My 2014 Nissan Maxima was blowing ice cold air until yesterday when I got in it and started it. It was just blowing outside Temp air. What is the most common problem? It hasn’t lost any Freon. It is still full.

 

Have you confirmed that the AC compressor is kicking on when you activate the AC?

 

Compressor clutch was my problem... You can replace the entire compressor, but I was able to remove the pulley with a 3 jaw puller from Harbor Freight and I found a replacement clutch on Ebuy for 20 bucks. Lasted me a couple years before I inevitably replaced the compressor due to a different kind of failure.