The Avid Flyer Mark IV cowl was originally designed for the Rotax 582 engine. It has two large cooling air intakes (two 240 sq cm / two 37 sq in) at the top of the cowl. With a 582, a water radiator is mounted behind each intake. There is no oil cooler. At first, the oil cooler was moved in front of the water radiator, where it would be easier to partially block it in cold weather conditions and thus raise the oil temperature. However, any attempt to block the oil cooler also blocked the water radiator, resulting in coolant boiling in climb.