Hello, my Porsche 996 Carrera 4, year 2000 has the following problem: It has water loss of the cooling water, pressure test of the system was carried out, everything dense! with full water filling up to the overflow of the cooling water tank no bubble bubbles or similar occur with running engine and open container cover, so according to the workshop no hairiss or similar would be present in the engine range! (Motor came in 2012 new the, 320 hp, 3.4 L) Temperature indicator also always shows “normal Tem perature at min. 80 to max. 90 degrees. Nevertheless, he cooks after a ride (not always, came up 2 times up until now) without any signs!! In addition, when he cooks then 2-3 liters of cooling water out of it!!! What can be the cause here!? When I fill up, it can be that he drives again for weeks without problems, whether cozy exit or under full load!! … then he suddenly cooks over again and loses 2-3 liters of water without previous signs or increased teperature according to temp.-Anzeig e!!?? and he cooks in it only when you turn it off! …with running engine, whether in stand or while driving, nothing happens!! Already in advance best thanks!!! LG