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Midterm > Chapter 21 > Flashcards

Chapter 21 Flashcards

1
Q

Coolant exchange machines can perform the following functions except.

A

Filter the coolant of impurities.

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2
Q

If the warning light comes on during driving or the temperature gage goes into the red danger zone, then the coolant temperature is most likely.

A

120 degrees Celsius to 126 degrees Celsius

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3
Q

The power train control module PCM in a vehicle commands the high speed fan when the Ac refrigerant pressure exceeds

A

240 psi.

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4
Q

In series flow cooling systems, blank in the gasket, block, and head perform the function of letting out the steam

A

Bleed holes

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5
Q

The boiling temperature of the coolant will most likely increase by blank for each pound of increase in pressure

A

3 degrees Fahrenheit.

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6
Q

In blank radiators the coolant flows from one side of the radiator to the opposite side

A

Cross flow

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7
Q

The blank must allow the engine to warm up to the required operating temperature as rapidly as possible and then maintain that temperature.

A

Cooling system

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8
Q

The power train control module PCM in a vehicle commands low speed fans on under the following conditions except when the System voltage is less than

A

12 volts after the vehicle is shut off

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9
Q

Sticky hydraulic valve lifter plungers is most likely a high temperature engine problem?

A

true

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10
Q

opening of rated thermostat and its operation

A

The rated temperature of the thermostat indicates the temperature on which the thermostat starts to open.

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11
Q

water pump type

A

Water pumps are not positive displacement pumps

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12
Q

coolant recovery systems A vacuum valve allows coolant to reenter the system.

A

true

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13
Q

Technician. A stated that when the cooling system cools the pressure in the cooling system is reduced and a partial vacuum forms

A

True

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14
Q

Technician b stated the vacuum pushes the coolant from the plastic container back into the cooling system keeping the system full

A

True

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15
Q

technician a stated that he coolant is passed through tubes in the small core of the heater.

A

True

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16
Q

Technician b stated. The air is passed across the heater fins and is then sent to the passenger compartment.

A

True

17
Q

Which of the following is an appropriate precautionary measure when the coolant temperature warning light comes on?

A

The radiator cap should not be removed when the engine is hot.

18
Q

Which of the following is a common cause of overheating in an engine?

A

Broken fan drive belt.

19
Q

flusing the cooling system steps

A

When flushing the cooling system and engine should be started until reaches operating temperatures with the heater on.

20
Q

Technician a stated that when installing and checking belt tension the belt should be installed on the engine and should be operated with all the accessories turned on.

A

True

21
Q

technician b stated that when checking belt tension, a beam type torque wrench should be used to determine the torque needed to rotate the tensioner.

A

True

22
Q

What can be done to prevent air from getting in the cooling system when the coolant is replaced

A

use a Coolant exchange machine.

23
Q

The upper radiator hose collapses when the engine cools what is the most likely cause?

A

Defective radiator cap.

24
Q

Heat transfer is improved from the coolant to air when the

A

Temperature is great

25
Q

Water pumps are driven by

A

The engine crankshaft and camshaft.

26
Q

What diagnostic trouble code could be set if the thermostat is defective

A

P0128

27
Q

Technician a says that the radiator should be inspected for leaks and proper flow before installing a rebuilt engine.

A

True

28
Q

Technician b says that the engine overheats during slow city driving can only be due to a defective cooling fan.

A

True

29
Q

A customer complains that the heater works sometimes, but sometimes only cold air comes out while driving. Technician a says that the water pump is defective

A

False

30
Q

A customer complains that the heater core works sometimes, but sometimes only cold air comes out while driving. It says that the cooling system could be low on coolant

A

True

31
Q

The normal operating temperature coolant temperature of an engine equipped with 195 degrees Fahrenheit thermostat is

A

195 degrees Fahrenheit to, 215 degrees Fahrenheit.

Midterm (16 decks)

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