300Tdi Discovery
HEATING AND VENTILATION
1
FAULT DIAGNOSIS
HEATER OUTPUT
Symptom:-
Heater emits cold air.
1. Engine running: Check coolant valve opens as a
temperature control is moved from COLD.
2. Check for engine running cold.
See COOLING
SYSTEM, Fault diagnosis, Engine Runs Cold
3. Check heater pipes and hoses for blockage or
restriction.
4. Check heater matrix for blockage or restriction,
flush system.
Heater emits warm air.
5. Engine running: Check coolant valve closes
when both temperature controls are moved to
COLD.