Special tool
 | Cooling System Pressure Tester 303-396 (24-001-A) |
 | Adapter for pressure testing of the cooling system 303-396-03 (24-001-A-03) |
Inspection and verification
1. Check the validity of the customer's complaint by using the system.
2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual inspection table
|
Mechanical factors |
Electrical factors |
|
- Leaks – Expansion tank of the cooling system – Electric fan(s) - Radiator - Water pump – Accessory drive belt |
- Fuse - Wiring harness – Loose or corroded connector(s) – Cylinder head temperature sensor |
3. If an obvious cause for the problem you have identified or the customer has described is found, correct the problem (if possible) before proceeding further.
4. If the cause of the problem is not visually obvious, clarify the symptom of the problem and refer to the Symptom Table.
Table of signs of malfunction
|
State |
Possible Causes |
Action |
|
•Lack of coolant |
•Hose(s) •Hose connections/couplings •Radiator •Water pump •Cooling system expansion tank •Heat core •Gasket(s) •Cracks in the engine casting •Cylinder block rod plugs |
• Proceed to PINPOINT TEST A. |
|
•Engine overheating |
•Loss of coolant. •Clogging/narrowing of the flow cross-section of the system mains •Thermostat •Fuse(s). •Electrical circuit(s). •Cooling fan motor. •Water pump •Accessory drive belt •Cylinder head temperature sensor (CHT) •Powertrain Control Module (PCM) |
• Proceed to PINPOINT TEST B. |
|
•The engine does not reach normal operating temperature |
•Thermostat •Cooling fan motor. |
• Proceed to PINPOINT TEST C. |
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