im not sure if its the after market fans or what but i have change this fan 3 times and each has only lasted no longer than 1 months time. Eventually the fan cracks and begins to whooble causing the entire car to vibrate. Im nervous of buying the original manufactured fan which is around $350.00 and it does the same thing. Does anyone has any clue to the reasons of my fans constantly cracking also once i do install these fans they al very high sounding like a industrial fan. please help i am so tired of replacing this fan.