leave your computer on for 3 days strait. that'll cool down aux eventually. hopefully it isn't important though.
or flood your house and find were the water boils.
My computer is on 24/7..... i never turn it off.....
Temp guage probably broken
If it was that hot the part of your case where the aux is would be really hot / melting
Well what is aux? if i knew what it was i could check if it is hot in the area Lol but for the fans i'm guess it might be just a build up of dust over the years that stopped them from working....