Perform the following procedures in order to determine if
the pressure cap is damaged or if a leak exists in the
Perform the "Visual Inspection Of The Cooling
Perform the "Testing The Pressure Cap" procedures.
Perform the "Testing The Radiator And Cooling
System For Leaks" procedures.
Check the tension of all belts on the engine. Refer to
the Testing And Adjusting, "Belt Tension Chart" for
If the coolant does not flow through the radiator and
through other components of the cooling system,
perform the following procedures:
Perform the "Testing The Water Temperature
Clean the radiator and other components with hot
water or steam at low pressure. Detergent in the
water may also be used. Compressed air may be
used to remove materials from the cooling system.
Identify the cause of the restriction before you choose
the method for cleaning.
Straighten any fins of the radiator if the fins are bent.
Check the high idle of the engine. The engine may
overheat if the high idle rpm is set too high.
Timing of the engine which is incorrect may also cause
overheating of the engine. Late timing creates more
heat in the engine. Early timing creates less heat in the
NOTE: If the timing of the engine is too early, the exhaust
valves may be burned and damage to the exhaust
manifold may occur.
Cooling System Conditioner
Supplemental cooling system additive contains alkali. To
prevent personal injury, do not drink, avoid contact with
the skin and eyes.
All water is corrosive at engine operating temperature.
The cooling system should be protected with a 3% to 6%
concentration of cooling system conditioner at all times.
Caterpillar does not recommend the use of cooling system
solutions that are intended to stop leaks.
Use of these products may result in excessive internal
deposits that could reduce the engine's heat transfer
Caterpillar Cooling System Conditioner can be used with an
antifreeze or without an antifreeze of ethylene glycol base in
When the conditioner is added to the coolant, the cooling
system must be flushed and the cooling system must be
cleaned. Refer to Operation and Maintenance, "Cooling
System Specifications" for additional information.