Question 1

Technician A says that in a conventional flow cooling system, coolant leaves the engine through the top radiator hose. Technician B says that if cold water is added to a hot cooling system, the coolant pump could start to leak. Who is right?

Accepted Answer

Technician A is correct because in a conventional flow cooling system, the hot coolant exits the engine through the top radiator hose and moves to the radiator to be cooled. Technician B is also correct because adding cold water to a hot cooling system can cause thermal shock, leading to rapid contraction of metal parts, which might cause the coolant pump seals to fail and start leaking.

Question 2

Two technicians are attempting to locate a leak by using a pressure tester on the radiator. Technician A says to use a mirror and flashlight to locate a leak if the location cannot be seen. Technician B says to run the engine when performing the test. Who is right?

Accepted Answer

Technician A is correct in suggesting the use of a mirror and flashlight to locate a leak if the location cannot be seen. Technician B is incorrect in suggesting to run the engine when performing the test as it can be dangerous and may cause injury.

Question 3

A transmission heat exchanger has failed. Technician A says that if the engine is running, oil will flow from the transmission to the radiator. Technician B says that when the engine is off, coolant will flow into the transmission. Who is right?

Accepted Answer

When the engine is running, the transmission fluid is pumped through the transmission cooler, which is located in the radiator. If the transmission heat exchanger fails, the transmission fluid will leak into the radiator and mix with the coolant. When the engine is off, the coolant will flow into the transmission through the failed heat exchanger.

Question 4

Technician A says that older radiator cores are made of copper and brass. Technician B says that newer radiator cores are usually made of aluminum and have plastic tanks. Who is right?

Accepted Answer

Both technicians are correct. Older radiator cores were typically made of copper and brass, while newer ones are usually made of aluminum and have plastic tanks.

Question 5

Technician A says that when replacing a thermostat the temperature sensing bulb faces out of the block. Technician B says that engines with aluminum heads should use antifreeze with special (silicate) additives. Who is right?

Accepted Answer

The answer of Technician A says that when replacing a...

Quiz 14: Cooling System

Technician A says that in a conventional flow cooling system, coolant leaves the engine through the top radiator hose. Technician B says that if cold water is added to a hot cooling system, the coolant pump could start to leak. Who is right?

Two technicians are attempting to locate a leak by using a pressure tester on the radiator. Technician A says to use a mirror and flashlight to locate a leak if the location cannot be seen. Technician B says to run the engine when performing the test. Who is right?

A transmission heat exchanger has failed. Technician A says that if the engine is running, oil will flow from the transmission to the radiator. Technician B says that when the engine is off, coolant will flow into the transmission. Who is right?

Technician A says that older radiator cores are made of copper and brass. Technician B says that newer radiator cores are usually made of aluminum and have plastic tanks. Who is right?

Technician A says that when replacing a thermostat the temperature sensing bulb faces out of the block. Technician B says that engines with aluminum heads should use antifreeze with special (silicate) additives. Who is right?