Question 1

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

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 2

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?

Accepted Answer

Both technicians are correct. Aluminum oxide can form if the coolant becomes too diluted with water, and the thermostat on all engines remains closed until its predetermined opening point.

Question 3

What is the coolant change interval recommended by most manufacturers?

Accepted Answer

Most vehicle manufacturers recommend that coolant be changed at least every 3 years or 30,000 miles.

Question 4

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 5

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 helps regulate the flow of coolant by either allowing or blocking the bypass route as the temperature changes.

Question 6

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?

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 7

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

Accepted Answer

The temperature bulb of a thermostat is usually installed facing the radiator to accurately determine the temperature of the engine coolant.

Question 8

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 9

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

Accepted Answer

This statement is incorrect. A 50% water and 50% antifreeze mixture is the maximum recommended mixture for most vehicles. Some vehicles may require a slightly different mixture, so it's best to check the owner's manual or consult with a mechanic.

Question 10

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

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 11

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?

Accepted Answer

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

Question 12

What instrument can determine the coolant's conductivity?

Accepted Answer

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

Question 13

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 14

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 15

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?

Accepted Answer

Neither technician is completely correct. While the lower radiator hose may be subjected to more stress due to gravitational forces, it is not necessarily the most abused. Additionally, a defective hose may not always show obvious outward signs of wear or damage, and may require further testing to determine if it needs to be replaced.

Question 16

What is another term for extended-life coolants?

Accepted Answer

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

Question 17

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?

Accepted Answer

Technician B is correct. Electric fans on some late model cars continue to run for a short period of time after the engine is shut off to cool down the engine compartment. Technician A's statement is incorrect as temperature-controlled fan clutches are usually controlled by a bi-metallic spring that expands and contracts with heat, rather than a spring that shrinks when heated.

Question 18

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?

Accepted Answer

The answer of Technician A says that for each pound...

Question 19

Water pumps are sometimes driven by the timing belt.

Accepted Answer

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

Question 20

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

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.

Quiz 14: Cooling System