I'm fairly new to PC hardware and inherited a gaming PC with a Ryzen 5 3600. After moving house, the Enermax Aquafusion II AIO pump appeared to stop working. Idle temperatures increased from around 30°C to about 110°C, while BIOS temperatures sit around 70–85°C. The software reports roughly 5000 RPM for the pump, which seems incorrect.
I bought a Thermalright Peerless Assassin 120 SE to replace the AIO, but I can't get the old cooler off the CPU. It feels stuck as if the thermal paste has glued it in place. I've tried warming the system and following removal guides, but it still will not move. I'm also unsure whether the spring-loaded mounting screws are fully removed because they still have resistance. The computer still boots, but I'm worried I may damage the processor or motherboard. What is the safest way to remove the cooler, and should I take it to a repair shop?
3 Answers
A little heat can soften old paste, but avoid overheating the system or using excessive heat from a hair dryer. If the pump still runs, briefly warming the CPU while monitoring temperatures may help, but stop immediately if temperatures climb dangerously. Work with the PC powered off and unplugged, then try small side-to-side rotations rather than lifting. If the screws are definitely out and the block will not move, a repair shop is the safest option instead of forcing it.
First confirm that every mounting screw and bracket holding the pump block is fully loosened. Spring-loaded screws can still feel tight, so remove them gradually and alternate between sides while checking that they are no longer engaged with the backplate. Once the hardware is free, gently twist the cooler left and right to break the thermal-paste seal. Don’t pull straight up forcefully, pry with a tool, or yank the cooler, since the CPU can come out of the socket with it.
I tried warming it and twisting it, but it still feels completely stuck. I’m also not sure the spring screws are fully released because they still have resistance.
Don’t keep running the computer at 110°C just to test it. The system may be throttling to protect itself, but continued operation at that temperature is unnecessary. Once the cooler is removed, clean the old paste with isopropyl alcohol and install the replacement cooler according to its mounting instructions. Afterward, check whether the motherboard supports a newer Ryzen processor, but solve the cooling problem first.
I already tried that approach and it didn’t loosen the cooler, so I’m leaning toward having a shop remove it.