Heat Sink Fluid Cooler Kit with AN Fittings Performance Components PSC SteeringPSC Heat Sink fluid coolers are manufactured with both internal and external cooling fins which provide maximum cooling efficiency without relying on direct airflow. The compact overall diameter means they can be mounted in a variety of locations, such as on the frame rail next to the transmission, directly under the radiator, or under the floorboards. The rugged aluminum extrusion features welded ends for long service life in the most brutal