A custom loop rewards routine care. How often it needs attention depends on the coolant used, the parts in the loop, the dust load where the machine lives and how hard it runs — so think in terms of what to check rather than a fixed calendar.
Dust radiators and fans, check coolant colour and level, inspect tubing for cloudiness, and listen to the pump. A few minutes of visual inspection is what catches most early issues, and it is worth doing whenever you clean the rest of the machine.
Top up coolant if the reservoir has dropped, clean case filters thoroughly, and re-check flow. Pump noise that has changed since the build is a signal to look closer — usually air, sometimes wear.
Full drain, flush and coolant replacement, inspecting blocks for buildup, replacing o-rings that have compressed, and re-testing the loop under load before it goes back into daily use. Coolant manufacturers publish their own service intervals; follow the one for the coolant actually in your loop.
Coolant that has discoloured or gone cloudy, visible residue in blocks or the reservoir, temperatures that have crept up against the same workload, or any weeping around a fitting are all reasons to have the loop serviced rather than waiting for a date on a calendar.
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