An electrical connector assembly includes an insulative housing, a first cover pivotally assembled to the housing, a second cover pivotally assembled to the first cover, and a fan support secured upon the second cover. A plurality of contacts are disposed in the housing. A heat sink is associated with the second cover. A pair of fans are located by two opposite lateral sides of the heat sink and fixed to the fan support so as to induce an air flow along the slots defined between fins of the heat sink in a transverse direction.