Well I have had my H100i for about 3 years now and i think it finally took a dump. I was hearing some crazy noise from it and then my computer shut off. I am assuming it shut off due to high CPU temps. Anyways I got it refurbished so it only had a 1 year warranty. Are there any tips I can try to bring this guy back to life or is it finally time to replace it?

Baseball bat and buy a new one

well time to bring back the 212. I guess i never taken apart an H100i before

It's not worth trying to fix an AIO pump

Yeah for sure. I meant I was just going to take it apart for fun. I'm curious to see how it works now

theres pump in the block it moves water up through the rad which is cooled by passing air, the cooled water then goes down back to the block and repeats.
alternatively google it if you want a visual aid.

Think of a vehicle radiator, same concept.