Is there a way to determine if my AIO CPU cooler is working correctly? I built a 4790 system in 2015 with a Cooler Master AIO and since then it has run around 40c at idle with the fans never running. Now the fans are running strongly and the temps are mid 70s at idle. Do I need to remove the cooler and reapply the heat sink compound, is the pump possibly failing, or does the fluid slowly dry up and I need to replace the AIO? I have cleaned the dust out of the system.