Don't know what the deal is but my water pumps keep failing. First one was some cheap Napa pump the other two were Airtex from Atlantic British. About every 6K miles the pumps start leaking out of the weep hole. After the pump #2 I changed the fan clutch and a fan, flushed the coolant really well. Any suggestions? I am tired of spending money on coolant. Changing a water pump every oil change is ridiculous.