module 14

The fan clutch ____ at high speeds to reduce power loss.

slips

An electric fan can begin turning even when the ignition switch is in the off position.

True

Engine operating temperature is the temperature of the coolant as the engine operates.

True

Technician A says that the coolant recovery system is used to keep coolant in the system. Technician B says that the coolant recovery system is used to keep air in the system. Who is right?

A only

Technician A says thermostats remain closed until coolant temperature reaches the thermostat's temperature rating. Technician B says once the engine is completely warmed up, the thermostat has no effect on cooling system operation. Who is right?

A only

Which of the following is not a function of an automotive cooling system?

Slowly increases the temperature of a cold engine.

A serpentine fan belt can stretch to the point that the tensioner can no longer keep it tight.

True

Technician A says that engine-powered fans are commonly used in vehicles with transverse engines. Technician B says that some electric fans are controlled by the vehicle's computer. Who is right?

a and b

Technician A says that the thermostat will keep the engine from overheating. Technician B says that the thermostat will allow the engine to warm up quickly. Who is right?

b only

A customer complains of engine overheating. The system is full of coolant and the belt has the proper tension. Technician A says that a bad water pump could be the cause of overheating. Technician B says that retarded engine timing could cause the problem. Who is right?

both a and b

An electric engine fan fails to turn on when the engine warms up. Technician A says that the problem could be a faulty fan motor. Technician B says that the problem could be a faulty fan switch. Who is right?

both a and b

Technician A says using antifreeze in the cooling system reduces the chance of freezing in cold weather. Technician B says using antifreeze in the cooling system reduces the chance of boil over in hot weather. Who is right?

both a and b

A typical liquid-cooled automotive engine uses all the following components, except:

cooling fins

A way of getting air out of the engine block.; bleed screw Connect the engine and radiator.; hoses Raises the coolant boiling point.; pressure cap Keeps parts of the engine from overheating during warm-up.; fan Opens gradually as the engine heats up.; thermostat

k

match the names a b c x e f g h i

k

All of the following can cause engine overcooling, except:

low coolant level.

Uses centrifugal force to operate.; water pump Connect the engine and radiator.; radiator hoses May be computer controlled.; electric fan motor Relieves excess system pressure.; radiator cap Used with engine-powered fans.; fan clutch ​

m

Fan clutches are being discussed. Technician A says that a fluid coupling fan clutch reduces fan action at low engine speeds. Technician B says that a thermostatic fan clutch does not drive the fan until the engine warms up. Who is right?

maybe b only

A coolant voltage test is performed and the voltmeter reads 1.0 volts. What should the technician do next?

replace the coolant

Which of the following radiator cap components prevents the radiator hoses and radiator tanks from collapsing as the engine cools?

vacuum valve