Ch. 21 Cooling System "Test" Auto Tech
Coolant exchange machines can perform the following functions, except ________
Filter the coolant of impurities
The water pump uses which of these reactionary forces actions to circulate the coolant?
Centrifugal force
What can be done to prevent air from getting trapped in the cooling system when the coolant is replaced?
-Open the air bleeder valves while adding coolant. -Use a coolant exchange machine that draws a vacuum on the system.
In this drawing of a radiator cap, what is occurring within the cooling system?
-The system is cooling down -Coolant is returning to the radiator
What failed component(s) could cause coolant to be found in the engine oil?
-defective radiator/oil cooler -blown head gasket
A compression test is used to:
-verify the mechanical condition of a cylinder in an engine -locate a cylinder or cylinders with low compression -test the compression stroke pressure for each cylinder
For every one PSI increase in cooling system pressure, the coolant's boiling point is raised how many degrees F?
3
The correct mixture for engine coolant is?
50/50
The upper radiator hose collapses when the engine cools. What is the most likely cause?
A defective pressure cap
Technician A says that cooling fans are designed to draw air through the radiator to aid in the heat transfer process. Technician B says that drawing the heat from the coolant transfers this heat to the outside air through the radiator. Who is right?
Both Techs A and B
The ________ must allow the engine to warm up to the required operating temperature as rapidly as possible and then maintain that temperature.
Cooling System
All of the following are causes of overheating in an engine except?
High engine oil level
Pressurizing the automotive cooling system results in ________.
Increased coolant boiling point
Heat transfer is improved from the coolant to the air when the ________.
Temperature difference is great
Electric cooling fans are typically commanded on and off by the ________.
Powertrain control module (PCM)
If a cooling system operates at too cool of a temperature, the engine will ________.
Produce higher emissions
Which component is used to transfer coolant heat to the outside air?
Radiator
Technician A says that the purpose and function of the cooling system is to maintain proper engine operating temperature. Technician B says that the water pump controls engine coolant temperature by opening at its rated opening temperature to allow coolant to flow through the radiator. Who is right?
Tech A only
Two technicians are discussing blow head gaskets. Technician A says that you should check for the presence of fuel in the cooling system. Technician B says if their is coolant in the oil you have a blown head gasket. Who is right?
Tech A only
The coolant flow through the radiator is controlled by the ________.
Thermostat
Which component is used to circulate coolant through the engine?
Water Pump
All of the following are true statements about the Cooling System function except?
it keeps the engine from reaching operating temperature too quickly