncapping, to prevent condensation of
moisture from the air that enters.
6. Components must not remain uncapped for
longer than fifteen minutes. In the event of delay,
the caps must be fitted.
7. Receiver/driers must never be left uncapped as
they contain Silica Gel crystals which will absorb
moisture from the atmosphere. A receiver/ drier
left uncapped must not be used, fit a new unit.
8. The compressor shaft must not be rotated until
the system is entirely assembled and contains a
charge of refrigerant.
9. A new compressor contains an initial charge of
of refrigerant oil. The compressor also contains a
holding charge of gas when received which
should be retained by leaving the seals in place
until the pipes are re-connected.
10. The receiver/drier should be the last component
connected to the system to ensure optimum
dehydration and maximum moisture protection of
the system.
11. All precautions must be taken to prevent
damage to fittings and connections. Slight
damage could cause a leak with th high
pressures used in the system.
12. Always use two wrenches of the correct size,
one on each fitting when releasing and
tightening refrigeration unions.
13. Joints and ’O’ rings should be coated with
refrigeration oil to aid correct seating. Fittings
which are not lubricated with refrigerant oil are
almost certain to leak.
14. All lines must be free of kinks. The efficiency of
the system is reduced by a single kink or
restriction.
15. Flexible hoses should not be bent to a radius
less than 90mm.
16. Flexible hoses should not be within 100mm of
the exhaust manifold.
17. Completed assemblies must be checked for
refrigeration lines touching metal panels. Any
direct contact of lines and panels transmits noise
and must be eliminated.
82
AIR CONDITIONING
2
REPAIR
PERIODIC MAINTENANCE
Routine servicing, apart from visual checks, is not
necessary. The visual inspections are as follows:
Condenser
With a water hose or air line, clean the fins of the
condenser to remove flies, leaves, etc. Check the pipe
connections for signs of oil leakage.
Compressor
Check pipe connections for signs of oil leakage.
Check flexible hoses for swelling. Examine the
compressor belt for tightness and condition.
Sight glass and Receiver/Drier
Examine the sight glass for bubbles with the system
operating. Check connections for leakage.
Evaporator
Examine the refrigeration connections at the unit. If
the system should develop a fault, or if erratic
operation is noticed.
See Fault diagnosis,
Refrigeration System Faults
RECEIVER DRIER
Service repair no - 82.17.01
Remove
CAUTION: If receiver/drier is to be refitted,
the ports must be blanked off immediately
on disconnection. Exposed life of unit is
only 15 minutes.
1. Disconnect battery negative lead.
2. 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.
3. Release 4 clips from brackets on bonnet locking
platform and remove radiator grille.
AIR CONDITIONING
3
REPAIR
Automatic gearbox
4. Remove 4 bolts securing transmission oil cooler
to body.
5. Disconnect 2 pipe unions from oil cooler. Use a
second spanner to support hose adapter.
6. Remove transmission oil cooler. Seal
connections.
All models
7. Remove bolt securing receiver/drier clamp.
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
8. Move receiver/drier just sufficiently to gain
access to pipe flange bolts without distorting the
pipes.
9. Remove bolt securing each pipe flange to
receiver/drier.
10. Disengage pipe flanges and withdraw
receiver/drier from mounting bracket.
11. Remove ’O’ ring from each pipe flange.
Refit
12. Fit new ’O’ ring to each pipe flange, lubricate
with refrigerant oil.
13. Position receiver/drier in mounting bracket with
inlet and outlet connections correctly aligned.
14. Engage pipe flanges, fit bolts in turn and tighten.
15. Fit clamp bolt.
Automatic gearbox
16. Refit transmission oil cooler. Use a second
spanner to support pipe unions.
17. Check gearbox fluid level, top-up if necessary.
All models
18. Evacuate and recharge air conditioning system.
See Adjustment, Refrigerant Recovery
Recycling Recharging
19. Perform a leak test on disturbed joints.
20. Carry out a functional check.
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