Uploaded by Izaiah Sifuentes (Student WHS)

Automobile Engine Cooling System (2)

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Automobile Engine Cooling System
An overview of the parts, functions, repairs, and service
of an automobile engine cooling system.
At the end of this presentation,
you will be asked a series of
questions to see how much you
remember
Automotive Engine Cooling System and Parts
The engine cooling system is
vital for maintaining the optimal
temperature of an automobile
engine.
It prevents the engine from
overheating, which can cause
damage and lead to
breakdowns.
Understanding the parts and
functions of the cooling system is
essential for diagnosing issues and
performing necessary repairs.
Components of the Cooling System
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Radiator: The radiator cools down the coolant by dissipating heat
through the fins.
Water Pump: The water pump circulates the coolant throughout the
engine and radiator.
Thermostat: The thermostat regulates the coolant flow and controls the
engine temperature.
Radiator Cooling Fan: The fan helps cool the radiator by blowing air
over it.
Coolant: The coolant absorbs heat from the engine and cools it down.
Hoses: Carry the engine coolant from place to place
Recovery/Expansion Tank: Tank for holding coolant as it heats and
expands
Coolant
“Coolant” is a 50/50 mix of water and antifreeze.The
coolant absorbs heat from the engine and cools it down. No
coolant or low coolant level could cause the engine to
overheat. Check regularly.
Radiator Hoses; Upper and Lower
Carry the hot and cooled engine coolant to and from the engine
through the water pump and radiator. Check regularly, leaky hoses
could cause the engine to overheat.
Radiator
● The radiator cools down the coolant by dissipating heat through the
fins. This, and the hoses are the most visible parts of the system.
Check regularly, clogged fins or a damaged, leaky radiator could
cause the engine to overheat.
Radiator pressure cap
The cooling system is under pressure at operating temperature and we use a
pressurized cap to stabilize the temperature and raise the boiling point of the
coolant mixture. It is a closed system and requires a pressurized cap to keep all
the coolant inside the system.
Coolant Reservoir or Overflow Tank/Expansion
tank/Recovery Tank
All designed to safely expand the capability of the
pressurized system when it might get a little too hot,
overfilled, or simply need more room for expansion.
Expansion tanks have a pressure cap directly on
them.
Overflow or reservoir cans just have a regular plastic
cap that is not under pressure.
Water Pump:
The water pump circulates the coolant
throughout the engine and radiator.
Thermostat
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The thermostat regulates the
coolant flow and controls the
engine temperature.
Radiator Fan
The fan helps in cooling the radiator by blowing air over it,
or pulling air through it.
Heater Core/Heater hoses/Heater valve
Engine coolant (usually warm) is sent to a smaller radiator called a heater core. The warm engine
coolant warms it up and a small fan is used to blow air over it which gets hot and comes out of the
vents in your car. The flow to the heater core is controlled by a valve connected to the heater controls
in your car also.
Radiator Fan Switch and Fan Clutch
The Radiator Fan Switch is used in vehicles that use an
electric fan, it can be a manual switch or an automatic switch
which would activate the fan at a certain temperature (most
newer cars)
A toggle switch can also be used in a custom application
A Fan Clutch is a mechanical connection between
the engine and a fan blade that could engage or
disengage from the fan based on underhood
temperatures.
Cooling System Functions
Preventing Overheating: By
removing excess heat, it prevents
the engine from overheating.
Maintaining Optimal Temperature: The
cooling system keeps the engine at an
ideal operating temperature.
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Heat Dissipation: It dissipates
the excess heat generated by
the engine.
Preventing Freezing: In cold
conditions, the system prevents the
coolant from freezing and damaging
the engine.
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Lubrication: The coolant lubricates various
components, reducing friction, corrosion,
and wear.
Common Repairs and Services
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Coolant Flush: Regular flushing and replacement of coolant help maintain
system performance.
Thermostat Replacement: A faulty thermostat can cause temperature
imbalances and should be replaced.
Water Pump Replacement: A worn out water pump can result in coolant
leakage and inadequate circulation.
Radiator Repair: Radiators may develop leaks or clogs and require repair or
replacement.
Fan Replacement: A malfunctioning fan can lead to insufficient cooling and
engine overheating.
Diagnosing Cooling System Issues
Unusual Noises: Strange noises
from the cooling system may
indicate a faulty component, such
as a fan or water pump.
Coolant Leaks: Visible coolant leaks may
indicate a damaged hose, radiator, or
water pump.
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05
Coolant Discoloration: Discolored or
contaminated coolant may suggest
internal engine issues.
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Low Coolant Level: A low coolant
level can cause inadequate
cooling and lead to overheating.
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Engine Overheating: If the engine
temperature rises above normal,
there may be an issue with the
cooling system.
Exit ticket questions; please close your chromebooks and
take out a sheet of scratch paper. I suggest ripping a piece
of paper in half and sharing.
1. Name one part of the engine cooling system.
2. What does the part you named in number 1 actually do?
3. Name one issue that could cause your car to overheat.
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