Cooling Systems Purpose: to keep the engine at it’s most efficient operating temperature TOO HOT! TOO COLD! - poor lubrication - excessive heat - seizing.

Cooling SystemsPurpose: to keep the engine at it’s most

efficient operating temperature

TOO HOT! TOO COLD!

- poor lubrication- excessive heat- seizing- poor fuel economy

- poor lubrication- power loss- poor fuel economy

Cooling Systems TypesAir CooledLiquid Cooled

Heat of Combustion = Surrounding metal = Passing AirHeat of Combustion = Surrounding metal = Passing Coolant = Coolant removed = Metal of Radiator = Passing Air

Liquid Cooling Components

Water Jackets

Heater Core

Lower Rad Hose

Automatic Transmission Cooler

Upper Rad Hose

Radiator

Heater Corehoses

Liquid Cooling Components

Thermostat

Fans

Temperature Sensor

Water Pump

Drive Belts

V BeltSerpentine

Straight Blade

Clutch Fan

Flex Fan

Electric Fan

Antifreeze (Ethylene Glycol)Prevents Freezing by lowering the freezing temperature:

- can cause cracking of the block and head- very rapid over heating due to no flow

Prevents Overheating by raising the boiling temperature:- can cause severe engine damage- cylinder head warping- cracking of the block and head

Also contains other chemicals:

- water pump lubricants- corrosion inhibitors- leak agents- foam inhibitors

Cooling System ServiceAntifreeze strength:System Maintenance

-visual inspection - strength testing- PH levels- pressure testing- replace hoses etc 4-5 yrs- replace antifreeze 2-3 yrs

Replace Antifreeze:

-every 2 – 3 years, due to contamination and added chemical determination

“The process”