5.2 - Typical Problems

Cooling systems generate 3 types of problems.

First - System Leaks

The cooling system must be leak-free. All leaks must be repaired. Sometimes leaks are temperature-related and the system will only leak either when cold or hot. Retest after repair.

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Second - Overheating

The overheating of an engine is usually related to the following conditions:

• Low coolant liquid in the system;
• Lack of airflow across the radiator;
• Water pump or slow coolant circulation in the system;
• Radiator cooling fan inoperative;
• Thermostat stuck closed;
• Pure cooling liquid in the system;
• Air in the system;
• Engine mechanical problems like engine timing, restricted exhaust system or worn water pump;
• Air conditioning system affecting engine cooling when turned on when heat generated from the condenser.