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Purpose of theCooling system

Control temperature ofhot combustion.

4000 degree temps. couldseriously damage engineparts.

Provide Heat for passengerCompartment

Cool Trans fluid & Oil Heat moves from warm to

cold

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Cooling System TypesAir Cooling

Oil CoolingLiquid or

Water Cooled

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Cooling System Parts

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Water Jackets Surrounds thecylinders with waterpassage.

Absorbs heat fromthe cylinder wall.

Pump move water to

radiator where heatis exchanged to theair.

http://www.howstuffworks.com/cooling-system2.htmhttp://www.howstuffworks.com/cooling-system2.htm

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Water Pump Non-positive

displacement pump

which circulatescoolant around coolingsystem.

Simple impeller design.

Usually driven by drivebelt from crankshaft.

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Water Pump Leakage

Weep hole

Noise

bearing

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Radiators

A radiator is a heatexchanger.

Tube and fin stylethe most popular.

Made of copper andbrass or aluminum

and plastic. 3 (radiator,

evaporator, heatercore)

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Radiator Types Two types of

radiatorconstruction.

Down-flow older

Cross-flow Aerodynamic

Lower hoodlines

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Radiator Fans Keeps air moving

through the radiatorwhen the car is notmoving.

Several types:

rigid,

flex (not used much

anymore), viscous clutch and

electric.

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Thermostat

Controls coolanttemperature.

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 andengine insides.

If it fails closed: look out!

It creates pressure in theengine well beyond normallimits. Many types ofdamage may occur.

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Radiator Cap The cap allows access to

the cooling system forfilling and testing.

The cap has two valves: apressure relief valve set ataround 15 PSI and avacuum valve which isneeded when the engine

cools down.

Raises boiling point offluid

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 tothe recovery tank.

When the engine coolant the

coolant contracts and creates avacuum 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 theradiator. 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 passengercompartment.

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 mostcommon. (its green)

Dexcool (its 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 9.810.5

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Radiator Hoses & Heater Hoses The upper and lower radiator hoses

direct the fluid from the engine to theradiator and back.

Radiator hoses are a special part foreach car.

Radiator

Heater

Bypass

Heater hoses do the same for theheater core.

Heater hoses are generic and come in,5/8, and 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 systemflushing

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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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WinterizeTerm 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 Fillmachine.

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