I would assume that a New OE quality water pump would have a 12 month unlimited mileage warranty. The GK water pump my mechanic installed on 3-4-99 was replaced yesterday. I assumed it was under warranty, but was charged for the part and labor. I was told that the warranty was 12 months or 12000 miles and since I drove 30,000 plus miles, it was out of warranty. I contacted a supplier and they said 12 months unlimited mileage for the same water pump. Does anyone know for sure before I really get angry. What is the norm?