1. Cooling Systems Purpose: 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

2. Cooling Systems Types Air CooledLiquid Cooled Heat of Combustion = Surrounding metal = Passing Air Heat of Combustion = Surrounding metal = Passing Coolant = Coolant removed = Metal of Radiator = Passing Air

3. Liquid Cooling Components Water Jackets Heater Core Lower Rad Hose Automatic Transmission Cooler Upper Rad Hose Radiator Heater Core hoses

4. Liquid Cooling Components Thermostat Fans Temperature Sensor Water Pump Drive Belts V Belt Serpentine Straight Blade Clutch Fan Flex Fan Electric Fan

5. 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

6. Cooling System Service Antifreeze 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”