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