Chapter 47 PowerPoint

Define these Technical Terms using the textbook:

1. coolant temperature sensor

2. electric cooling fan

3. heater core

4. heater hoses

5. radiator

6. radiator cap

7. radiator petcock

8. thermostat

9. water pump

Answer these discussion questions using the textbook:

1. List major cooling system components found in modern vehicles.

Read the chapter summary below:

■ Vehicle cooling systems must remove excess heat from the engine, maintain a constant engine operating temperature, increase the temperature of a cold engine quickly, and provide a means for warming the passenger compartment.

■ Engine operating temperature is typically between 180°F (82°C) and 210°F (99°C).

■ The two major types of automotive cooling systems are air cooling systems and liquid cooling systems.

■ The basic parts of an engine cooling system are the water pump, radiator hoses, radiator, fan, and thermostat.

■ The radiator transfers coolant heat to the outside air and is normally mounted in front of the engine.

■ A transmission oil cooler is often placed in the radiator on cars with automatic transmissions to prevent transmission fluid overheating.

■ The thermostat senses engine temperature and controls coolant flow through the radiator.

■ Antifreeze, usually ethylene glycol, is mixed with water to produce the engine coolant. It prevents winter freeze up, prevents rust and corrosion, lubricates the water pump,and cools the engine.

■ A block heater may be used on a diesel engine to aid engine starting in cold weather.

■ A supercharger cooling system often uses its own electric water pump, hoses, and radiator to pump cool antifreeze through the supercharger inter-cooler.

■ A hybrid cooling system can use either circulated air or circulated liquid coolant to remove excess heat from electrical/electronic components in the electric powertrain.

■ An HV battery cooling system uses circulated air to carry heat away from the battery packs and out of the battery housing.

■ Motor-generator coolant hoses carry cooled coolant to, and heated coolant from, the motor-generator water jackets.

■ An HVPCM cooling system is a cooling system totally independent of the engine cooling system.