Elbows heat exchanger to heater flap Type4 (Pair) Bus 08/71-07/85Elbows heat exchanger to heater flap Type4 (Pair) You can find these elbow pipes in the front of your engine (in driving direction ) between your heat exchanger and the heater control flap (that is connected with a cable to your dash control levers). Good condition of these elbows is mandatory to make your heater system work as it should be. We're happy we have found those parts now and added to our ever growing program to keep your Volkswagen on the