FYI, I also belong to the Jeep Wrangler Forum. Unfortunately we are having the latest 3.6 engine cylinder heads, coded as AC heads failing. These are on the 2013 models. Has there been any reported cylinder head failures on this Forum as it applies to the 2013 Pentastar 3.6?
This is the same failure that was happening to the 2012 models with the AA and AB HEADS.