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WorksheetsCooling Systems quiz
Total questions: 31
Worksheet time: 16mins
What is the term for the substance that forms when an engine does not reach operating temperature
Sludge
Scale
Minerals
slime
What causes coolant to boil at normal peak engine temperature?
The thermostat is defective.
The pressure cap is defective.
The cooling fan is not operating.
The mix is 40% antifreeze and 60% water.
A cooling system pressure tester installed on a cold engine reads 12 psi after five minutes of operation. The rad cap reads 12psi. What does this indicate?
Excess Pressure Buildup
Low pressure
Leaking System
System operating normal
Coolant has bubbles forming in the filler neck of a cooling system immediately after an engine starts. What is the cause?
Broken Fins on water pump
Bad head gasket
Worn thermostat
What test is performed by a cylinder of fluid and a suction bulb?
Specific Gravity
Pressure Test
Coolant Acidity
None of the above
What is indicated by white exhaust smoke from a gasoline engine?
Worn piston rings.
Internal oil leakage.
Internal coolant leakage.
Low engine compression.
What is checked first if a vehicle emits blue exhaust smoke?
Engine oil level.
Engine oil pressure.
Fire.
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
What tool is best used to check the thermostat
Pressure tester
Refractometer
Hydrometer
Infared thermometer
What Type of pump is normally used in the cooling system
Impeller
Plunger
Rotary
Gear
How much heat is removed by the cooling system
13%
33%
43%
66%
Typical Pressure caps open at
5-10PSI
12-16PSI
16-18PSI
18-24PSI
Combustion Temperature can reach ______F
4500
3500
2500
1500
1. What is a common cause of freeze or frost plug failure
Engine Vibration
Metal Fatigue
Overheating
Rusting
A vehicle that overheats while idling but not while driving could be
Stuck Thermostat
Bad Belt
Defective fan
Clogged heatercore
What is the first step when Diagnosing a bad cooling fan
Check fuses
Replace fan with a known good fan
Check for power at the fan
Supply power and ground to the fan connector pins
What type of cooler in located in the radiator
Oil
Transmission
Brake
A/c
Radiator tubes are made of
Brass
aluminum
Plastic
Aluminum or plastic
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
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 radiator is better at cooling
Downflow
Crossflow
Both are equal
Depends on the application
A customer comes in for a routine oil change. When removing the oil cap there is sludge found on the underside. The oil looks relatively clean. What is the cause
Headgasket failure
Failing to reach operating temperature while driving
Fuel in the oil
vehicle overheating
What happens when engine temperature reaches above 204C
Normal Operating condition
Oil Begins burning in the crankcase
the pump works faster
None of the above
Pressurizing a cooling system 10psi does what
Lowers the boiling point
Raises the boiling point
Destroys the seals
none of the above
What is the function of the radiator cap in a cooling system?
To increase the boiling point of the coolant
To decrease the boiling point of the coolant
To regulate the flow of coolant
To filter the coolant
What could be the cause of a coolant leak at the front of the engine?
Faulty water pump
Clogged radiator
Stuck thermostat
Defective cooling fan
What is the purpose of the heater core in a vehicle's cooling system?
To cool the engine
To heat the passenger compartment
To filter the coolant
To regulate coolant pressure
What is the primary function of a thermostat in a vehicle's cooling system?
To cool the engine
To regulate the engine temperature
To increase the coolant pressure
To filter the coolant
What is the purpose of the radiator in a vehicle's cooling system?
To cool the engine oil
To transfer heat from the coolant to the air
To increase the coolant pressure
To filter the coolant
