Symptom Related Diagnostic Procedures

Symptom Chart

A: LOSS OF COOLANT
A1: VISUAL INSPECTION
1. Visually inspect for loss of coolant
2. Carry out a system pressure test.
^ Is the engine cooling system leaking?
-> Yes
Rectify the leak as indicated by the test result. TEST the system for normal operation.
-> No
Verify the customer complaint.

B: THE ENGINE OVERHEATS
B1: CHECK COOLANT

WARNING: THE COOLING SYSTEM IS PRESSURIZED! MAKE SURE THE RESERVOIR CAP IS NEVER RELEASED UNTIL THE SYSTEM HAS COOLED. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

1. Check the coolant level and condition.
^ Does the system contain sufficient coolant of the correct specification?
-> Yes
Go to [B2]
-> No
Top-up the system.
Check for coolant loss. Go to [A]

B2: CHECK THERMOSTAT
1. Check the thermostat. See component tests.
^ Is the thermostat OK?
-> Yes
Cooling fans, modules, circuits, sensors, etc. are tested.
-> No
INSTALL a new thermostat. TEST the system for normal operation.

C: THE ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE
C1: CHECK THERMOSTAT
1. Check the thermostat. See component tests.
^ Is the thermostat OK?
-> Yes
Cooling fans, modules, circuits, sensors, etc. are tested.
-> No
INSTALL a new thermostat. TEST the system for normal operation.