Article: Under the Hood: A new water pump averts other problems.

Byline: Brad Bergholdt

Question: I just had my car in for its 90,000-mile service and was told I needed to replace the water pump. I trust my mechanic's judgment but would like to know more about what the water pump does and why mine needed replacement. The bill came to an additional $178 beyond the normal service. _ Karen Porter, San Gregorio, Calif.

Answer: A water pump, attached to the front of the engine, circulates coolant through the engine and the cabin heater. Water pumps are typically belt-driven either by the timing (camshaft drive) belt, a serpentine belt (a wide belt that snakes around many pulleys) or an individual V-belt. Transverse ...

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