WM 826919 Removing And Installing Water Tube For Auxiliary Heating - Water Tube From Directional-Control Valve To Engine (All Models): Tools
WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.