The best 360mm DIY CPU coolers are for builders who want more control than a sealed, disposable AIO allows: topping up coolant, swapping in their own fans, or growing the loop later. This guide compares refillable, fanless and expandable 360mm options for AM5 and LGA 1700 builds, and explains when a full custom loop is worth the extra effort.
Quick verdict
For most tinkerers, the be quiet! Pure Loop 2 FX 360mm is the pick: a refill port, a fan and lighting hub and AM5 support for about $70. Choose the Lian Li HydroShift II LCD-S 360 fanless if you already own premium fans, and the Alphacool Eisbaer Pro Aurora 360 only if you plan to add a GPU block later.
| Cooler | DIY feature | Fans included | Radiator | Sockets listed | Amazon US price, Nov 2026 |
|---|---|---|---|---|---|
| be quiet! Pure Loop 2 FX 360mm | Refill port, ARGB-PWM hub | 3 x 120mm Light Wings | 360mm, about 27mm thick | LGA 1700, 1200, 115x, 2066; AM5, AM4 | about $70 |
| be quiet! Silent Loop 3 360mm | Refill port, coolant bottle | 3 x 120mm Silent Wings 4 | 397 x 120mm, 52mm with fans | LGA 1851, 1700, 1200, 115x; AM5, AM4 | Not in our data |
| Lian Li HydroShift II LCD-S 360 (fanless) | Bring your own fans | None | 400 x 122 x 24mm | LGA 1851, 1700; AM5, AM4 | about $160 |
| Lian Li HydroShift II-C 360 LCD (no fans) | Bring your own fans, round LCD | None | 360mm | LGA 1851, 1700; AM5, AM4 | about $128 |
| Alphacool Eisbaer Pro Aurora 360 | Expandable G1/4 loop, quick disconnect | 3 x 120mm | 360mm copper | LGA 1700; AM4 (AM5 not confirmed) | about $275 |
What makes a 360mm cooler DIY-friendly
A standard AIO is sealed at the factory, and when its coolant level drops or its fans wear out, most people replace the whole unit. DIY-friendly coolers keep the convenience of a pre-filled loop but add at least one way to service or customize it, which can extend its useful life.
We looked for three features. A refill port lets you top up coolant that slowly permeates through the tubes over the years. Fanless kits let you pair the radiator with fans you already trust. Expandable designs use standard G1/4 fittings and quick disconnects, so you can add a graphics card block or a second radiator.
This is a research-based guide, not a lab test. We started from Amazon US data collected on November 11, 2026, then checked radiator sizes, sockets and service features against manufacturer pages, retailer spec sheets and established reviews. Where listing fields conflict, such as warranty, we say so.
Best 360mm DIY CPU coolers compared
The five options below cover the three DIY approaches. Each section explains who it suits, the verified specs, socket support and the trade-offs. Start with the refillable be quiet! units if you want low effort, and move to the fanless or expandable options only if you need what they add.
be quiet! Pure Loop 2 FX 360mm
The Pure Loop 2 FX 360mm suits builders who want a serviceable AIO without paying a premium. It covers AM5, AM4 and LGA 1700, so it fits most current gaming builds on hot chips, and it bundles a hub that simplifies fan and lighting wiring in a busy case.
The listing specifies three Light Wings 120mm PWM high-speed fans, a doubly decoupled PWM pump and an ARGB-PWM hub that syncs up to six ARGB components and PWM fans. Reviews of the Pure Loop 2 line confirm a refill port on the radiator, and the non-FX 360 review lists a 397 x 120 x 27mm radiator.
Socket support covers LGA 1700, 1200, 2066 and 115x plus AM5 and AM4; LGA 1851 was not listed. The listing’s warranty field says one year while reviews of other Pure Loop 2 models cite three years, so confirm before buying. It was listed around $70 on Amazon US and rated 4.6 out of 5 from about 590 ratings as of November 2026.
