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1 A seal protects the water pump impeller shaft bearing from contamination by engine coolant. If this seal fails, a weep hole in the water pump will leak coolant. If the weep hole is leaking, shaft bearing will follow. Replace the water pump immediately.
2 The water pump impeller shaft bearing can prematurely wear because its mechanically driven. When the bearing is worn it will squeal and it needs replaced don't confuse it with belt sequel though.
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