Cooling system ppt

21,498 views

Published on

Published in: Business, Technology
5 Comments
19 Likes
Statistics
Notes
No Downloads
Views
Total views
21,498
On SlideShare
0
From Embeds
0
Number of Embeds
13
Actions
Shares
0
Downloads
1,213
Comments
5
Likes
19
Embeds 0
No embeds

No notes for slide

Cooling system ppt

  1. 1. THE COOLING SYSTEM
  2. 2. Purpose • To regulate the engines internal temperature • To remove excess heat from the engine • To provide heat to the passenger compartment
  3. 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. 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. 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. 6. Flex Blade Fan • Fan blades flatten out at high speeds, reducing noise, increasing horse power
  7. 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. 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. 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. 10. How a Radiator Works
  11. 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. 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. 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. 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. 15. OLD NEW
  16. 16. Overvie w
  17. 17. SUBMITTED BY:ASHU RANJAN ROLL NO

×