Here is the only Forum thread I found about P0480 Check:

https://www.crossfireforum.org/forum...ing-light.html

If I read your posts correctly, the A/C is blowing cold, and no issue with Temp readings, so overheating is not the issue.

The Fan is just running at max speed always.

I would also go with the FCM, or possibly a wiring issue, like a short to ground, keeping that Fan running at full speed...