I turned my month-old JL 2.0L in for service today because the engine coolant temp rises occasionally, sometimes high enough (250 deg) to trigger the red alarm screen. As anticipated the dealer does not have a quick fix. The fan definitely runs. Makes no difference if the AC is on or off. The temp guage slowly rises to the 250 deg alarm threshold and then suddenly drops back down. Happens most often at medium speeds (40-50 mph).