Question 1

A thermostat is installed with its temperature bulb facing the radiator.

Accepted Answer

A thermostat is typically installed with its temperature bulb facing the flow of coolant, not the radiator. This allows it to accurately measure the temperature of the coolant entering the engine and adjust the flow of coolant as needed.

Question 2

Technician A says the lower radiator hose suffers the most abuse. Technician B says that a defective hose may be easily determined by outward appearance. Who is right?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

Both technicians are incorrect. The upper radiator hose typically suffers more abuse due to its proximity to the engine, and a defective hose may not always exhibit outward signs of damage. It is important to inspect hoses thoroughly, including pressurizing them, to ensure they are functioning properly.

Question 3

Technician A says water will absorb more heat than ethylene glycol. Technician B says permanent antifreeze/coolant does not evaporate. Who is right?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

Water does absorb more heat than ethylene glycol, making Technician A correct. Permanent antifreeze/coolant, while it may lose water content over time due to evaporation, the ethylene glycol (the antifreeze component) itself does not evaporate under normal conditions, making Technician B also correct.

Question 4

What instrument can determine the coolant's conductivity?
A)a voltmeter
B)a hydrometer
C)a coolant exchanger
D)a refractometer

Accepted Answer

The answer of What instrument can determine the coolant's conductivity?
A)a...

Question 5

Technician A says that for each pound of pressure on the cooling system, the boiling point raises one degree Fahrenheit. Technician B says engine rebuilders epoxy heat tabs to the cylinder heads to protect against dishonest warranty claims. Who is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

Technician B is correct. Engine rebuilders use epoxy heat tabs on cylinder heads to monitor overheating and protect against false warranty claims. Technician A's statement is incorrect; the boiling point increases by about 3 degrees Fahrenheit for each pound of pressure, not one degree.

Question 6

The jiggle pin or check valve in a thermostat helps bypass coolant as the temperature rises.

Accepted Answer

The jiggle pin or check valve in a thermostat allows a small amount of coolant to flow through the thermostat even when it is closed, which helps to prevent air pockets and ensures that the thermostat senses the coolant temperature accurately, rather than bypassing coolant as the temperature rises.

Question 7

Technician A says a temperature-controlled fan clutch is controlled by a spring that shrinks when it is heated and expands when it is cooled. Technician B says that electric fans found on many late model cars sometimes run after the engine is shut off. Who is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

Technician B is correct. Late model cars use electric fans that sometimes continue to run after the engine is shut off to cool the engine down. Technician A is incorrect because temperature-controlled fan clutches use a bimetallic spring, not a spring that shrinks when heated and expands when cooled.

Question 8

All of the following are examples of the cause of electrolysis, EXCEPT _____.
A)triazoles
B)bad ground circuit
C)chemical
D)static electricity

Accepted Answer

Triazoles are not a cause of electrolysis; they are actually used as corrosion inhibitors to protect metals from corrosion, not a cause of it. Electrolysis is typically caused by factors like bad ground circuits, chemical reactions, and static electricity, which can lead to the degradation of metals through an electrochemical process.

Question 9

What is another term for extended-life coolants?

Accepted Answer

The answer of What is another term for extended-life coolants?...

Question 10

Cavitation means air bubbles form in the coolant and then collapse.

Accepted Answer

Cavitation occurs when air bubbles form in the coolant due to pressure changes or turbulence and then collapse, leading to damage or erosion to the surface of nearby metal components.

Question 11

What coolant tester that measures specific gravity is no longer recommended by the American Society for Testing and Materials (ASTM)?

Accepted Answer

The answer of What coolant tester that measures specific gravity...

Question 12

What substance can be used to dilute coolant that has too high a concentration?

Accepted Answer

The answer of What substance can be used to dilute...

Question 13

Technician A says conventional coolants with silicate additives have a very long shelf life. Technician B says European coolants contain higher concentrations of silicates than found in North American coolants. Who is right?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

Conventional coolants with silicate additives do not necessarily have a very long shelf life; their effectiveness can diminish over time. European coolants typically have lower concentrations of silicates compared to North American coolants, as European manufacturers often prefer formulations with organic acid technology (OAT) or hybrid OAT (HOAT) coolants, which have different additive packages.

