1999 LAND ROVER DISCOVERY air conditioning

GENERAL INFORMATION
03-26
Precautions for refrigerant recovery, recycling
and recharging
When the air conditioning system is recharged, any
existing refrigerant is first recovered from the system
and recycled. The system is then charged with the
required weight of refrigerant and volume of
refrigerant oil.
WARNING: Refrigerant must always be recycled
before re-use to ensure that the purity of the
refrigerant is high enough for safe use in the air
conditioning system.
Recycling should always be carried out with
equipment which is design certified by
Underwriter Laboratory Inc. for compliance with
SAE J1991. Other equipment may not recycle
refrigerant to the required level of purity.
A R134a Refrigerant Recovery Recycling
Recharging Station must not be used with any
other type of refrigerant.
Refrigerant R134a from domestic and
commercial sources must not be used in motor
vehicle air conditioning systems.
CAUTION: The system must be evacuated
immediately before recharging commences.
Delay between evacuation and recharging is not
permitted.
Air Conditioning Compressor
Replacement
A new compressor is supplied filled with a full charge
(X cm3) of refrigerant oil.

+ CAPACITIES, FLUIDS, LUBRICANTS
AND SEALANTS, Capacities.A calculated quantity
of oil must be drained from the new compressor
before fitting. To calculate the quantity of oil to be
drained:
1Remove the drain plug from the old
compressor.
2Invert the compressor and gravity drain the oil
into a calibrated measuring cylinder. Rotate the
compressor clutch to ensure the compressor is
completely drained.
3Note the quantity of oil drained (Y cm
3).
4Calculate the quantity of oil to be drained from
the new compressor using the following
formula:
X cm
3 — (Y cm3 + 20 cm3) = Q cm3
5Remove the drain plug from the new
compressor and drain Q cm3 of oil. Fit and
tighten the compressor drain plug.

GENERAL DATA
04-21
Air conditioning
Type CFC free, sealed closed loop
Compressor:
⇒ Displacement 177.7 cm
3/rev (10.84 in3/rev)
⇒ Relief valve operating pressure 34.3 to 41.4 bar (497 to 600 lbf.in
2)
⇒ Refrigerant oil quantity 180ml (6.3 fl.oz)
Dual pressure switch operating pressures (nominal):
⇒ Low pressure switch Opens 2.0 bar (29.0 lbf.in
2), pressure decreasing
⇒ Low pressure switch Closes 2.3 bar (33.4 lbf.in
2), pressure increasing
⇒ High pressure switch Opens 32 bar (464 lbf.in
2), pressure increasing
⇒ High pressure switch Closes 26 bar (377 lbf.in
2), pressure decreasing

TORQUE WRENCH SETTINGS
06-20
Heating and air conditioning
Wipers and washers
TORQUE DESCRIPTION METRIC IMPERIAL
Heater assembly16 Nm (12 lbf.ft)
Compressor bolts22 Nm (16 lbf.ft)
Blower motor19 Nm (14 lbf.ft)
Compressor to mounting bracket bolts 25 Nm (18 lbf.ft)
A/C pipes to compressor bolts 10 Nm (7 lbf.ft)
Condenser pipe bolt 5 Nm (3.7 lbf.ft)
Receiver drier to bracket bolts 5 Nm (3.7 lbf.ft)
Adaptor block to receiver drier bolt 5 Nm (3.7 lbf.ft)
Evaporator pipe bolts 5 Nm (3.7 lbf.ft)
Dual pressure switch to receiver drier 10 Nm (7 lbf.ft)
Air conditioning pipes to receiver drier bolts 5 Nm (3.7 lbf.ft)
TX valve pressure pipe union 22 Nm (16 lbf.ft)
Evaporator pipe to TXV valve 32 Nm (24 lbf.ft)
Evaporator assembly to body bolts 16 Nm (12 lbf.ft)
High and low pressure pipe, bolts 10 Nm (7 lbf.ft)
Fuel burning heater Torx bolts 25 Nm (18 lbf.ft)
TORQUE DESCRIPTION METRIC IMPERIAL
Link to motor spindle 7 Nm (5.2 lbf.ft)
Front motor assembly 2.5 Nm (1.8 lbf.ft)
Spindle nut 3 Nm (2.2 lbf.ft)
Wiper arm nut13 Nm (10 lbf.ft)

