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Parts of the Cooling System


  • Cooling Fan: an electrically - mechanically - driven fan to increase air flow across the radiator to facilitate heat removal


  • Coolant Reservoir: A tank used for storing excess coolant; connected to the cooling system with a small-diameter overflow hose


  • Heater Core: a small water-to-air radiator -like heat exchanger that provides heat for the passenger compartment


  • Radiator: a heat exchanger used to remove heat from the coolant in the cooling system containing a vertical-or horizontal-finned tubing section connected between two tanks


  • Thermostat: a temperature-sensitive component located in a housing at the coolant outlet of the engine that restricts coolant flow to the radiator to maintain the desired engine-operating temperature


  • Water Pump: a device, usually located on the front of the engine and driven by one of the accessory drive belts, that circulates the coolant by causing it to move from the lower radiator-outlet section into the engine by centrifugal action of a finned impeller on the pump shaft.


  • Radiator Hose: provide a flexible connection for coolant flow between the engine and the radiator.


  • Heater  Hose: connects to the water pump and the heater core, which is located next to the firewall on most vehicles. As the hot coolant passes through the heater core, a fan circulates air across the core, which heats the air and distributes it throughout the automobile's cabin.


  • Radiator Cap: the radiator cap allows coolant to escape to an external reservoir when coolant pressure becomes to high.

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