- Pro: refill port at a mid-range price
- Pro: hub for up to six ARGB and PWM devices
- Pro: AM5 and LGA 1700 support
- Con: LGA 1851 not listed
- Con: warranty length unclear from the listing
Buy if you want a refillable 360mm AIO for an AM5 or LGA 1700 build at a fair price. Skip if you are on a Core Ultra 200S board, where the Silent Loop 3 lists LGA 1851.
be quiet! Silent Loop 3 360mm
The Silent Loop 3 is the premium refillable option, aimed at builders who care about low noise as much as serviceability. It suits LGA 1851 and AM5 builds with hot processors, where quiet Silent Wings 4 fans and a refill port make it a long-term cooler rather than a three-year purchase.
A retailer spec sheet lists 397 x 120 x 52mm including fans, three Silent Wings 4 120mm PWM fans, an easy-access filling port and an included coolant bottle. The Amazon listing for the 420mm version describes a three-chamber pump with a six-pole motor and a 3-year warranty, which we take as the line warranty.
Sockets for the 360mm version include LGA 1851, 1700, 1200 and 115x plus AM5 and AM4. The 360mm size was not in our Amazon US data, but the 420mm version was listed around $150 and rated 4.7 out of 5 from about 150 ratings as of November 2026, so expect a premium price.
- Pro: refill port and coolant bottle included
- Pro: Silent Wings 4 fans for low noise
- Pro: lists LGA 1851 as well as AM5
- Con: 360mm version not in our Amazon US data
- Con: premium price compared with the Pure Loop 2 FX
Buy if you want the quietest refillable 360mm AIO and run LGA 1851. Skip if price matters more than acoustics, where the Pure Loop 2 FX covers the same refill idea for less.
Lian Li HydroShift II LCD-S 360 fanless
This kit suits builders who already own good 120mm or 140mm-bracket fans, or who want a specific fan model, and who would rather not pay for fans they will throw in a drawer. It also brings one of the larger pump screens here, so it suits glass-panel builds as well.
The listing specifies a slim 400 x 122 x 24mm radiator, a 3.4-inch 480 x 480 IPS screen rated at 500 nits and 60 Hz that hot-swaps through a magnetic pogo-pin connection, and a sliding tube clamp mounted on the side of the radiator. The clamp can attach to a bracket designed for 140mm fans.
Sockets are LGA 1851, LGA 1700, AM5 and AM4. The fanless listing’s warranty field says no warranty, while the TL fan version’s listing states a 6-year AIO warranty, so confirm coverage with Lian Li. It was listed around $160 on Amazon US and rated 4.6 out of 5 from about 175 ratings as of November 2026.
- Pro: no paying for fans you will replace
- Pro: slim 24mm radiator eases top-mount clearance
- Pro: large hot-swappable screen
- Con: total cost rises once you buy three fans
- Con: warranty terms unclear for the fanless SKU
Buy if you own quality fans and want a slim radiator with a big screen. Skip if you need a complete kit out of the box, where the Pure Loop 2 FX is cheaper and ready to run.
Lian Li HydroShift II-C 360 LCD
The HydroShift II-C 360 LCD is a cheaper fanless option from the same family, for builders who want to supply their own fans but prefer a smaller round display. It suits themed builds where the fans are chosen first and the cooler simply has to match them.
The listing describes a set without fans, a 2.1-inch round 480 x 480 IPS display with offline, wireless and USB streaming modes, a sliding tube clamp and corrugated tubing. It warns that if L-Connect 3 cannot detect the cooler, the connected PWM header should be set to full speed in the BIOS.
Sockets are LGA 1851, LGA 1700, AM5 and AM4, and the listing states a 1-year limited warranty, the shortest here. It was listed around $128 on Amazon US as of November 2026. Its rating figures matched the LCD-S listing exactly, so we do not quote them as independent.
- Pro: lower price than the LCD-S for a fanless kit
- Pro: three screen control modes, including offline
- Con: 1-year warranty stated in the listing
- Con: BIOS header setup may be needed for software detection
Buy if you want a budget fanless 360mm kit with a round screen. Skip if warranty matters, since the stated one year is weak for a pump-based product.
