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2 Gen 3.7L Water Pump - My Experience
My 2009 Mazda 6S has been rock solid since I bought it new, not a single unscheduled repair in 121,000 miles.
As others have reported, my first indication of a water pump problem was a small puddle of antifreeze under the car leaking about 8 ounces of coolant off per day. The V-6 water pump is driven by the timing chain and is internal to the engine. Engine oil looked fine so I stopped driving it rather than risk contaminating the crankcase with coolant. Normally I perform all my own maintenance but the V-6 water pump replacement instructions recommend the engine be removed so I was way over my head.
My local independent wouldn't touch it once he realized he would have to pull the engine. Next I paid a visit to a import specialist, he recommended changing all the timing chain components as long as the engine was out. His quoted price was $3,100 - ouch! So it was off to my local Mazda dealer for his estimate. He quoted me $1,850 plus tax/shop fees for just the water pump. We decided to do the timing chain/tensioner while we had the engine out.
Total Cost including shop fees and VA tax was just under $2,000.