100 Celsius is not a good thing for any computer. My current desktop computer is running at about 35 Celsius.
I had a Lenovo ThinkPad Yoga 12 with a broken CPU fan. The CPU fan is an absolutely essential component to cool the device. At the time I needed to get some stuff done and could not return it for repairs, so the best option I had was to purchase a laptop cooler. In the pursuit of a better opinion I bought two of them. One is a generic one, which goes by the name of LB1 High Performance Super Cooling Fan. The other one is branded, named the Cooler Master NotePal X-Slim. I would also recommend having a laptop cooler if you intend on using your Yoga 12 as your main computer (perhaps hooked with the OneLink ProDock) at home, which will prolong the lifespan of your device. Some images and thoughts below.