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”