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All auto cooling systems are pressurized. The radiator cap holds the pressure in the system at about 15Lbs. The reason for it is it causes the boiling point of water to be at a higher temperature so the water doesn't boil away as easily. The big white tank beside the radiator allows boiled water STEAM to stay in the cooling system and condense back to water and return back into the radiator as it cools. Champ390

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Q: What is presurised cooing system?
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