C7 Industrial Engines Testing and Adjusting – Cooling System – Inspect

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.

  1. Check the coolant level in the cooling system. Refer to Operation and Maintenance Manual, “Cooling System Coolant Level – Check”.


  1. Check the quality of the coolant. The coolant should have the following properties: 
    • Color that is similar to new coolant 
    • Odor that is similar to new coolant 
    • Free from dirt and debris 

    If the coolant does not have these properties, drain the system and flush the system. Refill the cooling system with the correct mixture of water, antifreeze, and coolant conditioner. Refer to the Operation and Maintenance Manual for your engine in order to obtain coolant recommendations.


  1. 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.


  1. Ensure that the 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.


  1. Inspect the drive belts for the fan.


  1. Check for damage to the fan blades.


  1. Look for air or combustion gas in the cooling system.


  1. Inspect the filler cap, and check the surface that seals the filler cap. This surface must be clean.


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