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7. Vehicle Components

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140
The Cooling System

The heat caused by the friction of moving engine parts and the explosion of gasoline in the cylinders is removed through the vehicle's cooling system. In this system:

  • Heat is absorbed by coolant, a mixture of water and chemicals that protect the cooling system from corrosion, lubricate the water pump, and prevent freezing.
  • Coolant is largely stored in the radiator. The main purpose of the radiator is to transfer the heat from the coolant to the outside air while it is being circulated by the water pump.
  • The radiator is cooled by the radiator fan and air flowing through it as you drive.
  • Most radiators have a recovery tank that captures coolant as it expands from heat and returns it to the radiator when it cools.

  • To allow your engine to quickly heat up to the proper running temperature, the flow of coolant is controlled by heat sensing valve called a thermostat


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    Lesson Summary


      

    Lesson 7 Quiz


    You will now answer 5 questions to test what you learned during this lesson. You must answer all questions correctly to receive completion credit for this lesson. You may answer the questions as many times as necessary to get them right.

    You should review the lesson material if you don't do well on the quiz.

    1. The ALTERNATOR:


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    2. Disc brakes work by:


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    3. The engine in your car is sometimes called:


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    4. The minimum tread thickness for passenger car tires is:


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    5. The oil warning light means that:


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