Water pumps. We don’t think about them often, but they’re a really important part of our vehicles. Let’s take a step back. You see, the engine is cooled by a coolant, anti-freeze, mixed with water. This mixture circulates around your engine, absorbing some of the heat. The coolant then flows through the radiator, where air cools it down for the return trip back through the engine. The water pump is what drives this process.