AIO Liquid Cooler Pump Header Constant Speed Configuration
Configure dedicated AIO_PUMP and W_PUMP motherboard headers to constant 100% speed to prevent liquid coolant stalling, cavitation, and overheating.
Internal desktop parts run on harmless 12V DC voltage and cannot shock you. Simply unplug the wall power cable first, then touch the unpainted metal case frame to ground static electricity.
Common Symptoms & Tells
- AIO cooler tubes feel hot near CPU block while radiator remains completely cold
- CPU idles at 60C-75C and throttles instantly under any small load
- Liquid cooler pump makes clicking, gurgling, or buzzing noises
Interactive Fix Checklist
0 of 4 steps completedVerify pump tachometer header connection
Inspect physical wiring inside chassis. The 3-pin or 4-pin cable running from the AIO pump block should be connected to the dedicated AIO_PUMP or W_PUMP header on the motherboard, not standard CPU_FAN.
Set AIO_PUMP header to 100% constant full speed in BIOS
Enter setup -> Fan Monitor. Select AIO_PUMP / W_PUMP header, change control mode to Full Speed or 100% duty cycle, and disable temperature curve regulation. Liquid pumps require constant 12V voltage to maintain coolant flow.
Connect radiator fans to CPU_FAN header
Connect the radiator cooling fans to CPU_FAN (and CPU_OPT if multiple fans). This ensures fan RPM ramps up and down dynamically based on CPU temperature while pump flow remains steady.
Tilt chassis to dislodge air bubbles
If gurgling or cavitation sounds persist, tilt the PC chassis gently while running so trapped air bubbles migrate out of the pump block up into the radiator reservoir.
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