Range Rover. Manual — part 118
BMW DIESEL
1
FAULT DIAGNOSIS
COOLING SYSTEM FAULTS
This section covers mechanical faults that could occur
in the complete cooling system :- 1 Engine (coolant)
cooling; 2 Turbo intercooling; 3. Engine oil cooling; 4.
Gearbox oil cooling.
Before conducting any visual checks within the
separate systems and undertaking detailed diagnosis
procedures.
See Description and operation.
1. ENGINE (COOLANT) COOLING SYSTEM
Symptom - Engine Overheating
POSSIBLE CAUSE
REMEDY
1. Engine coolant low.
1. Allow engine to cool. Top up expansion tank to correct level, with
engine running at idle. Check cooling system for leaks and rectify if
necessary.
2. Loose drive belt.
2. Check/renew drive belt tensioner or renew drive belt.
See
ELECTRICAL, Repair.
3. Coolant in radiator frozen.
3. Slowly thaw and drain cooling system.
See Repair.
4. Air flow through radiator
restricted or blocked.
4. Apply air pressure to engine side of radiator to clear obstruction. If
mud or dirt is evident, carefully use a hose.
5. External leaks from water
pump, engine gaskets,
thermostat housing or
pipe/hoses.
5. Check for visual causes and rectify.
6. Viscous fan not operating
correctly or inoperative.
6. Renew viscous fan unit.
See Repair.
7. Thermostat seized in closed
position.
7. Check radiator bottom hose for coolant flow through radiator. If cold
a faulty thermostat is confirmed. Renew thermostat.
See Repair.
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COOLING SYSTEM
NEW RANGE ROVER
2
FAULT DIAGNOSIS
Symptom - Engine Overheating Continued
POSSIBLE CAUSE
REMEDY
8. Air in cooling system.
8. Check coolant level. Run engine at fast idle (approximately 2,000
rpm) with expansion tank cap off. Top up coolant level with engine
at idle and refit expansion tank cap.
9. Air conditioning condenser fans
not operating correctly or
inoperative.
9.
See AIR CONDITIONING, Fault diagnosis.
10. Temperature gauge or sender
unit giving inaccurate readings.
10. Refer to TestBook .
11. Coolant leakage across
cylinder head gasket.
11. Carry out cylinder pressure test to determine if pressure is leaking
into cooling system, causing over pressurising and loss of coolant.
Renew cylinder head gasket.
12. Engine oil contamination of
cooling system due to leaking.
12. Renew cylinder head gasket.
See ENGINE, Repair.
13. Coolant contamination of
lubrication system.
13. Renew inlet manifold or front cover gaskets.
See MANIFOLD AND
EXHAUST SYSTEM, Repair. or See ENGINE, Repair.
Symptom - Engine Runs Cold
POSSIBLE CAUSE
REMEDY
1. Thermostat seized in open or
partially open position.
1. Remove thermostat housing and check operation of thermostat.
Renew, if necessary.
See Repair.
2. Temperature gauge or sender
unit giving inaccurate readings.
2. Refer to TestBook .
3. Viscous fan not operating
correctly.
3. Renew viscous fan unit.
See Repair.
4. Air conditioning condenser fans
operating continuously.
4. Refer to TestBook .
BMW DIESEL
3
FAULT DIAGNOSIS
2. TURBO INTERCOOLING SYSTEM
Symptom - Loss of Performance
POSSIBLE CAUSE
REMEDY
1. Cooling air flow through
intercooler matrix restricted or
blocked.
1. Apply air pressure to engine side of radiator to clear obstruction. If
mud or dirt is evident, carefully use a hose.
2. Charge-air flow through
intercooler matrix restricted.
2. Check for blocked air cleaner element and renew, if necessary.
See SECTION 10, Maintenance.
3. Blocked air cleaner.
3. Renew air cleaner element.
See SECTION 10, Maintenance.
4. Pipe/hose leaks in intercooler
system.
4. Tighten all joint connections or renew components as necessary.
5. Turbocharger not operating
correctly or inoperative.
5. Substitute parts and recheck.
See FUEL SYSTEM, Repair.
6. Customer fitted grille blind
restricting cooling air flow.
6. Remove blind or advise accordingly.
3. ENGINE OIL COOLING SYSTEM
Symptom - Engine Oil Overheating
POSSIBLE CAUSE
REMEDY
1. Air flow through oil cooler
matrix restricted or blocked.
1. Apply air pressure to engine side of radiator to clear obstruction. If
mud or dirt is evident carefully use a hose.
2. Blocked or damaged oil cooler
or pipe/hoses, restricting
engine oil flow.
2. Check for visual damage and renew components where necessary.
3. Oil cooler relief valve seized in
closed position.
3. Remove and check relief valve. Renew if necessary.
26
COOLING SYSTEM
NEW RANGE ROVER
4
FAULT DIAGNOSIS
4. GEARBOX OIL COOLING SYSTEM
Symptom - Gearbox Oil Overheating
POSSIBLE CAUSE
REMEDY
1. Blocked or damaged oil cooler
or pipe/hoses restricting
gearbox oil flow.
1. Check for visual damage and renew components where necessary.
2. Leaking coolant from oil cooler
water tank.
2. Remove radiator, inspect for source of leak and repair.
See Repair.
3. Vehicle being driven in wrong
gear.
3. Advise owner/driver accordingly.
NOTE: Critical warning messages relating
to the complete cooling system are
displayed on the message centre of the
instrument pack, should a fault occur in any of the
separate systems.
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