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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 f lowing through passages inside the engine
  • the coolant is a mixture of water and chemicals that protect the cooling system from corrosion, lubricate the water pump , and prevent freezing
  • the coolant is largely stored in the radiator whose main purpose is to transfer the heat from the coolant to the outside environment (air) while it is being circulated by the water pump
  • the radiator is cooled by air flowing through it as you drive and by the radiator fan
  • most radiators have a recovery tank which is used to capture coolant as it expands due to heat and return it to the radiator when it cools
  • that in order to allow your engine to quickly heat up to proper running temperature, the flow of coolant is controlled by heat sensing valve called a thermostat

  • Click on pictures to see full-size image


    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. Disc brakes work by:


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    2. The engine in your car is sometimes called:


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    3. This oil warning light means that:


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


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    5. The ALTERNATOR:


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