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Little noticed, the water pump belt spins quietly at the front of the engine, turning the vanes of the water pump. In turn, water is pushed through the engine block and its cooling galleries, carrying away heat and cooling the engine. The water pump belt may be driven by the timing belt, and its function may also be included as part of an engine's serpentine drive belt.
The water pump belt, which might be serpentine and wrap around and drive several devices, is very robust. With normal maintenance, the water pump belt should last for 100,000. The belt should be changed if there are cracks, shiny spots, or if your car's cooling becomes erratic. Please note that the water pump belt function may be included as part of a serpentine belt function for your car.
The water pump belt or drive belt for the water pump, whether it is serpentine or standalone, keeps a very important piece of your engine working, the water pump. Without the water pump, your engine coolant would quickly evaporate as the engine begins to overheat, leaving you with a seized engine. Listen for any unusual sounds, such as whining and grinding, from the area of the water pump. If you hear them, then it is likely the water pump should be replaced. If you replace the water pump, the belt should be replaced as well.