The water pump ensures that enough coolant liquid is flowing around the cooling system and engine in order to remove sufficient heat to prevent the engine overheating. The higher the load on the engine the more the pump will circulate in order to deal with the greater levels of heat produced as the engine works harder.
Why Water Pumps Fail
Generally this will be due to wear and tear as the pump, in particular the internals such as the drive shaft and impeller, are constantly working. Also the casing can crack and leak due to stress or corrosion. If the pump fails or is not working efficiently then the engine can overheat and this will lead to further problems such as head gasket failure or damage to the engine block or cylinder head.
K-Seal to the rescue
K-Seal will fix most leaks in the water pump casing and even in the seals but it cannot repair damage to the moving parts inside the pump itself.
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