300Tdi Discovery
26
COOLING SYSTEM
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 Trouble Shooting
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.
