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COOLING AND COMFORT HEATING SYSTEMS PowerPoint PPT Presentation


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COOLING AND COMFORT HEATING SYSTEMS. CHAPTER 3 Page 54 Classroom Manual Page 56 Lab Manual. Pg... 44C. ENGINE HEAT. Normal operation produces heat that must be carried away by coolant Accomplished by Conduction, Convection and Radiation Coolant transfers heat to less hot outside air.

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COOLING AND COMFORT HEATING SYSTEMS

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Cooling and comfort heating systems

COOLING AND COMFORT HEATING SYSTEMS

CHAPTER 3

Page 54 Classroom Manual

Page 56 Lab Manual


Engine heat

Pg... 44C

ENGINE HEAT

  • Normal operation produces heat that must be carried away by coolant

  • Accomplished by Conduction, Convection and Radiation

  • Coolant transfers heat to less hot outside air.

  • Coolant does not change state as with A/C


Cooling system operation

COOLING SYSTEM OPERATION

  • System design removes 35% of total heat

  • If not equipped with factory A/C, cooling system usually not able to handle additional heat load

  • Uses Radiator to transfer heat. Most radiators about 28-35 sq. feet.


Components

COMPONENTS

  • 5 COOLING SYSTEM COMPONENTS

    • Water Pump

    • Cooling Fan

    • Radiator

    • Pressure Cap

    • Thermostat


Radiators

RADIATORS

  • Two Types Pg. 47C

    • Vertical Flow Tubular Construction

    • Cross Flow Cellular Construction

  • PRESSURE CAPS

    • Equipped with Vacuum and Pressure Valve

    • Used to raise Pressure in system

  • Radiator Diagnosis

  • Radiator Repair

Pg... 226C

Pg... 269L


Water pumps

WATER PUMPS

Pg... 229C

Pg... 271L

  • Centrifugal Type Water Pump

  • Inlet comes from bottom of Radiator

  • Outlet is through impeller to engine

  • Allows circulation when thermostat is closed

  • Water Pump Replacement is usually due to leaks

  • Transfer pump parts and use correct gaskets


Pulleys and belts

Pg... 233& 234C

PULLEYS AND BELTS

  • Pitch and Width must be correct

  • Tension belt in foot pounds

  • Serpentine Belts and Diagrams

  • Some water pumps turn in opposite direction


Thermostats

THERMOSTATS

  • Senses coolant temperature and regulates temperature

  • Part of cooling system design

  • Temperature should not be changed

  • Stat will not cause overheating unless it is defective

  • Stat will not cause overcooling unless bad

Pg... 321C

Pg... 273L


Cooling fans

Pg... 235C

Pg... 276L

COOLING FANS

  • Engine driven fans

  • Fan Clutch - Speed limiting & Heat Sensing

  • Flexible Fans

  • Electric Fans - Can operate anytime

  • Fans are necessary for low speed operation

  • Can be Clockwise or CCW

  • Diagnosis and Inspection


Hoses and clamps

Pg... 283L

Pg... 239C

HOSES AND CLAMPS

  • Made of oil and ozone resistant reinforced synthetic rubber

  • Performed Hoses

  • Flexible hoses

  • Worm gear type hose clamps

  • If one hose is bad, usually a good idea to replace all hoses

  • Clamp Placement must be correct


Anti freeze and additives

Pg... 242C

Pg... 283L

ANTI-FREEZE AND ADDITIVES

  • Ethylene glycol based - Good for 1-2 yr

  • 50/50% solution recommended

    • Lowers Freezing Point

    • Raises Boiling Point

    • Provides lubrication

    • Inhibits Rust and Corrosion

  • Protection Chart Pg... 243L

  • Testing (Strength and Electrolysis)


Preventative maintenance

PREVENTATIVE MAINTENANCE

  • Every 12K to 15K miles perform cooling system maintenance

  • Replace belts if bad

  • Replace antifreeze 50/50 mixture

  • Pressure Testing System

  • Check Fan operation


Diagnosis

Page 284-85L

DIAGNOSIS

  • Radiator

  • Water Control Valve

  • Water Pump

  • Thermostat

  • Cooling System Leaks

  • Electrical Related System


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