Defender 90 NAS. Manual — part 91
AIR CONDITIONING
3
REPAIR
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
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.
3. Clean area around receiver drier connections.
4. Disconnect multiplug from trinary switch.
5. Remove trinary switch from receiver drier.
CAUTION: Plug the connections.
6. Disconnect 2 pipe unions from receiver drier.
7. Remove and discard ’O’ rings from pipe flanges.
8. Fully loosen clip securing receiver drier to
bracket.
9. Remove receiver drier from clip.
Refit
10. Fit NEW ’O’ ring to each pipe flange, lubricate
with refrigerant oil.
11. Add 20ml, 0.7 fl oz of refrigerant oil to NEW
receiver drier.
12. Position receiver drier in clip, tighten clip but do
not clamp.
13. Engage pipes and tighten unions to
6 Nm, 4.5
lbf ft .
14. Fit trinary switch to receiver drier and tighten to
11Nm, 8 lbf ft.
15. Connect multiplug to trinary switch.
16. Tighten receiver drier clamp.
17. Evacuate and recharge air conditioning system.
See Adjustment, refrigerant recovery
recycling recharging
18. Perform a leak test on disturbed joints.
19. Carry out system test.
See Adjustment,
System test
82
AIR CONDITIONING
4
REPAIR
TRINARY PRESSURE SWITCH
Service repair no - 82.20.04
Remove
1. Disconnect battery negative lead.
2. Recover refrigerant from system.
See
Adjustment, refrigerant recovery, recycling,
recharging
3. Access below front RH of vehicle: Disconnect
multiplug from switch.
4. Remove switch from adaptor.
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant.
5. Remove ’O’ ring from switch and discard.
Refit
6. Lubricate NEW ’O’ ring with refrigerant oil and fit
to switch.
7. Fit switch to adaptor and tighten to
11 Nm, 8 lbf
ft.
8. Connect multiplug.
9. Evacuate and recharge air conditioning system.
See Adjustment, Refrigerant recovery,
recycling, recharging
10. Reconnect battery negative lead.
11. Carry out system test.
See Adjustment,
System test
RELAY - FAN INTERLOCK
Service repair no - 82.20.08
Remove
1. Lever under each bottom corner and extract cold
air vents from bezel, 1 from LH side and 2 from
RH side.
2. Remove screw securing underside of bezel to
panel
3. Remove 3 screws securing inside of bezel to
panel
AIR CONDITIONING
5
REPAIR
4. Lift bezel away from evaporator casing
5. Withdraw capillary tube from evaporator fins.
6. Disconnect multiplug from fan interlock relay.
7. Remove securing screw and remove relay from
rear of bezel.
Refit
8. Fit screw and secure relay to rear of bezel.
9. Connect multiplug to fan interlock relay.
10. Position bezel assembly and insert capillary tube
60 mm, 2.5 in into evaporator fins.
11. Fit bezel assembly to panel and above
evaporator casing, secure with screws.
12. Fit cold air vents.
13. Carry out system test.
See Adjustment,
System test
RELAY - CONDENSER FAN
Service repair no - 82.20.09
Remove
1. Disconnect multiplug from relay.
NOTE: Connector wiring: B/S, N/P, N/S,
N/W
2. Release securing screw and remove relay from
side of evaporator casing.
Refit
3. Fit screw and secure relay to side of casing.
4. Connect multiplug to relay.
5. Carry out system test.
See Adjustment,
System test
82
AIR CONDITIONING
6
REPAIR
CONTROL SWITCHES
Service repair no - 82.20.10 - Temperature Control
Switch
Service repair no - 82.20.11 - Fan Switch
Remove
1. Remove fascia duct bezel.
See fascia duct
bezel
2. Pull control knobs from switches.
3. Remove switch panel.
4. Remove nut securing switch to bezel.
5. Remove switch.
NOTE: Fan switch to left.
Refit
6. Fit temperature control switch. Position capillary
tube inside duct to RH side.
7. Fit and tighten nut securing switch to bezel.
8. Fit switch panel.
9. Fit control knobs.
10. Fit fascia duct bezel.
See fascia duct bezel;
Refit
11. Carry out system test.
See Adjustment,
System test
RESISTOR UNIT
Service repair no - 82.20.26
Remove
NOTE: Access below evaporator unit.
1. Loosen outer screw securing resistor unit to
clamp.
2. Rotate resistor on motor.
3. Disconnect Lucars from resistor unit.
NOTE: Resistor wires: G, U, R and O
4. Remove screws securing resistor to clamp.
5. Remove resistor unit and clamp.
Refit
6. Position clamp over motor and place resistor,
terminals downward, onto motor.
7. Fit screws and tighten inner screw only.
8. Fit Lucars to resistor unit, in correct sequence.
9. Rotate resistor to fitted position and tighten outer
screw.
10. Carry out system test.
See Adjustment,
System test
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