I have mine set to always on. That way I don’t notice it when I hit PTT button. One thing I have noticed, however, is when it is cold outside, the fan is really loud for about a minute after starting my Jeep. Once I’ve driven a block or so, the noise is barely noticeable. I also have a Midland MXT500 and Wouxan KG-XS20G. Neither have a fan. Hasn’t been a problem this winter. Most of these radios, I thought, are designed to shut down at high temps. Also, keeping your rag chewing to reasonable lengths can help!