Defender 90 NAS. Manual — part 93
AIR CONDITIONING
11
REPAIR
13. Remove screw securing mounting bracket flange
to casing.
14. Remove screws securing each end of blower
flanges to upper casing.
15. Remove 6 screws securing upper to lower
casing.
16. Remove tape sealing air duct inside casing.
17. Release tape sealing pipes to casing.
18. Cut through sealant along casing joint and
gaskets.
19. Ease upper from lower casing and remove upper
casing.
20. Lift evaporator unit from lower casing.
Do not
carry out further dismantling if component is
removed for access only.
21. Using a backing spanner, loosen union nut from
pipe and remove high pressure pipe. Discard ’O’
ring.
22. Loosen clip and withdraw capillary tube coil from
low pressure pipe and withdraw coil from pipe.
23. Loosen capillary tube union nut and disconnect
from low pressure pipe.Discard ’O’ ring.
24. Using a backing spanner, loosen union nut and
remove expansion valve from pipe. Discard ’O’
ring.
Refit
25. Lubricate NEW ’O’ rings with refrigerant oil and
fit to pipe ends.
26. Fit expansion valve to pipe, DO NOT tighten
union nut.
27. Connect capillary tube and tighten union nut.
28. Position capillary tube coil on low pressure pipe
and secure with clip.
29. Wrap capillary coil and union with prestite tape.
30. Connect high pressure pipe to expansion valve,
carefully align with low pressure pipe and tighten
union nut.
31. Tighten expansion valve union nut.
32. Position evaporator unit in lower casing, align
bracket and engage blower flange screws, DO
NOT tighten.
33. Position upper casing, engage lower casing
flange and secure with screws. Ensure mounting
bracket screw engages evaporator bracket.
34. Tighten blower flange screws.
35. Apply Silicone sealant to casing joint and
insulating tape to seal pipes to casing.
36. Apply sealing tape around air duct joint.
37. Position evaporator unit in footwell.
38. Connect multiplugs to compressor relays and
secure harness ’P’ clip.
39. Connect Lucars (G, U, and R) to resistor unit
and (B) to motor.
40. Lift evaporator, insert pipes into aperture and
engage mounting studs.
41. Connect drain tube to pipe.
42. Fit grommet into aperture.
43. Lubricate NEW ’O’ rings with refrigerant oil and
fit to
44. Carry out a functional check. joints.
45. Using a backing spanner, engage high pressure
pipe and tighten union nut.
46. Using a backing spanner, engage low pressure
pipe and tighten union nut.
47. Fit nuts and secure evaporator casing to
mounting bracket.
48. Fit fascia duct bezel.
See fascia duct bezel
49. Evacuate and recharge air conditioning system.
See Adjustment, refrigerant recovery
recycling recharging
50. Reconnect battery negative lead.
51. Perform leak test on disturbed joints
52. Carry out system test.
See Adjustment,
System test
82
AIR CONDITIONING
12
REPAIR
WIRING HARNESS - SUPPLEMENTARY
Service repair no - 86.70.23
Remove
1. Remove evaporator.
See evaporator
2. Remove nut and release earth eyelet from
fender.
3. Disconnect multiplug from compressor fly-lead.
4. Remove 4 ties securing harness to air
conditioning hoses.
5. Remove tie securing harness to engine harness.
6. Above chassis front crossmember, disconnect
multiplug from condenser fan fly-lead.
7. Disconnect multiplug from trinary switch.
8. Release ties securing harness to pipes.
9. Remove 4 screws securing fusebox cover to
centre console.
10. Remove cover.
11. Disconnect multiplug from main harness.
12. Remove screw securing earth eyelet to fusebox
bracket.
13. Pull harness from between centre console and
bulkhead.
14. Remove grommet from harness.
15. Remove ’P’ clip from harness.
16. Extract harness from front of engine
compartment and pass through bulkhead into
footwell area. Remove air conditioning harness.
AIR CONDITIONING
13
REPAIR
Refit
17. Position harness in footwell and route harness
into engine bay, follow evaporator and receiver
drier hoses to receiver drier.
18. Fit grommet and ’P’ clip to harness.
19. Position harness between centre console and
bulkhead with multiplugs in fusebox area.
20. Secure earth eyelet to fusebox bracket.
21. Connect multiplugs to main harness.
22. Position switch harness to RH side of console, fit
fusebox cover and secure with screws.
23. Connect multiplug to trinary switch and
condenser fan fly-lead.
24. Secure earth eyelet to fender.
25. Connect multiplug to compressor fly-lead.
26. Secure harness to air conditioning hoses with
ties.
27. Secure harness to engine harness with tie.
28. Fit evaporator.
See evaporator
29. Perform leak test on disturbed joints
30. Carry out system test.
See Adjustment,
System test
AIR CONDITIONING
1
SPECIFICATIONS, TORQUE
TORQUE VALUES
Air conditioning
Nm
lbf ft
Compressor to mounting bracket
25
. . . . . . . . . .
18
Compressor pipe flange bolts
10
. . . . . . . . . . ..
7
Receiver drier union bolts
6
. . . . . . . . . . . .
4.5
Trinary pressure switch
11
. . . . . . . . . . . . .
8
Pressure pipe union nuts - M16
14
. . . . . . . . . ...
10
Discharge pipe union nuts - M22
22
. . . . . . . . . .
16
Suction pipe union nuts - M24
33
. . . . . . . . . . ..
24
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