lock LAND ROVER DISCOVERY 1999 Workshop Manual

HEATING AND VENTILATION
REPAIRS 80-21
Plenum Air Intake
$% 80.15.62
Remove
1.Remove both windscreen side finishers.

+ EXTERIOR FITTINGS, REPAIRS,
Side finisher - windscreen.
2.Remove caps from windscreen wiper arms.
3.Remove nuts securing wiper arms to wiper
linkage.
4.Remove both wiper arms.
5.Remove lock nuts from wiper linkage and
collect washer and rubber spacers.
6.Remove 2 trim clips and centre bolt securing
plenum air intake to body.
7.Remove plenum air intake. Refit
1.Fit plenum air intake.
2.Fit trim clips and centre bolt securing plenum
air intake to body.
3.Fit rubber spacers and washers to wiper
linkage.
4.Fit locknuts to wiper linkage and tighten to 7
Nm (5.2 lbf.ft).
5.Fit wiper arms to wiper linkage.
6.Fit nuts securing wiper arms to wiper linkage
and tighten to 15 Nm (11 lbf.ft).
7.Fit caps to wiper arms.
8.Fit both windscreen side finishers.

+ EXTERIOR FITTINGS, REPAIRS,
Side finisher - windscreen.

HEATING AND VENTILATION
80-30REPAIRS
Pipe - Heater - Return
$% 80.25.12
Remove
1.Drain engine coolant.

+ COOLING SYSTEM - V8,
ADJUSTMENTS, Drain and refill.
2.Release clip securing heater return hose to
heater return pipe and disconnect hose from
pipe.
3.Remove bolt securing heater return pipe to
heater feed pipe.
4.Release clips securing engine harness and
vacuum pipe to heater return pipe.
5.Remove bolt securing heater return pipe to
cylinder head.
6.Release clip securing engine coolant hose to
heater return pipe.
7.Release engine coolant hose from heater
return pipe and collect pipe.Refit
1.Connect engine coolant hose to heater return
pipe and secure with clip.
2.Position heater return pipe to cylinder block and
secure with bolt.
3.Secure engine harness and vacuum pipe to
heater return pipe and secure with clips.
4.Fit and tighten bolt securing heater return pipe
to heater feed pipe.
5.Connect heater return hose to heater return
pipe and secure with clip.
6.Refill engine coolant.

+ COOLING SYSTEM - V8,
ADJUSTMENTS, Drain and refill.
M80 0437
M80 0438
4
46
7
5

AIR CONDITIONING
DESCRIPTION AND OPERATION 82-9
Heater assembly
1Distribution servo motor
2Refrigerant inlet and outlet connector block
3RH blend flap servo motor4Thermostatic expansion valve
5LH blend flap servo motor
The heater assembly controls the temperature and distribution of air supplied to the distribution ducts, and is similar
to the heater assembly installed in non A/C vehicles.

+ HEATING AND VENTILATION, DESCRIPTION AND OPERATION, Description. The only differences from
the heater assembly in non A/C vehicles are as follows:
lThe thermostatic expansion valve, evaporator and evaporator temperature sensor are installed at the air inlet
side of the casing.
lThree servo motors operate the control flaps instead of control cables.
lA coolant temperature sensor is installed against the heater matrix.
The servo motors are controlled by the ATC ECU. Feedback potentiometers in the servo motors provide the ATC ECU
with flap position signals.

AIR CONDITIONING
DESCRIPTION AND OPERATION 82-19
Diagnostics
The ATC ECU performs a diagnostic check each time the ignition is switched on. To avoid nuisance fault indications
at low light levels, the sunlight sensor is omitted from the diagnostic check. If a fault is detected, the audible warning
sounds three times and the AUTO window on the control panel display flashes for 20 seconds. The ATC ECU then
reverts to normal control but uses a default value or strategy for the detected fault. Faults are identified by performing
a manual diagnostic check of the system.
A manual diagnostic check includes a check of the sunlight sensor, and is initiated by pressing and holding the AUTO
switch and the air distribution switch, then turning the ignition switch from off to on. The audible warning sounds once
and the indications on the control panel display illuminate. FC is shown in the LH temperature window and the results
of the check are shown as a two digit fault code in the RH temperature window. If a fault is detected, the audible
warning sounds three times and the AUTO window on the display flashes on and off for 20 seconds. If more than one
fault is detected, the fault codes cycle in numerical order, at 1 Hz. The audible warning sounds as each fault code is
shown. In low light conditions, to avoid false sunlight sensor fault indications, the sunlight sensor should be illuminated
with a strong light source.
Diagnostic fault codes and fault descriptions
Code Component Fault Default value/strategy
00 - No fault found -
11 In-car temperature sensor Open or short circuit 25°C (77°F)
12 Ambient temperature sensor Open or short circuit 10°C (50°F)
Cooling fan permanently on
Display shows "- -" if external air
temperature selected
13 Thermistor Open or short circuit 0°C (32°F)
14 Heater coolant temperature sensor Open or short circuit 70°C (158°F)
21 Sunlight sensor, left output Open or short circuit No solar heating correction
22 Sunlight sensor, right output Open or short circuit No solar heating correction
31 LH temperature servo motor Open or short circuit
Motor or flap mechanism seizedServo motor locked in position
32 RH temperature servo motor Open or short circuit
Motor or flap mechanism seizedServo motor locked in position
33 Distribution servo motor Open or short circuit
Motor or flap mechanism seizedServo motor locked in position

