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Cooling systems
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- 3. Cooling System Components •Coolant • Radiator • Heater Core • Radiator Cap • Water Pump • Thermostat • Radiator and Heater Hoses • Overflow Bottle • Diagnosis
- 4. Coolant-Antifreeze • 50/50 mixprovides: • Made up of ethylene glycol (used as lubricant and freeze prevention) • OAT Organic Acid Technology contains no silicates or phosphates Dex-Cool-Orange stuff • HOAT (Hybrid Organic Acid Technology Zerex G-05) • Help maintain correct pH level • Coolant should be serviced every 3 years or 36,000mi
- 5. Radiator • Mounted infront of vehicle • Cross-flow or vertical, top to bottom • Uses air flow to transfer heat from coolant • Should be clean, air flow not blocked by bugs or aftermarket body parts • Made of brass or aluminum • ATF cooler may be inside
- 6. Heater Core • Useshot coolant to heat passenger compartment • Can be used to help cool down cooling system • Is just small radiator • HVAC uses water control valve or moving doors to direct airflow
- 7. Radiator Cap • Sealscooling system • Helps build pressure – 3 deg. for every pound of pressure increase • Allows for coolant recovery when engine cools • Never Remove When Upper Radiator Hose is HOT
- 8. Water Pump • Pumpscoolant through cooling system • Lubricated by coolant • Cooling fan can be attached to pump • Pump can be drive by engine drive belt, timing belt or timing chain inside engine
- 9. Cooling Fan • Canbe electric and turned on by thermal switch or PCM • Can be wax pellet type that is heat sensitive • Moves air across radiator at low speeds or with A/C on.
- 10. Thermostat • Speeds enginewarm- up and maintains constant temperature • Each engine has specific temperature at which thermostat opens • Slows coolant in radiator long enough to remove heat • Can stick and cause overheating
- 11. Radiator and HeaterHoses • Connects the radiator to the thermostat housing • Connects radiator to water pump • Heater hoses connect cooling system to heater core • Allows for engine vibration without damage to parts
- 12. Overflow Bottle • Collectcoolant when engine gets hot and then coolant flows back to radiator when engine cools • If empty, fill to between Hot and Cold mark on bottle
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- 14. Cooling System Diagnosis •Install pressure tester and pressurize to system pressure. • Inspect for leaks • Don’t forget internal leaks!!! • Check radiator cap as well! • Check antifreeze concentration
- 15. Using florescent dye •Add dye to cooling system • Pressurize then check with florescent light • Inspect while using black light and proper black light glasses, dye will glow Yellow- Green
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