What is water

water jacket

Glossary “water jacket” Definition:
1). Passages inside the cylinder head and engine block through which coolant flows to transfer the heat. 2). The open spaces within the cylinder clock and cylinder head where coolant flows.

water pump

Glossary “water pump” Definition:
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.