Our 2011 Routan SE w/ 8K miles is having a sporatic issue with the air conditioning....We believe. Every few weeks there is a loud, grinding sound underhood followed by a puff of white smoke. Turning off the car stops the noise. But here is the thing, it only happens with the air conditioner on and at a stop. The air conditioner appears to get louder leading up to the event.
To me, it seems to be an issue with the AC compressor but since it is sporatic, the dealer has not been able to replicate it. In searching, I have not found any issues like this with the 3.6 Pentastar in other vehicles.