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Cooling System Technology

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  • Air cooling systems circulate fresh air through internal engine passages to carry away engine heat.
    False
  • ____________________cooling systems are no longer used in vehicles.
    Open
  • Typical radiator cap pressure in an automotive cooling system is ____ psi.
    7–10
    12–16
    18–20
    20–26
  • Some cooling systems can use plain water instead of antifreeze.
    False
  • Large cooling ______________________________ on the cylinder are an essential feature of air cooling systems.
    fins
  • ______________________________ cooling is often used on high-performance cars, since it can provide a more uniform engine temperature
    Reverse-flow
  • High thermostat heat ranges are used in modern vehicles to reduce exhaust emissions.
    True
  • The temperature of the combustion flames can reach ____°F.
    2600
    3200
    3900
    4500
  • The thermostat ______________________________ is the temperature at which it opens to permit coolant flow.
    rating
  • Which of the following is not a true statement about the functions of an engine cooling system?
    It provides a means of warming the passenger compartment.
    It removes engine heat.
    It maintains a proper engine operating temperature.
    It keeps the engine from reaching operating temperature too
  • Open cooling systems are no longer used on vehicles.
    True
  • Pressure in the cooling system raises the boiling point of coolant to between ______________________________°F and 260°F.
    250
  • A water pump normally mounts to the ________________________of the engine.
    Front
    top
    Center
    Side
  • A water pump ______________________________ is installed between the pump and engine to prevent coolant leakage.
    gasket
  • One of the functions of antifreeze is to lubricate the water pump.
    True
  • Antifreeze prevents rust and winter ______________________________ inside the cooling system.
    freeze up
  • A(n) ______________________________ is a small tank placed inside the vehicle's radiator to dissipate heat from transmission fluid.
    oil cooler/ transmission cooler
  • When a thermostat is closed, which of these permits coolant circulation through the engine?
    None of the above.
    Both of the above.
    Bypass valve.
    Bypass thermostat.
  • A block heater is often used on diesel engines to aid winter starting.
    True
  • A flex fan alters airflow in response to engine speed.
    True
  • The worm drive hose clamp is seldom used in cooling systems.
    False
  • For every pound of pressure increase, water's boiling point goes up about __________________ degrees F.
    1
    5
    10
    3
  • A fluid coupling fan clutch is designed to ______________________________ at higher speeds.
    slip
  • The correct coolant/antifreeze mixture for use in most vehicles is ____.
    50% antifreeze/50% water
    pure ethylene glycol
    25% antifreeze/75% water
    pure water
  • The radiator's primary function is to store engine heat.
    False
  • An electric water pump uses an impeller and a large ______________________________ motor to force coolant through the cooling system.
    dc
  • A cross-flow radiator has it tanks on the _____________________of the core.
    sides
  • Liquid cooling systems are the most common for passenger cars.
    True
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