Alphacool Eisbaer Pro Aurora 360
The Eisbaer Pro Aurora 360 is the most genuinely DIY option here: a pre-filled loop built from standard watercooling parts. It suits builders who plan to add a graphics card block or a second radiator later and want to start with a working CPU loop today.
Tom’s Hardware describes standard G1/4 threaded components and a dripless quick disconnect for adding Alphacool parts such as Eiswolf GPU blocks or more radiators, and notes a copper radiator, where most AIOs here use aluminum. Mixing copper and aluminum in one loop is best avoided, so stay with copper and brass parts when expanding.
The datasheet we found lists AM4 and Threadripper-class AMD sockets, and a retailer lists LGA 1700, but we could not confirm AM5 support, so check with Alphacool first. It was listed around $275 on Amazon US and rated 4.0 out of 5 from only 32 ratings as of November 2026.
- Pro: expandable with standard G1/4 fittings
- Pro: copper radiator suits later custom-loop parts
- Pro: quick disconnect for adding a GPU block
- Con: AM5 support not confirmed
- Con: highest price and smallest ratings base here
Buy if you want an expandable starter loop for LGA 1700 and expect to add a GPU block. Skip if you are on AM5 or never plan to expand, where a refillable AIO does the job for a fraction of the price.
AIO, hybrid or full custom loop
Choosing between a sealed AIO, one of these DIY-friendly units and a full custom loop comes down to how much maintenance you accept and whether you will ever cool a graphics card with liquid. The more control you want, the more time and money you spend.
A full custom loop with a separate pump, reservoir, 360mm radiator, CPU block and fittings offers the most flexibility and the easiest serviceability, but it costs more and needs leak testing and periodic coolant changes. For CPU-only cooling, a refillable AIO gets most of the benefit with far less work.
Radiator thickness and case fit
Check your case’s 360mm front or top mount and its depth. The Lian Li radiators are 24mm thick and the Pure Loop 2 360 about 27mm, while the Silent Loop 3 measures 52mm with fans. Lian Li lists 360mm and 420mm mounts on the Lancool III, and Corsair lists front 360mm on the 4000D.
Fans for fanless kits
Budget for three quality 120mm fans when you buy a fanless kit, and choose static-pressure-oriented models for radiator use. Match the fan’s thickness to your clearance and confirm whether your board has enough PWM headers or whether you need a splitter or hub for the radiator fans.
Maintenance and coolant top-ups
Refill ports exist because AIO coolant slowly permeates through tubing over the years. Top up only with the maker’s coolant or one it approves, with the radiator positioned as the instructions show. Never open a sealed AIO that lacks a port, because doing so can void the warranty and introduce air.
FAQ
These answers cover the questions builders ask most when moving beyond a sealed AIO. They draw on the manufacturer pages, listing data and reviews used for the options above, so the figures match the comparison table and the product sections above this one.
Can I refill a normal AIO?
Only if it has a refill port, like the be quiet! Pure Loop 2 and Silent Loop 3 models. Opening a sealed AIO without a port risks leaks, air in the pump and a voided warranty. If your current AIO is losing performance after several years, replacing it is usually the safer option.
Can I add a GPU to a 360mm AIO?
Only with an expandable design. The Alphacool Eisbaer Pro Aurora 360 uses standard G1/4 fittings and a quick disconnect for adding Alphacool GPU blocks or radiators. Sealed and refillable AIOs, including the be quiet! and Lian Li units here, are not designed for extra blocks.
Are the best 360mm DIY CPU coolers worth it over a sealed AIO?
For many builders, yes. A refillable AIO like the Pure Loop 2 FX costs about the same as a sealed 360mm unit as of November 2026 and adds a way to extend its life. Fanless and expandable kits make sense only if you value fan choice or future GPU cooling.
Conclusion
Buy the be quiet! Pure Loop 2 FX 360mm. At about $70 as of November 2026, it adds a refill port and a fan and lighting hub to a full 360mm AIO with AM5 and LGA 1700 support. Pick the Lian Li LCD-S fanless kit only if you own quality fans, and the Alphacool only if a GPU block is coming.
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