Range Rover Classic. Manual — part 52
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FAULT DIAGNOSIS
ENGINE OVERHEATING
Before conducting any cooling system diagnosis:
See
Description and operation, Engine Cooling
1. Is coolant level correct?
NO -
Allow engine to cool, top up level to
expansion tank seam.
YES - Continue.
2. Is drive belt tension correct?
NO -
See ENGINE, Repair, Compressor
Drive Belt
YES - Continue.
3. Is coolant in radiator frozen?
YES - Slowly thaw and drain system.
See
Adjustment, Coolant
NO -
Continue.
4. Is air flow through radiator restricted or blocked?
YES - Apply air pressure from engine side of
radiator to clear obstruction.
NO -
Continue.
5. Are there any external leaks, from water pump,
engine gaskets, fast idle thermostat or the heater
unit?
YES - Investigate and rectify.
See Adjustment,
Coolant
NO -
Continue.
6. Are fan blades fitted correct way round, concave
side towards engine?
NO -
Rectify.
YES - Continue
7. Is viscous unit operating correctly?
See
Description and operation, Viscous Fan
NO -
Renew.
See Repair, Viscous
Coupling, Fan Blades, Pulley and Fan
Cowl
YES - Carry out a pressure test on radiator cap
and system. Check thermostat type,
operation and correct fitting.
See Repair,
Thermostat
If pressure test leads you to suspect coolant
leakage across gaskets, go to check 10,
otherwise: Continue.
8. Are the air conditioning fans operating correctly?
See Electrical Trouble Shooting Manual.
NO -
Rectify.
YES - Continue.
9. Is temperature sender and gauge giving
accurate readings?
NO -
Sustitute parts and compare readings.
YES - Continue.
10. Carry out cylinder pressure test to determine if
pressure is leaking into cooling system causing
over pressurising and loss of coolant.
If problem is not diagnosed, check the coolant system
for engine oil contamination and engine lubrication
system for coolant contamination.
If only the coolant system is contaminated suspect a
cylinder head gasket.
If both systems are contaminated, suspect the
radiator.
If only the lubrication system is contaminated with
coolant, suspect leakage past cylinder liner seals or
cylinder head gasket.
26
COOLING SYSTEM
RANGE ROVER
2
FAULT DIAGNOSIS
ENGINE RUNS COLD
Before conducting any cooling system diagnosis:
See
Description and operation, Engine Cooling
1. Check operation of viscous unit.
See
Description and operation, Viscous Fan
Is viscous unit operating correctly?
NO -
See Repair, Viscous Coupling, Fan
Blades, Pulley and Fan Cowl
YES - Continue.
2. Is thermostat correct type and operating?
See
Repair, Thermostat
If problem is not diagnosed: Continue.
3. Are the air conditioning fans operating
continuously?
YES -
See Electrical Troubleshooting Manual
NO -
Continue.
4. Is temperature sender and gauge giving
accurate readings? Substitute parts and
compare readings. If problem is not diagnosed
repeat tests, starting at 1.
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ADJUSTMENT
COOLANT
Service repair no - 26.10.01
Draining
WARNING: Do not remove any caps or
plugs when the engine is hot. The cooling
system is pressurised and personal
scalding could result.
1. Remove expansion tank filler cap.
2. Disconnect bottom hose from radiator and allow
coolant to drain into a container. Ensure
container is clean if reusing coolant.
NOTE: When expansion tank has emptied,
remove thermostat housing plug to assist
drainage. Similarly when coolant level is
below top of radiator, remove radiator plug.
3. Reconnect hose after draining and tighten hose
clamp.
Refit
CAUTION: In order to expel ALL air from
the cooling system, follow the procedures
carefully.
NOTE: Refill procedure is slow but can be
accelerated by squeezing hoses to assist
removal of air from the system.
4. Add correct mix of coolant into expansion tank
until radiator is full (as seen through plug hole on
top of radiator).
See LUBRICANTS, FLUIDS
AND CAPACITIES, Information, Anti-Freeze
CAUTION: Take care to avoid excess
coolant spillage from radiator.
5. Fit radiator plug.
6. Continue adding coolant into expansion tank
until coolant appears in thermostat housing.
CAUTION: Take care to avoid excess
coolant spillage from thermostat housing.
7. Fit thermostat housing plug.
8. Check coolant in expansion tank is level with
indicator post. Add more coolant if necessary.
9. Start engine and run for 5 minutes.
10. Allow engine to cool, check coolant level in
expansion tank; top up to level indicator post if
necessary.
11. Fit expansion tank filler cap.
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REPAIR
VISCOUS COUPLING, FAN BLADES, PULLEY AND
FAN COWL
Service repair no - 26.25.03/05
Viscous coupling
- Remove 1 to 3
Fan blades
- Remove 1 to 4
Fan cowl
- Remove 1 to 3
Fan pulley
- Remove 1 to 6
Remove
WARNING: Disconnect battery negative
terminal to prevent engine being started
before removing or adjusting drive belt.
1. Slacken nut securing viscous coupling/fan blade
assembly to pulley.
NOTE: Nut securing viscous unit to pulley
has a left hand thread. Release by turning
clockwise when viewed from front of
viscous unit.
2. Drop viscous unit and fan assembly into bottom
of cowling
3. Remove two fixings clips from top of cowling and
lift cowling complete with viscous unit and fan
out of lower mountings.
4. Remove fan blades from viscous coupling if
necessary.
5. Remove serpentine drive belt and, if fitted, air
conditioning compressor belt.
6. Remove pulley fixings, remove pulley.
NOTE: The serpentine belt is removed by
using a hexagonal socket and tommy bar
on the auto-tensioning pulley nut. Whilst
tensioning the device the belt can be removed.
7. Reverse removal procedure. Ensure fan blades
are fitted correctly. Fan is marked ’front’ and
should be fitted with word ’front’ closest to
radiator. Tighten to
30 Nm.
8. Refit drive belt.
See ENGINE, Repair, Drive
Belt
THERMOSTAT
Service repair no - 26.45.01
Remove
1. Partially drain cooling system, until coolant level
is below thermostat housing.
2. Disconnect hose from thermostat housing.
3. Disconnect electrical connections to water
temperature switch.
4. Remove outlet elbow.
5. Withdraw thermostat.
Test
6. Note rating of thermostat is 88˚C. Place
thermostat in a container half full of water. Heat
water, observe temperature at which thermostat
begins to open. Thermostat is satisfactory if its
open between 85˚C and 89˚C.
Refit
7. Insert thermostat with jiggle pin/vent hole upper
most (12 o’clock position) .
8. Fit the outlet elbow and new joint washer.
Tighten to
28 Nm.
9. Reverse removal procedure. 1 to 3.
10. Check for coolant leaks around all connections
and joint faces.
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