Patent ID: 7000685

Claim:
A cooling system for cooling a heating element, the cooling system comprising: a heat sink through which a cooling fluid passes to absorb heat from the heating element; a radiator communicating with the heat sink through a cooling fluid circuit through which the cooling fluid flows, wherein the radiator radiates the heat of the cooling fluid and is located at a position higher than the heat sink; a pump portion that is arranged between the heat sink and the radiator in the cooling fluid circuit and pumps the cooling fluid to circulate the cooling fluid through the cooling fluid circuit; a bypass passage that is arranged in the cooling fluid circuit to bypass the pump portion, wherein when operation of the pump portion is stopped, the cooling fluid flows in the radiator through the bypass passage while bypassing the pump portion; and means for controlling the pump portion, wherein the pump portion is stopped by the means for controlling the pump portion when an amount of heat generated from the heating element is equal to or less than a predetermined value, and the pump portion is operated by the means for controlling the pump portion when the amount of heat generated from the heating element is greater than the predetermined value.