Custom PC Overheating and Liquid Cooler Leak Response¶

All-in-One (AIO) liquid coolers and custom liquid cooling loops circulate conductive fluid directly above expensive graphics cards, motherboards, and power supplies. A fitting rupture, tube slip, or pump seal failure can drip liquid across energized circuits, causing short circuits and component destruction.

Emergency Response During an Active Liquid Leak¶

Cut Main AC Power Instantly: Flip the power toggle switch on the back of the Power Supply Unit (PSU) or pull the wall power cord immediately. Do not use the operating system shut down command, as every second of active electrical current increases short-circuit risk.
Tilt System Away From Graphics Card: Carefully tilt the computer case away from the GPU and motherboard VRMs so dripping coolant runs down empty case walls rather than pooling on circuit boards.
Absorb Coolant With Microfiber Cloths: Place absorbent towels around the leak base. Dab (do not rub) wet circuit boards gently.
Clean Residual Coolant With 99% Isopropyl Alcohol: Flush affected PCB surfaces with 99 percent pure isopropyl alcohol (IPA) to displace water and dissolve conductive glycol or anti-corrosive additives.
Allow 48 to 72 Hours Drying Time: Leave components dismantled in a warm, dry room with active airflow for at least 48 hours before testing power.

Resolving Severe CPU Overheating (Above 95 °C / 203 °F)¶

Identify AIO Pump Failure: Touch both AIO rubber tubes while the system runs. If one tube is scorching hot and the other is cold, or if no pump vibration is felt, the internal pump impeller has failed.
Check Thermal Paste and Mounting Pressure: Dried thermal compound or loose CPU cooler mounting brackets prevent heat transfer to the heatsink.
Clear AIO Air Bubbles: If the AIO radiator is mounted at the bottom of the case, air bubbles accumulate in the pump block, starving it of liquid. Remount the radiator so the top of the radiator is positioned higher than the CPU pump block.