Thermostats

What are the two common failures of thermostats?

• Getting stuck in the open position and causing overheating

• Getting stuck in the closed position and causing overheating

• Getting stuck in the open position and causing lack of heat

• Getting stuck in the closed position and causing lack of heat

Why is it not recommended to remove the thermostat from a vehicle?

• It can cause unregulated coolant flow and fluctuating engine temperature

• It can cause fuel economy problems

• It can cause problems with the engine management system

• All of the above

What is the purpose of the air bleed valve in a thermostat?

• To allow air to circulate through the radiator when the thermostat is closed

• To prevent air from entering the cooling system

• To regulate the flow of coolant through the engine block

• To regulate the flow of coolant through the radiator

What is the function of the spring in a thermostat?

• To keep the valve closed

• To open the valve when the temperature reaches a certain point

• To regulate the flow of coolant through the bypass

• To regulate the flow of coolant through the radiator

What causes the thermostat to open?

• Expansion of a charge inside the thermostat

• Increase in coolant temperature

• Decrease in coolant temperature

• Increase in engine RPM

What is the purpose of the bypass in a cooling system?

• To allow coolant to circulate through the engine block when the thermostat is closed

• To allow coolant to bypass the radiator when the thermostat is closed

• To regulate the flow of coolant through the heater core

• To regulate the flow of coolant through the radiator

Why is it important for the input hose of the heater core to be positioned behind the thermostat?

• To ensure quick circulation of coolant through the heater core

• To prevent air from entering the heater core

• To regulate the flow of coolant through the heater core

• To prevent overheating of the heater core

What is the recommended mixture of coolant and water in a cooling system?

• 100% coolant

• 100% water

• 50% coolant and 50% water

• 75% coolant and 25% water

What is the purpose of a radiator cap?

• To regulate the flow of coolant through the radiator

• To increase the boiling point of the coolant

• To prevent air from entering the cooling system

• To regulate the pressure in the cooling system

What is the boiling point of water in a cooling system with a 15 pound radiator cap?

• 212 degrees Fahrenheit

• 242 degrees Fahrenheit

• 227 degrees Fahrenheit

• 257 degrees Fahrenheit