Embodiments of the disclosure pertain to a heat exchanger unit that includes a frame and at least one cooler. The cooler is associated with a respective side region of the heat exchanger unit, and the cooler has an outer surface and an inner surface. The unit can include a mount assembly for coupling the cooler to the frame. The mount assembly includes an elongated fastening member; a rigid outer ring; a rigid inner ring; and a deformable ring disposed between the rigid outer ring and the inner outer ring. The cooler may have a core end mass greater than a tank end mass.