1. Auto Upkeep Basic Car Care, Maintenance, and Repair (2nd Edition)
Chapter 1 - Introduction and How Cars Wor
Auto Upkeep Basic Car Care, Maintenance, and Repair (2nd Edition)
Chapter 12
Cooling System and Climate Control
Chapter 12
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2. Chapter 1 - Introduction and How Cars Wor
Fuel for Thought
Why is it important for the engine to run at an optimum temperature?
How does coolant circulate in an engine?
How is heat transferred to the passenger compartment?
Chapter 12
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Objectives
Upon completion of this chapter and activities, you will be able to:
Identify the purpose of the cooling system.
Describe the cooling system’s components.
Define coolant properties.
Explain how coolant flows in an engine.
Test and service the cooling system.
Change a passenger cabin air filter.
Chapter 12
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4. Cooling System Purpose
Reach operating temperature quickly
Maintain operating temperature
Remove excess engine heat
Provide passenger comfort
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5. Cooling System Components
Radiator
Removes/transfers heat from the coolant to the outside air.
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6. Cooling System Components
Radiator cap
Maintains a constant pressure in the cooling system
Generally 8 to 16 psi (55 to 110 kPa)
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7. Cooling System Components
Thermostat
Controls the temperature in the cooling system.
Usually between ºF (82-91ºC).
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8. Cooling System Components
Coolant Recovery Tank
Also called an expansion tank, holds excess coolant – keeps the system “closed”.
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9. Cooling System Components
Radiator fan
Draws air through the radiator
Mechanical or electrical driven
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10. Cooling System Components
Radiator and heater hoses
Upper and lower radiator hoses
Heater hoses connect to the heater core
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11. Cooling System Components
Clamps
Securely attach hoses to other components
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12. Cooling System Components
Water pump
Circulates the coolant
Chapter 12
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13. Cooling System Components
Drive belts
Turn some water pumps and mechanical fans
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Coolant Properties
Prevents freezing and boiling
Lubricates the water pump
Inhibits corrosion
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Coolant Flow
Chapter 12
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Heater Core
Mounted between the passenger’s compartment and engine compartment.
Transfers heat for passenger comfort.
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Cabin Air Filter
Cleans air in the HVAC system.
Change every 15,000 miles (or 24,000 km)
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Air Conditioning
Remove heat and humidity from the air for passenger comfort.
Refrigerant – R12 and R134a
Accumulator – cleans and stores refrigerant
Compressor – compresses and recirculates the refrigerant
Condenser – releases the heat to the outside
Orifice tube – controls flow
Evaporator – absorbs heat from the passenger cabin
Chapter 12
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Summary
The cooling system maintains efficient engine-operating temperature, removes excess heat, brings the engine up to operating temperature as quickly as possible, and provides warmth to the passenger compartment.
Antifreeze prevents the coolant from freezing, increases boiling temperature, lubricates components, and reduces corrosion.
The A/C system provides for passenger comfort during hot weather.
Chapter 12
© 2007 Rolling Hills Publishing