Approximately 3 weeks ago, my air conditioning went out in the 2017 Cadillac XT5. I purchased the vehicle from CarMAX (Waldorf, MD) and along with it an extended warranty through CarMAX (CNA--MaxCare). When I purchased the vehicle I had about 1 1/2 years left on the bumper to bumper to warrantly with Cadillac GM. I have always taken my vehicle to the Cadillac dealership in Waldorf, MD for service. I took it on July 1 and it was determined that there is a hole in my air conditioning line near the rear exhaust system. I discussed the issue with the extended warranty company and they call it an outside influence (it being the exhaust system) and refuse to pay the cost. I took the vehicle back to Cadillac service center in Waldorf, MD for photos to pursue this matter further. I have now found out that the hole in my air conditioning line is by the cadillac converter. I need to understand why in an 2017 cadillac XT 5 would the air conditioning line (through no fault of my own) be anywhere near the cadillac converter for it to burn a hole in the air conditioning line. I've been waiting for over a week for the Cadillac service center to get back with me as they were suppose to address the issue with GM to see if they will pay for the cost, especially since I am not far outside of my bumper to bumper warranty. My mileage is about 56, 000