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This vent hole tells the story of a water pump gone bad. The hole serves as a vent for the water pump shaft. The vent hole releases hot air that builds up inside the shaft. Eventually, the seals at each end of the shaft fail, causing water to get into the shaft area and come out of the vent hole, thereby necessitating the water pump’s replacement.
Water Pump Replacement

This vent hole tells the story of a water pump gone bad. The hole serves as a vent for the water pump shaft. The vent hole releases hot air that builds up inside the shaft. Eventually, the seals at each end of the shaft fail, causing water to get into the shaft area and come out of the vent hole, thereby necessitating the water pump’s replacement.  View Related Article