MATChapter_39CoolSysFund

7/27/2019 MATChapter_39CoolSysFund

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Modern AutomotiveModern Automotive Technology TechnologyChapter 39Chapter 39

Cooling System

Fundamentals



Chapter 39Chapter 39Cooling SystemCooling System FundamentalsFundamentals

Learning ObjectivesLearning Objectivesz

Summarize the functions of a coolingsystemz Explain the operation and construction of

major cooling system parts and assembliesz Compare cooling system designsz Explain the importance of antifreezez Discuss safety procedures when working on

a cooling system




zz

A 50/50 mixture of A 50/50 mixture of antifreeze and water antifreeze and water protects the cooling protects the cooling

system tosystem to – – 34F34F °°zz The radiator capThe radiator cap

usually maintains 12usually maintains 12 --16 PSI, raising the16 PSI, raising the

boiling point of boiling point of coolant to 250coolant to 250 --260260 FF°°




1. Coolant is forced through the engine1. Coolant is forced through the engineand other system parts by the WATERand other system parts by the WATERPUMPPUMP

2.2. The RADIATOR transfers engine The RADIATOR transfers enginecoolant heat to outside aircoolant heat to outside air




zz The basic parts of aThe basic parts of acooling system are:cooling system are:

zz Water PumpWater Pumpzz Radiator HosesRadiator Hoseszz Radiator Radiator zz

Cooling FanCooling Fanzz ThermostatThermostatzz Radiator CapRadiator Cap





Chapter 39Chapter 39Cooling SystemCooling System FundamentalsFundamentalsA: When the coolant isA: When the coolant is

cold, the thermostat stayscold, the thermostat staysclosed due to springclosed due to springtensiontension — — the water the water

pump circulates coolant pump circulates coolantin the engine, but notin the engine, but notthrough the radiator through the radiator

B: When the coolant is hotB: When the coolant is hotthe thermostats opens,the thermostats opens,allowing coolant to passallowing coolant to pass

through the radiator through the radiator




5. The BYPASS VALVE permits coolant5. The BYPASS VALVE permits coolantcirculation through the engine when thecirculation through the engine when thethermostat is closedthermostat is closed

6. The fan or THERMO SWITCH is a6. The fan or THERMO SWITCH is atemperature sensitive switch thattemperature sensitive switch that

controls fan motor operation.controls fan motor operation.




A.A.

Inlet from Radiator Inlet from Radiator B.B. Sealed BearingsSealed BearingsC.C. Fan HubFan HubD.D. Pump ShaftPump ShaftE.E. HousingHousing

F.F. Impeller Impeller G.G. Outlet to Water Outlet to Water

JacketsJackets




7. The engine is connected to the radiator7. The engine is connected to the radiatorby the RADIATOR HOSESby the RADIATOR HOSES8. The FAN draws air through the radiator8. The FAN draws air through the radiator




zz A molded hose isA molded hose ismanufactured in amanufactured in aspecial shape, withspecial shape, with

bends to clear other bends to clear other engine or coolingengine or coolingsystem partssystem parts

zz A flexible hose has anA flexible hose has anaccordian shape and accordian shape and can be bent intocan be bent intodifferent anglesdifferent angles




9. A disc with fan9. A disc with fan --like blades inside thelike blades inside thewater pump that spins and produceswater pump that spins and producespressure and flow is known as thepressure and flow is known as theWATER PUMP IMPELLERWATER PUMP IMPELLER

10. The center section of the radiator10. The center section of the radiator

made up of tubes and cooling fins ismade up of tubes and cooling fins iscalled the COREcalled the CORE







z

The cooling system quickly increase thetemperature of a cold engine, removesexcess heat from the engine and maintains

constant engine temperaturez Never remove the radiator cap until the

engine cools downz Used coolant must be removed by a

certified recycling company, and never

poured down the drain



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MATChapter_39CoolSysFund