A water pump can fail to provide the proper amount of coolant flow through the cooling system of the are worn or slipping on the shaft.

A water pump can fail to provide the proper amount of coolant flow through the cooling system of the impeller blades  are worn or slipping on the shaft.

Explanation:

IMPELLER BLADES -: Impellers (also spelled impellers or impellers) are revolving machines designed to modify liquid , gas and vapor flow and/or pressure. Impellers consist of several vanes grouped around a short central shaft, often blade-shaped.

Impellers are usually used in pumps, agitation tanks, washing machines, and other devices that enable fluids or gases to travel in a particular direction, and are integral components of them. The picture below shows an impeller 's location and role in an impeller pump. Fluid enters through the orifice on the right in this example and is passed through the pump using a suction and pressure combination before the fluid is passed through the output orifice on the left.

Hence , the answer is impeller blades .

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