Chapter 21 Automotive Cooling System Quiz

Water pumps ________.

• only work at idle and low speeds and are disengaged at higher speeds

• use engine oil as a lubricant and coolant

• are driven by the engine crankshaft or camshaft

• disengage during freezing weather to prevent radiator failure

What is the purpose of the lower air dam in the front of vehicles?

• To help direct the air through the radiator

• To direct the air to the automatic transmission

• To improve the looks of the vehicle

• Both b and c

What diagnostic trouble code (DTC) could be set if the thermostat is defective?

• P0300

• P0171

• P0440

• P0128

What type of pump is a water pump?

• Positive displacement

• Centrifugal pump

• Vane-type pump

• Gear-type pump

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

• Defective upper radiator hose

• Missing spring from the upper radiator hose, which is used to keep it from collapsing

• Defective thermostat

• Defective radiator pressure cap

Which statement is true about thermostats?

• The temperature marked on the thermostat is the temperature at which the thermostat should be fully open.

• Thermostats often cause overheating.

• The temperature marked on the thermostat is the temperature at which the thermostat should start to open

• Both a and b.

Technician A says that dirty or blocked radiator can cause the engine to overheat. Technician B says that overheating can be caused by a defective water pump. Which technician is correct?

• Technician A only

• Technician B only

• Both Technicians A and B

• Neither Technician A nor B

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

• Pour the coolant into the radiator slowly.

• Use a coolant exchange machine that draws a vacuum on the system.

• Open the air bleeder valves while adding coolant.

• Either b or c.

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. Technician B says that the cooling system could be low on coolant. Which technician is correct?

• Technician A only

• Technician B only

• Both Technicians A and B

• Defective pressure cap

The normal operating temperature (coolant temperature) of an engine equipped with a 195°F thermostat is ____.

• 175° to 195°F

• 185° to 205°F

• 195° to 215°F

• 175° to 215°F