DRIVING ON INTERSTATE HIGHWAY, CHECK ENGINE AND ADD COOLANT LIGHTS ON. STOPPED ADDED COOLANT, DROVE HOME PARKED IN DRIVEWAY. OUT TO USE CAYENNE AGAIN, NOTICED COOLANT ON DRIVEWAY, STARTED ENGINE COOLANT LEAK ALLOVER DRIVE. CALLED PORSCHE DEALER, NOT COVERED UNDER WARRENTY, ALSO 2 WEEK BACKLOG IN GETTING REPAIR, CALL INDEPENDENT SERVICE AND HAD TOW TO INDEPENDENT GARAGE. REPLACE ALL COOLANT PIPES AND WATER PUMP. AFTER REPAIR "INTERNAL ENGINE NOISE". OK TO DRIVE. *TR