The Volvo V40 Water Pump prevents engine overheating as it pushes coolant into the engine block and radiator, where the heat is quickly removed. The Water Pump is located in the wider Volvo cooling circuit, near the bottom radiator hose, and consists of a shaft that spins on closed bearings, one end of the shaft having a belt-driven pulley, the other an impeller pressurizing the clean coolant into the water jackets drilled into the block and head. The majority of previous units in the small Volvo were mechanically connected to the crankshaft by a serpentine or timing belt, whereas some more recent V40 models have been fitted with electrically powered pumps, but both mechanisms serve the identical purpose of running nonstop circulation. The material selection has changed from cast iron to lightweight aluminum castings, reducing mass and avoiding corrosion without compromising durability. The coolant cannot reach the bearings, and the rotation is smooth and noiseless, which is achieved by a tight shaft seal. Coolant leakage, rattling sounds, and an increase in the temperature level indicate that the previously reliable Water Pump might have worn-out bearings or a broken impeller that cannot circulate the fluid anymore. Otherwise, heat quickly accumulates, and within minutes the Volvo engine can be seriously damaged, and therefore, replacement in time will ensure that journeys will be safe and that power will be provided in the same way.
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