I've had my Pan for 4 years now and today flushed the coolant for the 2nd time. 2 years ago when I performed the 1st flush I really struggled getting all the air out of the system. I use the manual bleed valve next to the fill point but still can't seem to get this right. When the temp comes up it gets to 200 and keeps climbing. I shut it down and wait a few and check the level in the filler neck. According to the indicator in the filler neck it's over filled. Has anyone ever read what Porsche recommends as the refill procedure ?? This time I even took all the hoses loose and refilled the radiator and the block before reinstalling the hoses. There's got to be a trick to this...... I just haven't figured it out....yet !

 

You need to use a vacuum unit to properly fill this system. There is a very detailed procedure in the factory service manual (you can google to find a copy).

Regards,

Chuck '14 Panamera 4S