I have a 2008 Porsche Cayenne GTS that is now getting a maintenance code of P2181 Cooling System Performance. I've read other owners postings that have received the same codes and there was mention of a Porsche TSB. How do I obtain the Porsche TSB to read about this? Thank you in advance!

 

Did you ever get an answer to this? I have the same issue. If anyone knows the answer to this, please help. The temperature is not maintaining it's normal range as if the thermostat is stuck open. I have tried two other thermostats and all three (OEM original included) are not stuck in the open position. I even boiled them in a pot of water to check that they were all working at the correct temperature. I tried changing the coolant sensor as well and that didn't help either.

I am new to this car (2009 Turbo S) It's like a hose is crossed somewhere over into the radiator. Is there a scenario where that can happen? Perhaps with the 2nd water pump complex used for the HVAC?