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WorksheetsCooling Systems Quiz Level 2
Total questions: 32
Worksheet time: 25mins
What is the primary purpose of the coolant recovery system?
To increase the engine temperature
To recover coolant that might be lost during normal operation and heat soak
To decrease the engine temperature
To increase the pressure in the radiator
What occurs just after an engine that has been running at normal operating temperature is shut off?
Cold soak
Heat soak
Pressure drop
Coolant evaporation
What happens to the coolant temperature during heat soak?
It decreases rapidly
It remains constant
It increases rapidly
It evaporates
What is the function of the vacuum valve in the radiator cap?
To increase pressure
To release coolant
To draw coolant from the overflow tank into the radiator
To stop coolant flow
What is the function of the lower sealing gasket in the radiator cap?
To increase the engine's temperature.
To seal the radiator cap to the top of the radiator filler neck.
To reduce the coolant pressure.
To allow coolant to evaporate.
What is the boiling point of a 44% antifreeze solution at 16 PSI?
265°F
257°F
245°F
234°F
What drives the pulley attached to the impeller shaft hub in most vehicles?
Timing belt
Serpentine belt
Chain drive
Electric motor
What is the primary purpose of the thermostat in an engine?
To increase engine power
To regulate the coolant temperature
To control fuel injection
To monitor oil levels
What happens when the engine is cold in relation to the thermostat?
The thermostat opens
The thermostat closes
The thermostat regulates fuel flow
The thermostat increases engine speed
What happens to the thermostat as the coolant heats up to operating temperature?
It closes
It opens
It regulates fuel flow
It increases engine speed
What is located in the center of the thermostat?
A wax and powdered metal pellet
A rubber gasket
A metal spring
A plastic valve
What type of fans are used in many late-model applications?
Belt-driven fans.
Electrically-driven fans.
Water pump fans.
Manual fans.
What is another name for a variable pitch fan?
A fixed fan.
A flexible or flex fan.
A rigid fan.
A constant pitch fan.
What is the purpose of the expansion tank in a cooling system?
To eliminate wasteful discharge of coolant to the atmosphere
To store excess coolant when the engine is hot
To decrease the pressure in the cooling system
To increase the pressure in the cooling system
What is the advantage of using V-belts to drive cooling fans and water pumps?
They do not require lubrication and are quiet in operation
They have a poor performance record
They are noisy in operation
They require lubrication
What is the purpose of the jiggle pin in a wax thermostat?
To release excess pressure from the cooling system
To allow air to bleed from the system
To regulate the flow of coolant through the engine
To open and close the thermostat valve
What is the purpose of the radiator pressure cap in a cooling system?
To increase the boiling point of the coolant
To decrease the boiling point of the coolant
To control the flow of coolant through the engine
To regulate the temperature of the coolant
Overheating an engine can cause serious damage. One technology called fail-safe cooling
allows you to drive the vehicle if it begins to overheat. How does it work?
It deactivates alternating cylinders in the engine, pumping in air to cool them.
It transfers cool air from the air conditioning system and injects it into the radiator.
Coolant is injected directly into the cylinders.
Oil is pumped into the cylinders.
Where is the radiator tank located on a cross flow radiator?
top and bottom of the radaitor
the sides of the radiator
in the trunk
on the cylinder head
Every 1 psi increase in cooling system operating pressure will increase the cooling system’s boiling point by ____ºF.
1
2
3
4
What cooling system part will heat the passenger compartment?
Cabin Air Filter
Evaporator
Heater Core
Thermostat
What is the purpose of the radiator cap?
Helps maintain pressure on the cooling system
Lowers the boiling point of the coolant
Cools the coolant
None of the above
What is the function of the water pump in a cooling system?
To circulate the coolant around the engine
To build up pressure in the cooling system
To control the flow of coolant through the radiator
To regulate the temperature of the coolant
What is the purpose of the jiggle pin in a wax thermostat?
To release excess pressure from the cooling system
To allow air to bleed from the system
To regulate the flow of coolant through the engine
To open and close the thermostat valve
1. What is a common cause of freeze or frost plug failure
Engine Vibration
Metal Fatigue
Overheating
Rusting
What is caused by a stuck closed Thermostat
Engine Overheating at all times
Engine overheating while driving
No heat to the passenger compartment
Engine never reaches operating Temperature
What controls the cooling fan
A bimetalic strip
A temperature sensitive sensor
The ECM
All the above
A vehicle comes in running rough. The coolant temperature sensor is reading at -40C the likely cause is
Sensor is shorted
The sensor is open
The Engine is frozen
Low coolant level
What is shown by a combustion leakage test
Coolant in the oil
Oil in the coolant
Exhaust smoke in the coolant
Coolant in the exhaust
A vehicle that overheats while idling but not while driving could be
Stuck Thermostat
Bad Belt
Defective fan
Clogged heatercore
Typical Pressure caps open at
5-10PSI
12-16PSI
16-18PSI
18-24PSI
An engine That never fully reaches operating temperature is usually caused by
Stuck open Thermostat
Stuck closed thermostat
Thermostat that is rated at a much higher operating pressure
Broken fins in the pump
