Joey Rossi

I have a 2015 Chevy Silverado 1500 LTZ Z71 with the 5.3L V8 and over the past month I’ve had to add a bottle of AC Pro every week for a month now because it would blow cold for a day or two then hot again. Well last night I added a bottle and it was blowing cold and still is blowing cold today but now it sounds like my fan won’t shut off. Any suggestions on too why the fan won’t shut off now ?