ROG STRIX-RX480-O8G-GAMING fans not starting and not working even at high (80+) temps please help

I just built my first pc a couple days ago after weeks of buying parts and such, I thought everything installed right, i installed drivers apps ect.. When i started playing games i realized the fans were not working for the GPU and the temperatures were getting very hot, ive tried MSI after burner, Wattman and GPU tweak II to try and start the fans but none of them worked... Am i missing something? I really need help thank you