Not sure on the miles, odo doesnt work lol. Its about 5 years old. Correct, quiet while running, just can hear it when i push in on the fan at the top. I know its the water pump, i have a fixed fan, you know i probably need to check the fan bolts and make sure they arent loose and causing me to confuse play in the pulley with play in the water pump. but im 99% sure the play is in the water pump