My Arctic Freezer III 420mm arrived in a humid country, shipped alongside my PC case. There was visible moisture inside the case's packaging, but the cooler itself also had water around the fittings, which seems like more than ordinary condensation. I wiped everything dry and placed cardboard underneath it, but I can't find an obvious leak. The cooler still sounds mostly full when I move it, with only a small amount of liquid movement. Since a slow leak could eventually damage the rest of the PC, should I return it, or are there safe tests I can perform first?
2 Answers
If you’re not confident that it’s safe, returning or replacing it is the lowest-risk option. A leaking AIO could damage expensive components, and it’s difficult to prove a slow leak before installing the cooler. Since you currently have no electronics in the system, you can also dry it completely and perform a long test with cardboard or tissues underneath. Check for any fresh drops over several days, especially around the fittings and pump block.
A sealed liquid cooler normally contains a small amount of air, so hearing some sloshing or squishing is expected. If there’s no visible physical damage and the liquid level seems normal, it may simply be condensation from the humid shipping conditions. You can gently move it around to check whether the sound suggests a large amount of missing fluid, but don’t puncture or open anything.
I can hear a little squishing, but it still seems roughly 90–95% full. The moisture seems concentrated near the fittings rather than spread across the radiator, so I’m worried it could be a very slow leak. The case packaging also had moisture inside the plastic, which makes condensation possible.
I’m testing it upside down with cardboard underneath and trying to see whether any fresh liquid appears. If it stays dry, I may mount it in the empty case and leave tissues underneath for about three weeks before installing the other components.