Its not a temperature problem since the temps are at 65-70… please help
GPU cooler performance this should be checked by a computers builder in your town, and not by you.
It might be GPU cooler fan fail issue (needs a replacement), or the old DC fan needs cleaning and lubrication, nothing of all these its your job to do.
They are involved special tools and skills.
Its not the best timing for DIY experiments and taking the risk at killing your own graphic card.
They are sensitive electronics after all.