CPU Overhating!

[Juckil]

After a very long time of my PC running perfectly fine, it suddenly was very slow yesterday and crashed multiple times. I di a quick check and it turns out the CPU was at 100 Celsius! I have a water cooling system and I'm not sure what's wrong. The reservoir (I think it was that) looked like it had plenty of water in, but some of the tubes had large either dried out sections or air bubbles.
Pictures:

Anybody know what's up and how to solve it? I sure hope it won't cost much
Thanks

 

[jarlmaster]

Flush your watercooling loop and refill with new liquid. Perhaps replace the tubing. The amounts of liquid missing is of concern and is certainly what is causing the issue.

 

[lhuser]

Check your pump. and try to flush out that radiator out too. if you see your pump not working properly, that pump is shot. Rebuilding it yourself is possible, but not guaranteed.