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.
Had the car for about a year changed alternator did water pump and Thermastat have to put coolant once a week still and i had the code for cam shaft sensors and i get burnt oil smells but not really losing any