Defender 300Tdi (1996+). Manual — part 98
AIR CONDITIONING
15
REPAIR
EVAPORATOR - RH DRIVE
Service repair no - 82.25.20
Remove
1. Remove heater/cooler unit
See Heater/cooler
unit - RH drive.
2. Suitably support unit on a bench.
3. Remove sealant and release thermostat probe
from low pressure pipe.
4. Remove 2 screws securing blower motor cover
to main casing.
5. Withdraw cover sufficiently to release motor
Lucar connector and earth eyelet. Remove
cover.
6. Unscrew top adaptor pipe from heater matrix.
7. Remove 18 fixings securing top cover to main
casing and heater/cooler support frame.
8. Carefully break sealing compound around edge
of joint seam and remove top cover from main
casing.
9. Lift out heater matrix.
10. Remove 2 screws securing back of evaporator
to support frame.
11. From underneath, remove 2 nuts and washers
securing evaporator matrix to base of casing.
12. Lift evaporator matrix from casing, complete with
side plates.
13. Remove side plates
14. Clean sealing compound from all joint seams of
main casing and top cover.
NOTE: The evaporator matrix is supplied
complete with the expansion valve.
However, a faulty expansion valve can be
serviced separately,
See Expansion valve - RH
drive.
Refit
15. Locate side panels to new evaporator lower
fixing studs.
16. Fit evaporator, with side plates, into main casing.
Ensure both studs are located through bottom of
casing and secure.
17. Apply sealing compound around joint seam of
main casing.
18. Fit top cover to main casing.
19. Fit thermostat probe to to low pressure pipe and
apply sealant.
20. Fit top adaptor pipe to heater matrix.
21. Fit Lucar connector and eath eyelet to blower
motor.
22. Fit blower motor cover.
23. Fit heater/cooler unit assembly into engine
compartment
See Heater/cooler unit.
82
AIR CONDITIONING
16
REPAIR
EXPANSION VALVE - RH DRIVE
Service repair no - 82.25.01
Remove
1. Remove evaporator
See Evaporator - RH
drive.
2. Unscrew union securing pressure sensor to low
pressure pipe.
3. Release spring clip securing temperature sensor
to low pressure pipe.
4. Unscrew union and remove expansion valve
from evaporator high pressure pipe.
5. Remove high pressure pipe from expansion
valve.
6. Discard all pipe connection ’O’ rings.
Refit
7. Coat unions, threads and new ’O’ rings with
refrigerant oil prior to reassembly.
8. Fit high presssure pipe to new expansion valve.
9. Fit expansion valve to evaporator high pressure
pipe.
10. Secure temperature and pressure sensors to low
pressure pipe.
11. Fit evaporator
See Evaporator - RH drive.
AIR CONDITIONING
17
REPAIR
HEATER MATRIX - RH DRIVE
Service repair no - 82.25.19
Remove
1. Remove heater/cooler unit
See Heater/cooler
unit - RH drive.
2. Suitably support unit on a bench.
3. Remove sealant and release thermostat probe
from low pressure pipe.
4. Remove 2 screws securing blower motor cover
to main casing.
5. Withdraw cover sufficiently to release motor
Lucar connector and earth eyelet. Remove
cover.
6. Unscrew top adaptor pipe from heater matrix.
7. Remove 18 fixings securing top cover to main
casing and heater/cooler support frame.
8. Carefully break sealing compound around edge
of joint seam and remove top cover from main
casing.
9. Lift out heater matrix.
10. Clean sealing compound from all joint seams of
main casing and top cover.
Refit
11. Locate heater matrix in main casing.
12. Apply sealing compound around joint seam of
main casing.
13. Fit top cover to main casing.
14. Fit adaptor pipe to heater matrix.
15. Fit thermostat probe to to low pressure pipe and
apply sealant.
16. Fit Lucar connector and eath eyelet to blower
motor.
17. Fit blower motor cover.
18. Fit heater/cooler unit assembly into engine
compartment
See Heater/cooler unit.
82
AIR CONDITIONING
18
REPAIR
RESISTOR, BLOWER MOTOR - LH DRIVE
Service repair no - 82.20.26
Remove
1. Remove multi-plug from resistor.
2. Remove blower motor relay from connecting
block to gain access to fixing screw.
3. Remove screw and release relay connector
block. Retain relay in connector block.
4. Remove screw and detach air conditioning 30
amp fuse bracket from resistor.
5. Lift resistor unit from top cover.
Refit
6. Locate resistor unit in top cover.
7. Fit fuse bracket.
8. Fit blower motor relay connector block and relay.
9. Fit resistor multi-plug.
RESISTOR, BLOWER MOTOR - RH DRIVE
Service repair no - 82.20.26
Remove
1. Remove multi-plugs from resistor.
2. Remove 2 screws securing resistor to wing
mounted block.
3. Withdraw resistor unit.
Refit
4. Secure resistor to mounting block.
5. Fit resistor multi-plugs.
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