AIR CONDITIONING
DESCRIPTION AND OPERATION 82-23
Description
The rear air conditioning system cools and recirculates air at the rear of the cabin. The system consists of refrigerant
lines, a rear evaporator/blower assembly, a distribution system and a control panel.
Cooled air from the rear evaporator/blower assembly is supplied by the distribution system to vent outlets above each
second and third row seat. The system is controlled by two switches on the control panel.
Refrigerant lines
Two refrigerant lines connect the rear evaporator/blower assembly to the front A/C refrigerant system. The lines are
routed along the LH underside of the vehicle and secured to a connector block in the floor. A heat shield protects the
lines where they pass above the rear silencer.

AIR CONDITIONING
82-32REPAIRS
8.Remove 3 remaining bolts securing cooling fan
support rails to condenser.
9.Remove condenser.
10.Remove bolt securing adaptor block to receiver
drier.
11.Remove adaptor block from receiver drier and
discard 'O' ring.
CAUTION: Always fit plugs to open
connections to prevent contamination.12.Remove bolt securing condenser pipe to
receiver drier.
13.Remove clamp bolt receiver drier to bracket
and remove drier from bracket.
14.Remove and discard 'O' ring from condenser
pipe.
CAUTION: Always fit plugs to open
connections to prevent contamination.
15.Remove 2 remaining bolts securing receiver
drier brackets and condenser LH mounting
bracket to condenser.
16.Remove mounting bracket assembly.
17.Remove remaining bolt securing condenser RH
mounting and remove mounting.
18.Remove sealing strip from outer upper seam of
condenser.
19.Remove captive nut plates from condenser.

AIR CONDITIONING
REPAIRS 82-33
Refit
1.Fit captive nut plates to new condenser.
2.Fit seal to condenser.
3.Fit RH mounting bracket to condenser and
secure with bolt.
4.Fit receiver drier bracket assembly and secure
with bolts.
5.Ensure condenser pipe and new receiver drier
connections are clean.
6.Lubricate new 'O' ring with refrigerant oil and fit
to condenser pipe.
7.Fit receiver drier to bracket and condenser
pipe. Tighten bolt securing condenser pipe to 5
Nm (3.7 lbf.ft). Fit clamping bolt securing
receiver drier to bracket and tighten to 5 Nm
(3.7 lbf.ft).
8.Ensure adaptor block and receiver drier
connections are clean.
9.Lubricate new 'O' ring with refrigerant oil and fit
to adaptor block.
10.Fit adaptor block to receiver drier and tighten
bolt to 5 Nm. (3.7 lbf.ft).
11.Fit condenser assembly.
12.Fit cooling fan to condenser and fit bolts to
secure support rails to condenser brackets.
13.Ensure connections of condenser, receiver
drier and evaporator pipes are clean.
14.Lubricate new 'O' ring seals with refrigerant oil
and fit one seal to each evaporator pipe.
15.Connect evaporator pipes and tighten bolts to 5
Nm (3.7 lbf.ft).
16.Connect multiplug to dual pressure switch.
17.Fit radiator.
l

+ COOLING SYSTEM - Td5,
REPAIRS, Radiator.
l

+ COOLING SYSTEM - V8,
REPAIRS, Radiator.
18.Recharge A/C system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
Receiver drier and dual pressure switch
$% 82.17.03
Remove
1.Recover refrigerant from air conditioning
system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
2.Remove front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY.
3.Disconnect multiplug from dual pressure
switch.
4.Remove bolt securing condenser pipe to
receiver drier.
5.Disconnect condenser pipe from receiver drier.
CAUTION: Always fit plugs to open
connections to prevent contamination.

WIPERS AND WASHERS
84-2 DESCRIPTION AND OPERATION
Front wiper components
1Linkage assembly
2Wiper motor
3Stud plate
4Gasket
5Wheel box 2 off
6Bolt 2 off
7Earth strap
8Cover plate9Bolt 3 off
10Lock washer
11Nut
12Flanged nut 5 off
13Wiper blade 2 off
14Cover
15Nut
16Wiper arm 2 off

WIPERS AND WASHERS
DESCRIPTION AND OPERATION 84-3
Rear wiper components
1Wiper blade
2Washer jet
3Washer
4Seal
5Washer 2 off
6Lock washer 2 off
7Bolt 2 off8Wiper motor
9Nut
10Nut
11Cover
12Wiper arm
13Washer tube

WIPERS AND WASHERS
84-6 DESCRIPTION AND OPERATION
Wipers and washers block diagram