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COOLING AND COMFORT HEATING SYSTEMS

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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  1. COOLING AND COMFORT HEATING SYSTEMS CHAPTER 3 Page 54 Classroom Manual Page 56 Lab Manual

  2. 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

  3. 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.

  4. COMPONENTS • 5 COOLING SYSTEM COMPONENTS • Water Pump • Cooling Fan • Radiator • Pressure Cap • Thermostat

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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)

  12. 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

  13. Page 284-85L DIAGNOSIS • Radiator • Water Control Valve • Water Pump • Thermostat • Cooling System Leaks • Electrical Related System

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