1 AUTOMOTIVE COOLING SYSTEMS. 2 Purpose of the Cooling system Control temperature of hot combustion....
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Transcript of 1 AUTOMOTIVE COOLING SYSTEMS. 2 Purpose of the Cooling system Control temperature of hot combustion....
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AUTOMOTIVE COOLING SYSTEMS
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Purpose of the Cooling system
Control temperature of hot combustion.
4000 degree temps. could seriously damage engine parts.
Provide Heat for passenger Compartment
Cool Trans fluid & Oil Heat moves from warm
to cold
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Cooling System Types
Air Cooling Oil Cooling Liquid or
Water Cooled
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Cooling System Parts
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Water Jackets Surrounds the
cylinders with water passage.
Absorbs heat from the cylinder wall.
Pump move water to radiator where heat is exchanged to the air.
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Water Pump Non-positive
displacement pump which circulates coolant around cooling system.
Simple impeller design.
Usually driven by drive belt from crankshaft.
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Water Pump Leakage
Weep hole
Noise bearing
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Radiators A radiator is a
heat exchanger. Tube and fin style
the most popular. Made of copper
and brass or aluminum and plastic.
3 (radiator, evaporator, heater core)
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Radiator Types Two types of
radiator construction.
Down-flow older
Cross-flow Aerodynamic Lower hood
lines
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Radiator Fans Keeps air moving
through the radiator when the car is not moving.
Several types: rigid, flex (not used much
anymore), viscous clutch and electric.
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Thermostat Controls coolant
temperature. Uses a temperature
sensor and a valve. Usually opens around
195 degrees F.
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Thermostat Failure If it fails in the open
position engine runs cold. No heat, poor gas mileage, gunks up motor oil and engine insides.
If it fails closed: look out! It creates pressure in the engine well beyond normal limits. Many types of damage may occur.
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Radiator Cap The cap allows access to
the cooling system for filling and testing.
The cap has two valves: a pressure relief valve set at around 15 PSI and a vacuum valve which is needed when the engine cools down.
Raises boiling point of fluid
Able to take on more heat
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Coolant Recovery Tank Keeps the coolant level full in
the system at all times. Works in conjunction with the
radiator cap. When the engine heats up the
coolant expands and flows to the recovery tank.
When the engine coolant the coolant contracts and creates a vacuum and draws the fluid back into the radiator.
Reduces air in system Reduces rust Less need to open radiator
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Coolant Temperature Sensor (CTS) Reports to computer Gauges Location
Block Head Radiator tank
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Fan Shroud
Causes the air to be channeled through the radiator. Making the radiator more efficient.
Also provides safety from the spinning fan blades.
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Heater The hot water in the
cooling system is used warm the passenger compartment.
A small radiator called a heater core is located in the dash area.
Heater hoses direct the hot water to and from it.
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Heating System
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Coolant Several types of anti-
freeze available. Ethylene glycol most
common. (it’s green) Dexcool (it’s orange
and lasts 5 years) Propylene glycol
(non-toxic)
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Coolant 50/50 mix Freeze protection -84 F Overheat protection 276 F Corrosion PH test 9.8 – 10.5
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Radiator Hoses & Heater Hoses The upper and lower radiator hoses
direct the fluid from the engine to the radiator and back.
Radiator hoses are a special part for each car. Radiator Heater Bypass
Heater hoses do the same for the heater core.
Heater hoses are generic and come in ½”,5/8”, and ¾” diameter sizes.
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Drive Belts V-Belts Serpentine Belts
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Alternative uses Cool oil Cool transmission fluid
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Cooling System Service System inspection
Winterization Cooling system
flushing
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Cooling System Inspection Check coolant level. Check anti-freeze
protection. Check coolant
condition. Check coolant pH. Leak check system. Check radiator cap.
Check belt tension. Check belt condition. Check hose condition. Blow out radiator fins. Check thermostat. Check radiator fan. Check water pump.
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Winterize Term used by repair industry. It usually
means a cooling inspection plus a coolant flush.
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Cooling System Flushing Manual drain and
refill. Flushing using the
Flush and Fill machine.
Flush & Fill w/ Tee Recycling coolant.
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Replacing a Water Pump Drain cooling system Remove hoses Remove pump & GASKET Install new pump and gasket attach hoses and belts Refill and check system