Question EVGA liquid cooler makes short rattling noises ?

Toreth

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Feb 5, 2021
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I have an EVGA CLC liquid cooler. Every 5-10 seconds, it makes a quick rattling noise. The noise lasts for around half a second, and it sounds like what two components vibrating against each other would sound like; kind of similar to a fan brushing against a wire. It doesn't sound like air bubbles or bubbling liquid. As far as I can tell, there are no loose wires or anything that could be contacting a case/pump fan blade. I've tried applying some pressure to the main cooling assembly and also tried moving the coolant tubes around, but that doesn't stop the noise. It seems like if I slow the pump fan down to its lowest setting, the noise goes away. What could it be?
 
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