something on my car keeps running after turning car off. might be compressor

What is your question?

When starting car and backing out of garage. If I shut motor off. Something keeps running. It is not the motor, I think it is compressor or something. It will run until I restart the car and take it around the block or something , then when I turn it off it is fine.

What makes this problem better or worse?

Can happen any time.

How long has your 2015 Buick Regal had this problem?

A few weeks. (Intermittent)