Chapter 21

Question 1

Coolant exchange machines can perform the following functions except.

Answer 1

Filter the coolant of impurities.

Question 2

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.

Answer 2

120 degrees Celsius to 126 degrees Celsius

Question 3

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

Answer 3

240 psi.

Question 4

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

Answer 4

Bleed holes

Question 5

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

Answer 5

3 degrees Fahrenheit.

Question 6

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

Answer 6

Cross flow

Question 7

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

Answer 7

Cooling system

Question 8

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

Answer 8

12 volts after the vehicle is shut off

Question 9

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

Answer 9

true

Question 10

opening of rated thermostat and its operation

Answer 10

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

Question 11

water pump type

Answer 11

Water pumps are not positive displacement pumps

Question 12

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

Answer 12

true

Question 13

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

Answer 13

True

Question 14

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

Answer 14

True

Question 15

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

Answer 15

True

Question 16

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

Answer 16

True

Question 17

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

Answer 17

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

Question 18

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

Answer 18

Broken fan drive belt.

Question 19

flusing the cooling system steps

Answer 19

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

Question 20

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.

Answer 20

True

Question 21

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.

Answer 21

True

Question 22

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

Answer 22

use a Coolant exchange machine.

Question 23

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

Answer 23

Defective radiator cap.

Question 24

Heat transfer is improved from the coolant to air when the

Answer 24

Temperature is great

Question 25

Water pumps are driven by

Answer 25

The engine crankshaft and camshaft.

Question 26

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

Answer 26

P0128

Question 27

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

Answer 27

True

Question 28

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

Answer 28

True

Question 29

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

Answer 29

False

Question 30

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

Answer 30

True

Question 31

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

Answer 31

195 degrees Fahrenheit to, 215 degrees Fahrenheit.