I took the GTS for service and my tech told me to bring it back when I have time to have the thermostat housing replaced under warranty. He told me that the earlier cars (mine being a 2013) have the problem. Apparently there is an updated housing Porsche uses since the original one is prone to breaking because it is a "glued" part. My service adviser is really cool and took care of it so I don't have to worry about it failing in the future and leaving me stuck. I just wanted to share so you guy know about the updated part.