One problem related to coolant leaking has been reported for the 2018 Jeep Wrangler. The most recently reported issues are listed below.
When I first turn on the heater on cold morning, a maple syrup smell like antifreeze comes out of the dash vents. My coolant overflow tank looses about 1/4" coolant in 2000 miles. I believe there is a pin hole leak in the heater core. The dealer did a pressure test, but the leak must be too small to detect. The smell is nauseating and I understand antifreeze vapor is toxic. .