Racer cpu spiking to 101c when plugged to charger

Already reinstalled windows, already repasted it, cleaned vents and cooling system, tried undervolting, nothing worked. I notice that when im on battery temps stay at 50c for my gpu and 55c cpu even when im gaming, but as soon as I plug in the charger temps reach 100c for both, cpu then gpu in that order. Any idea on how to fix this?