1. The Engine Cooling System
Cooling System Functions:
Remove excess heat
Control engine temperatures
Control combustion
Protect the engine
33% - Horsepower
30% - Exhaust
7% - Radiation
30% - Cooling System
Overview: The water pump circulates coolant through the engine block and heads. The coolant picks up heat from combustion as it flows through the passages. When the coolant reaches the thermostat set point temperature, it opens diverting hot coolant to the radiator, and closes when the coolant becomes too cool. In the radiator, the coolant transfers heat to the radiator fins and to the atmosphere. The radiator cap is a critical component to maintain cooling system pressure and a high boiling point for the coolant.

2. Antifreeze / Engine Coolant Functions
Provide effective heat transfer properties
Protect against freeze-up damage
Protect against boil-over damage
Protect system metals against all forms of corrosion
Cooling System Metals Types of Corrosion
Iron and gray cast iron General corrosion
Steel Cavitation pitting
Aluminum and aluminum alloys Erosion corrosion
Copper and brass alloys Galvanic – electrolysis
Solder and solder alloys Crevice – scale corrosion

3. An Antifreeze / Engine Coolant Contains:
Ethylene Glycol (MEG)
Quality Water +
Corrosion
inhibitor
Freeze Protection
Heat Transfer
Corrosion Protection
Boil Over Protection