This is the sixth waterpump that I have had to replace since I have owned the car. I have bought several from advanced autoparts and even from autozone. The problem is that they are leaking from where the seal gives away (small hole in the pump). Any ideas as to what causes this problem or if it is just cheap aftermarket pumps? The one I bought from the dealership is twice the price, but it lasted a year and a half. I currently have over 180,000 miles and the car runs fine except for the pumps. Any idea if the thermostat could cause this? Your thoughts on replacement.