Cooling systems that are not regularly inspected are the cause for increased engine temperatures. Make a visual inspection of the cooling system before any tests are performed.
Personal injury can result from escaping fluid under pressure.
If a pressure indication is shown on the indicator, push the release valve in order to relieve pressure before removing any hose from the radiator.
- Check the coolant level in the cooling system.
- Look for leaks in the system.
Note: A small amount of coolant leakage across the surface of the water pump seals is normal. This leakage is required in order to provide lubrication for this type of seal. A hole is provided in the water pump housing in order to allow this coolant/seal lubricant 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.
- Make sure that air flow through the radiator does not have a restriction. Look for bent core fins between the folded cores of the radiator. Also, look for debris between the folded cores of the radiator.
- Inspect the drive belts for the fan.
- Check for damage to the fan blades.
- Look for air or combustion gas in the cooling system.
- Inspect the filler cap, and check the surface that seals the filler cap. This surface must be clean.
- Look for large amounts of dirt in the radiator core. Look for large amounts of dirt on the engine. Remove the dirt from the radiator core and the engine.
- Fan shrouds that are loose or missing cause poor air flow for cooling.