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THE COOLING SYSTEM

THE COOLING SYSTEM

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THE COOLING SYSTEM

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Presentation Transcript

  1. THE COOLING SYSTEM

  2. Purpose • To regulate the engines internal temperature • To remove excess heat from the engine • To provide heat to the passenger compartment

  3. The Water Pump • Centrifugal-type, rotates faster than crank, up to 10,000 gal. per hour • Pulley driven, belt, chain drive or direct drive

  4. The Cooling Fan • Provides air flow with vehicle stopped • Provides increased air flow at low RPM or vehicle speeds • Belt driven or Electric

  5. Belt Driven Cooling Fan Clutch • Limits actual fan speed no more than 2000 rpm • Engaged at low speeds • Disengaged at high speeds • Thermostatic (temp. sensitive)

  6. Flex Blade Fan • Fan blades flatten out at high speeds, reducing noise, increasing horse power

  7. Electric Cooling Fan • Electric – 12v DC motor driven fan • Controlled in several ways • Engine coolant temp (ECT) switch • A/C select switch • PCM controlled based on various inputs • Fan turns on/off at specific temps.

  8. Electro-Viscous Fan Clutch • PCM Controlled fan speed • Sensors monitored to control speed: • ECT, A/C request, VSS, IAT, Trans Fluid Temp, AAT • Solenoid controls fluid flow, regulating fan speed • Internal hall effect sensor monitors fan speed

  9. The Radiator • Transfers heat from coolant to the atmosphere • Two types – Vertical & cross flow • Aluminum, brass, copper core; brass, copper or plastic tanks • Air movement through radiator created by a mechanical fan or by vehicle movement (ram air) dissipates heat

  10. How a Radiator Works

  11. Radiator Pressure Cap • Regulates pressure in the cooling system • Rated in psi – always replace with same rating • Pressure valve – allows liquid or vapor to escape • Vacuum valve – as system cools, coolant can reenter the system

  12. The Thermostat • Regulates engine coolant temperature • Rated in degrees – 195 degrees most common • Solid Expansion design – wax pellet expands as temp increases, valve begins opening at rating & is completely open within 20 degrees

  13. Coolant • Provides freeze & boil over protection, corrosion prevention & good heat transfer • Ethylene Glycol based – recommended 50/50 mixture with water, poisonous • Dex-Cool – used by GM, 5 year 150,000 mile protection, doesn’t contain silicate & phosphate additives

  14. The Heater Core • Small size radiator located in the dash, coolant circulates through it. A blower motor passes fresh air over it, heat transfers to the cooler air and into the cabin • Many vans & SUV have rear heating units

  15. OLD NEW

  16. Overview