Range Rover P38
LAND ROVER V8
1
FAULT DIAGNOSIS
COOLING SYSTEM FAULTS
This section covers mechanical faults that could occur
in the complete cooling system :
1. Engine (coolant) cooling;
2. Engine oil cooling;
3. 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 housing
assembly.
See Repair.
