When you crawl into the crawl space where the rotor gearbox is. Turned toward the engine, it would be on the upper LH side of engine. There is an air to air cooler line that goes into it. It is black and about 3 in diameter. Should have a yellow plug. Harness goes over the head, angled back over the head. There is another connection in that harness right beside where the turbo actuator plugs in. It will be grey/black and rectangular.