Good evening,


I'm have a slight issue with my pump: It makes somekind of bubbles noise when water temperature rises above 30°C to 35°C and with pump frequency set to at least 60Hz.

As soon as the temperature drops, the noise is gone (and no bubbles ciculating in the loop).

The noise seems to originate from the back of the pump (yellow cap); it almost look like air is trapped in this part.


I already made sure the system is fully bled (3 days of moving the case around, bleeding using slow and eventually high pump speed) and that there are no leaks.
I also played around with my fitting (quite a few rotaries) and no air enters the loop (or water leaks).

System: RES - PUMP - GPU - 240 rad - CPU - 240 rad


Could this be linked to a faulty pump (O-Ring - looks fine to me, inlet connection "screws in" just fine) ?


Kind regards.


NOTE: please disregard the bubbles in the reservoir, this was a picture I took when bleeding the loop.

Hi bcikota and thanks for your help.

It's hard to describe the noise but It's similar to a waterfall (a small one that is ). No cracking sound except when running it at < 55Hz (motor noise).


You're right, I used three rotaries (one Q Fitting under the reservoir and two 90°).
I would have liked to link both of these with straight fittings but it's just not possible (not enough room without either kinking the tube or the pump moving around).
As you said it could be the pump struggling to get enough water and eventually leading to cavitation. That would be strange with a 150ml reservoir anyway.

I may remove the optical bay and move the reservoir up to free some space but there's no way to do so on the 350D, unless I cut it.
Another solution would be to use the Aquacomputer D5 (qui smaller than the Aquastream but maybe noisier).

One way or another I'll wait a few days, drain the loop, try straight fittings and eventually change the pump.


Regards.