One GPU fan reads (-1%) and overheats. How can I fix this?

Just like the title says. I saw the post where someone had the audacity to talk about a way he thought hashcat could be beat (he was wrong) but all the big hitters on this forum came running to tell him just how wrong he was. I had posted just before him and only got someone telling me I run my cards too hot and zero mention of one fan shutting down.

Could I get help with this please? This is an amazing program and I would like to get the most out of it but one GPU isn't cutting it.