I run a 1070 hybrid and noticed something strange. The GPU temperature hit 90c but task manager showed 0% load on the GPU. Upon feeling the radiator, it wasn’t hot or even warm, it was room temperature which I found strange that it’d be that cool with the core running at 90c. I’ve tried multiple restarts and cleaned all the dust from the system to no avail, any ideas or thoughts on what this could be or how to fix it?

It sounds like a bad pump? rad isn't getting hot because no water flow so all the heat is stuck in the chip. Isn't there a utility that comes with it to show pump speed?

Either that or a bad driver update that doesn't properly operate the cooling system.