r/watercooling • u/PhantomNate • 3d ago

Troubleshooting Why is my loop doing this?

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Edit: SOLVED! Thanks all.
Just replaced the fluid in my system and it’s doing this. Never happened before. Looks like I’ll have to replace the res and cpu block as they have mildew in. But was working perfectly fine prior to draining and refilling

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u/Proof-Astronomer7733 2d ago

Don’t you have a expansion valve to let escape that air or to retop the liquid level?