CAPACITIES, FLUIDS, LUBRICANTS AND SEALANTS
09-2
Fluids
Anti-freeze
Use Havoline Extended Life Coolant (XLC), or any
ethylene glycol based anti-freeze (containing no
methanol) with only Organic Acid Technology (OAT)
corrosion inhibitors, to protect the cooling system
CAUTION: No other anti-freeze should be used
with Havoline Extended Life Coolant.
The cooling system should be drained, flushed and
refilled with the correct amount of anti-freeze solution
at the intervals given on the Service Maintenance
Check Sheet.
After filling with anti-freeze solution, attach a warning
label to a prominent position on the vehicle stating
the type of anti-freeze contained in the cooling
system to ensure that the correct type is used for
topping-up.
Brake/Clutch fluid
Use only DOT 4 brake fluid.
PAS fluid
Use Texaco cold climate power assisted steering
fluid PSF 14315.
ACE fluid
Where ambient temperature falls below -20° C (-4°
F), use only Texaco cold climate power assisted
steering fluid PSF 14315. Where ambient
temperature remains above -20° C (-4° F), use either
Texaco cold climate power assisted steering fluid ,
Dexron 11 or Dexron 111 non-synthetic fluid.
Air conditioning
Use only refrigerant R134a.
Refrigerant oil
Use only Nippon Denso ND-oil 8.
Refrigerant oil absorbs water and must not be stored
for long periods. Do not pour unused oil back into the
container.
NOTE: The total quantity of refrigerant oil in the
system is 180 ml.
CAUTION: Do not use any other type of
refrigerant oil.
Anti-Freeze Concentration
The overall anti-freeze concentration should not fall,
by volume, below 50% to ensure that the anti-
corrosion properties of the coolant are maintained.
Anti-freeze concentrations greater than 60% are not
recommended as cooling efficiency will be impaired.
The following recommended quantities of anti-freeze
will provide frost protection to -48°C (-53°F):
Engine - TD5
Engine - V8
Concentration 50%
Amount of Anti-freeze 4 litres
Concentration 50%
Amount of Anti-freeze 6.5 litres
13.5 pts (US)

CAPACITIES, FLUIDS, LUBRICANTS AND SEALANTS
09-4
Gearbox oil
Manual Gearbox: Use Texaco MTF 94 oil for refill
and topping-up.
Automatic Gearbox: Use Texamatic 9226, ATF
Dexron 11D or Dexron 111 for refill and topping-up
Transfer box
Use Texaco Multi-Gear 75W/90R or oil meeting
specification API GL5.
Front and rear axles
Use Texaco Multi-Gear 75W/90R.
Air Conditioning
Use lubricating oil Nippon Denso ND-8.
General Greasing
Use Multipurpose Lithium Base Grease N.L.G.I.
consistency No. 2.
Bonnet latch
Lubricate cable and latch with oil.
Sealants
The following table lists those sealants which are
used during repair / overhaul procedures covered in
this manual; it is essential that the sealant specified
for a particular procedure is used at all times.
Component Application Land Rover
Part No.
Td5 Engine Timing chain fixed
guide Allen screwSTC 50552
Td5 Engine Camshaft cover
gasket joint lineSTC 50550
Td5 Engine Oil pick-up strainer
Torx screwsSTC 50552
Td5 Engine Oil pump drive
sprocket retaining
boltSTC 50552
Td5 Engine Timing chain cover,
crankshaft rear oil
seal and sump
gasket joint linesSTC 50550
Td5 Engine Oil pressure relief
valve plugSTC 50552
Td5 Engine Camshaft carrier to
cylinder headSTC 4600
Td5 Engine Timing cover STC 50550
V8 Engine Sump gasket to
cylinder blockSTC 50550
V8 Engine 'V' grooves at end
of cylinder head -
Inlet manifold
gasketSTC 50550
V8 Engine Cruciform seal
endsSTC 50550
V8 Engine Dipstick tube STC 50554
V8 Engine Timing cover bolts STC 50552
Engine
Management
System - V8Engine coolant
temperature (ECT)
sensor threadsSTC 50552
Manifolds and
Exhaust
System - V8'V' grooves at end
of cylinder head -
Inlet manifold
gasketSTC 50550
Manual
Gearbox -
R380Gear selector
housingSTC 4404
Manual
Gearbox -
R380Selector housing
boltsSTC 50552
Manual
Gearbox -
R380Input shaft oil seal
housingSTC 4404
Manual
Gearbox -
R380Reverse inhibitor
shaft threadsSTC 50552

ENGINE - V8
REPAIRS 12-2-19
Gasket - rocker cover - LH
$% 12.29.40
Remove
1.Remove upper inlet manifold gasket.

