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I'd turn it off for an hour and let it sit. If the tiny air bubbles start going away that's good. If you turn the pump on and they come back, I'd wonder if there is a chemical creating the reaction or a leak on the suction side of the pump at one of the fittings.
Did you wash the new rads before installing them? Most of the time new rads come with some impurities due to the manufacture process.
What coolant did you go with ?
My rad still smells a bit like solder when my loop gets warm (don't ask me how I wound up smelling my rad), and there was a definite aroma the first time I got it warmed up. It didn't fill the room by any means though, but it was a large room and only one rad. I don't think it has anything to do with the bubbles. It's probably difficult to bleed the loop with the different rads.
Yeah bleeding this thing has been a hassle to say the least. I actually may need some design help to redo the tubing, rad orientation, etc in order to make filling and draining as simple as possible. Bascially I want to just turn the drain nob and let the system completely empty.
There are a couple ways you can do that, but some require some hard mods, your problem is on the gpu and outside rad, so i will tell you the best for that layout, you have to rotate de top rad, then you install a t adapter on the rad outside of the case and place your valve there, when you want to drain you simple flip the case so the io (back of the case) is your bottom part and open the valve, if air resistance don't let water come out you loosen one of the unused ports on the front rad.
Their are other/better ways to do this but this is the simplest and will work well.
ps: i told you that rad layout would be a pain
next time you redo your tubing mount your drain **** at the very bottom of your case/loop with a 1/2in barb connected to it. preferably somewhere that you can easily attach the hose. ive got mine setup in the bottom chamber of my case. it takes a couple of seconds to attach and tighten the 1/2x3/4in drain hose and 30sec to open the fill port on my res and drain the entire loop.
just checked out your other thread and saw that it looks like your drain is already at the bottom of the loop?