1-can you tell me if they check the freon levels at the dealer ?
2-having frosted a/c lines is an indication of low freon !!
3-have the dealer scanned the a/c control modules for any faults codes ,on a 2013 model , you can go in the a/c module and run all perimeters test on it ?
any faults with any sensors will show up .
4- If you a/c system detects a low pressure ( example low freon charge ) it will shut off the system or if it will detect a high pressure in the system it will shut off a/c system , I can count a lot of reasons that cause that , but i like to start with why these a/c lines been frosted ? please let me know ?
5- How many miles on it ?
Chad Farhat ( aka - Jhook1398 )
If you have a set a/c gauges yourself , we can check it and confirm if what I'm thinking going on here