+ MANIFOLDS AND EXHAUST
SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.
2. Models with air conditioning: Release 4
clips and remove fan cowl.
3. Models with air conditioning: Release
tension on auxiliary drive belt and remove belt
from air conditioning compressor. Disconnect
compressor multiplug. Remove 4 bolts
securing compressor and position compressor
aside. 4.Release ht leads from rocker cover clips.
5.Remove screw securing dip stick tube.
6.Noting fitted position of 2 long screws or multi-
hex bolts, remove and discard screws/bolts
securing rocker cover; remove rocker cover.
CAUTION: Screws/bolts must be replaced
with new 'patched' multi-hex bolts.
7.Remove and discard rocker cover gasket.

ENGINE - V8
12-2-20 REPAIRS
Refit
1.Clean mating faces of rocker cover and
cylinder head, ensure bolt holes are clean and
dry.
2.Fit a new gasket dry, position rocker cover
ensuring gasket is correctly located.
3.Fit new 'patched' multi-hex rocker cover bolts
ensuring that 2 short bolts are on side of rocker
cover nearest centre of engine.
4.Tighten bolts by diagonal selection to:
lStage 1 - 3 Nm (2.5 lbf.ft)
lStage 2 - 8 Nm (6 lbf.ft)
5.Ensure that outer rim of gasket is correctly
positioned around periphery of rocker cover.
6.Fit and tighten screw securing dip stick tube.
7.Secure ht leads in rocker cover clips.
8. Models with air conditioning: Clean
compressor dowels and dowel holes. Position
compressor, fit bolts and tighten to 22 Nm (16
lbf.ft). Release auxiliary drive belt tensioner
and fit belt to compressor.
9. Models with air conditioning: Position fan
cowl and secure clips.
10.Fit upper inlet manifold.

+ MANIFOLDS AND EXHAUST
SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.
Gasket - rocker cover - RH
$% 12.29.41
Remove
1.Drain cooling system.

+ COOLING SYSTEM - V8,
ADJUSTMENTS, Drain and refill.
2.Remove upper inlet manifold gasket.

+ MANIFOLDS AND EXHAUST
SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.
3. Models with SAI: Disconnect 2 air manifold
unions from adapters in cylinder head and
remove manifold.
CAUTION: Take care that air manifold pipes
are not damaged during removal of union
nuts.
4.Remove 2 bolts securing coolant rails to inlet
manifold.

ENGINE - V8
12-2-40 REPAIRS
6.Remove 2 bolts securing radiator LH and RH
upper mounting brackets to body panel and
remove brackets.
7.Remove 4 screws securing air conditioning
condenser LH and RH upper mounting
brackets to condenser.
8.Remove condenser upper mounting brackets
with rubber mounts from radiator extension
brackets.
9.Remove 2 bolts securing LH and RH extension
brackets to radiator and remove brackets.
10.Position absorbent cloth under each oil cooler
hose connection to collect oil spillage. 11.Push against coupling release rings and
disconnect both hoses from oil cooler.
CAUTION: Always fit plugs to open
connections to prevent contamination.
12.Remove screw securing oil cooler to radiator.
13.Release cooler from its location on radiator.
14.Release radiator lower mountings from
location in chassis and carefully move radiator
towards engine sufficiently only to release
engine oil cooler from radiator.
15.Remove engine oil cooler.
Refit
1.Fit engine oil cooler to radiator, engage in
location and secure with screw.
2.Fit radiator to location in chassis.
3.Ensure connections are clean, then secure
hoses to oil cooler.
4.Fit extension brackets to radiator and secure
with bolts.
5.Fit brackets with rubber mounts to extension
brackets and secure to air conditioning
condenser with screws.
6.Fit radiator upper mounting brackets and
secure to body with bolts.
7.Fit LH horn and secure with nut.
8.Fit LH and RH air deflectors to front panel and
secure with scrivets.
9.Fit front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY..
10.Fit cooling fan cowl and secure with fixings.
11.Fit battery cover and secure with fixings.
12.Top up engine oil.