A common cause for overheating is to have the improper early fan installed on a late model car.  This is the stock cooling fan for late model doghouse cooler with the wider fan blade.  NOTE:  THis fan is approximately 37mm wide and NECESSARY for proper cooling on all dual port motors.  It is also correct for single port motors that have been upgraded to the later doghouse style cooling system.  It will fit in most late model aftermarket fan shrouds, not matter what style for improved cooling.  It will NOT fit in stock VW fan shrouds with the early cooling system.