How to Install AIO Liquid 240mm: Step-by-Step

Quick Answer

Installing a 240mm AIO is a one-hour job if you prep first. Mount the radiator in the top or front of the case, attach the pump bracket to your CPU socket, apply thermal paste, secure the pump head, plug the pump into the AIO or pump header, and connect the radiator fans before booting. Test temps with a stress run and you're done.

What You Need Before Installation

Lay out everything on a clean desk before you touch a screwdriver. You'll want the AIO unit complete with radiator, fans, pump, and tubing; the socket bracket kit for AM5, AM4, LGA1700, or LGA1851; thermal paste (the small tube included is fine, or use Arctic MX-6 or Thermal Grizzly Kryonaut from evetech.co.za); a Phillips screwdriver; isopropyl alcohol wipes; and a torch or phone light for the inside of the case.

Confirm case clearance first. Most modern mid-tower cases like the Lian Li Lancool 216, NZXT H5 Flow, or MSI MAG Forge 100R fit a 240mm radiator in the top with no drama. If the top mount conflicts with tall RAM heatspreaders, switch to front mount instead. Note that front mount with the tubing pointing up traps an air bubble in the pump head over time, so always orient the radiator with the tubing entering at the bottom or with the radiator above the pump.

Mounting the Radiator and Fans

Decide push or pull. Push pulls cool air from outside the case through the radiator into the chassis. Pull does the opposite, exhausting hot air through the radiator. Most SA builders prefer top-mount as exhaust because Highveld summer ambients punish intake-only setups. Use the included long screws to fix the fans first, then mount the assembly to the radiator, paying attention to fan direction arrows on the side of the fan frame.

Lift the radiator-fan assembly into the case and bolt it to the top or front fan mounts using the supplied short screws. Tighten in a star pattern so the seal stays even. Route the fan and pump cables behind the motherboard tray now, before you fit the pump head, because doing it later is fiddly.

Mounting the Pump Head and Applying Thermal Paste

Remove the existing CPU cooler if there is one and clean off old paste with an isopropyl wipe. Install the AIO's backplate behind the motherboard or use the AM4 native backplate as Corsair, NZXT, and Cooler Master kits often skip an extra plate on AMD. Screw the standoffs into the appropriate socket holes.

Apply thermal paste in a single pea-sized blob in the centre of the IHS. For Ryzen 7000 and 9000 with the irregular IHS, the pea method spreads correctly under pump pressure. Lower the pump head straight down without sliding, line up the bracket on the standoffs, and tighten the four screws in a star pattern, two turns at a time. Stop when each screw feels snug but not crushing. The bracket should sit flush against the IHS.

Plug the pump's three-pin or SATA cable into the dedicated AIO_PUMP or pump header on your motherboard, set to full speed in BIOS so it never throttles. Plug the radiator fans into the CPU_FAN or a fan splitter so they ramp with CPU load. RGB cables, if present, route to ARGB headers or the included controller hub.

First Boot, Air Bleed, and Stress Test

Before closing the case, double-check no cables are tangled in the fans. Power up. The pump should hum quietly and fans spin at low RPM. Listen for a gurgling sound, that's air moving through the loop, which is normal for the first few minutes. Tilt the case gently side to side to push trapped air toward the radiator where it belongs.

Run Cinebench R24 for ten minutes or Prime95 small FFTs for five and watch CPU temps in HWiNFO64. A Ryzen 7 7800X3D should peak at 75 to 80 degrees, a Core i7-14700F around 80 to 90 degrees on a 240mm. If temps spike past 95 degrees you've got bad mount pressure or trapped air. Repaste, retighten, and retest. Loadshedding-prone builders should run the boot test on a UPS so a sudden power cut mid-stress doesn't risk the system.

Frequently Asked Questions

How long does a 240mm AIO last in SA conditions?

Quality AIOs from Corsair, NZXT, MSI, and Cooler Master rate for 50,000 to 70,000 hours of pump life. In SA's warm summers and dusty environments, expect five to seven years of solid service. Clean radiator dust every six months with compressed air to maintain airflow.

Is a 240mm AIO enough for a Ryzen 7 9800X3D?

Yes, comfortably. The 9800X3D has a roughly 120W power draw under gaming load and a 240mm radiator handles that with thermal headroom. For a Ryzen 9 9950X or Core i9-14900K you'd want a 280mm or 360mm.

Should I refill the AIO coolant ever?

No. Modern AIOs are sealed units and any DIY refill voids the warranty. When the unit ages out in five to seven years, replace it as a whole. Same-day Joburg, Cape Town, and Durban delivery from evetech.co.za makes the swap straightforward when the time comes.