Question 14

Technician A says coolant is disposed of as hazardous waste. Technician B says ethylene glycol is flammable at room temperature. Who is right?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

Technician A is correct. Coolant is considered hazardous waste and must be disposed of properly according to environmental regulations. Technician B is incorrect. Ethylene glycol is not flammable at room temperature, but it is highly toxic if ingested.

Question 15

A 30% water and 70% antifreeze is the maximum mixture that should be used.

Accepted Answer

The given statement indicates that a mixture of 30% water and 70% antifreeze is the maximum that should be used, implying that it is the most concentrated mixture allowed.

Question 16

If a flushing procedure is not entirely effective in correcting an engine with thermoplastic seizure, what must be done?

Accepted Answer

The answer of If a flushing procedure is not entirely...

Question 17

Technician A says borax included in an SCA package is a buffer and acid neutralizer. Technician B says phosphate is added to antifreeze to protect aluminum parts in the cooling system. Who is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

The answer of Technician A says borax included in an...

Question 18

What is the coolant change interval recommended by most manufacturers?

Accepted Answer

The answer of What is the coolant change interval recommended...

Question 19

Technician A says aluminum oxide forms if the coolant becomes too diluted with water. Technician B says the thermostat on all engines remains closed until its predetermined opening point. Who is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Accepted Answer

Technician A is correct; if the coolant becomes too diluted with water, aluminum oxide can form. Technician B is also correct; the thermostat on all engines remains closed until its predetermined opening point. Therefore, both technicians are correct.

Question 20

Water pumps are sometimes driven by the timing belt.

Accepted Answer

In some vehicles, the water pump is driven by the timing belt.

Quiz 14: Cooling System

A thermostat is installed with its temperature bulb facing the radiator.

Technician A says the lower radiator hose suffers the most abuse. Technician B says that a defective hose may be easily determined by outward appearance. Who is right?

Technician A says water will absorb more heat than ethylene glycol. Technician B says permanent antifreeze/coolant does not evaporate. Who is right?

What instrument can determine the coolant's conductivity?

Technician A says that for each pound of pressure on the cooling system, the boiling point raises one degree Fahrenheit. Technician B says engine rebuilders epoxy heat tabs to the cylinder heads to protect against dishonest warranty claims. Who is correct?

The jiggle pin or check valve in a thermostat helps bypass coolant as the temperature rises.

Technician A says a temperature-controlled fan clutch is controlled by a spring that shrinks when it is heated and expands when it is cooled. Technician B says that electric fans found on many late model cars sometimes run after the engine is shut off. Who is correct?

All of the following are examples of the cause of electrolysis, EXCEPT _____.

What is another term for extended-life coolants?

Cavitation means air bubbles form in the coolant and then collapse.

What coolant tester that measures specific gravity is no longer recommended by the American Society for Testing and Materials (ASTM)?

What substance can be used to dilute coolant that has too high a concentration?

Technician A says conventional coolants with silicate additives have a very long shelf life. Technician B says European coolants contain higher concentrations of silicates than found in North American coolants. Who is right?

Technician A says coolant is disposed of as hazardous waste. Technician B says ethylene glycol is flammable at room temperature. Who is right?

A 30% water and 70% antifreeze is the maximum mixture that should be used.

If a flushing procedure is not entirely effective in correcting an engine with thermoplastic seizure, what must be done?

Technician A says borax included in an SCA package is a buffer and acid neutralizer. Technician B says phosphate is added to antifreeze to protect aluminum parts in the cooling system. Who is correct?

What is the coolant change interval recommended by most manufacturers?

Technician A says aluminum oxide forms if the coolant becomes too diluted with water. Technician B says the thermostat on all engines remains closed until its predetermined opening point. Who is correct?

Water pumps are sometimes driven by the timing belt.