Water pump: It allows the refrigerant to flow inside of the engine.
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It is inside of the engine but it is surrounded by a serrated belt. The timing belt of the engine moves it. After some time, its internal booster may get damaged and stop pumping liquid. You should replace it every time you change the timing belt.
I bought a Ford Fusion and, at its 22000 km, water started leaking through some head gasket plugs. The water pump is anchored and I have been told that, as my warranty is out of date, there's nothing the agency can do for me.