While it’s a shame you’ll have to take the time to get this repaired, you’ll be happy to hear that your thermostat is covered by your Chrysler’s powertrain warranty. The powertrain limited warranty lasts 5 years or 60,000 miles.
Since you’ve only had your car for a few months, it’s pretty unlikely you’ve put 50,000 miles on it, so you shouldn’t have to worry about any unplanned repair costs.