I noticed my 2012 enclave compressor is running loud and a long time once the car is turned off. I have not noticed this before. I expect it would run for a little while when hotter out which it's warm but not hot. Is this a potential indicator of a problem or is it likely the compressor/fan always ran and I just did not notice it? It's really loud and goes on for a while so I am not sure how I never noticed this before.