1. Check coolant level in the cooling system.
2. Look for leaks in the system.
NOTE: Water pump seals. A small amount of coolant leakage across the surface of the “face-type” seals is normal, and required, to provide lubrication for this type of seal. A hole is provided in the water pump housing to allow this coolant to drain from the pump housing. Intermittent leakage of small amounts of coolant from this hole is not an indication of water pump seal failure. Replace the water pump seals only if a large amount of leakage, or a constant flow of coolant is observed draining from the water pump housing.
3. Look for bent radiator fins. Be sure that air flow through the radiator does not have a restriction.
4. Inspect the drive belts for the fan.
5. Check for damage to the fan blades.
6. Look for air or combustion gas in the cooling system.
7. Inspect the filler cap and the surface that seals the cap. This surface must be clean.