Initial Inspection and Diagnostic Overview

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical and electrical damage. Refer to the following chart.

^ Damaged hoses
^ Loose/damaged hose clamps
^ Damaged water thermostat
^ Damaged head gaskets
^ Damaged intake manifold gasket or upper intake manifold gasket
^ Damaged water pump
^ Damaged radiator
^ Damaged radiator coolant recovery reservoir
^ Damaged heater core
^ Damaged engine coolant temperature sensor
^ Damaged engine coolant temperature sensor wiring
^ Damaged water temperature indicator sender unit.
^ Damaged water temperature indicator sender unit wiring

3. If the fault is not visually evident, verify the symptom. Refer to the symptom chart. Symptom Related Diagnostic Procedures