Hey guys, I've noticed that over a period of about a month, the small air bubble in my reservoir slowly gets bigger. The coolant isn't leaking anywhere, and I've had this loop set up since April or so of this year. The air bubble is unavoidable as I have dual Danger Den Rad Res's in my setup, both horizontally mounted, and the cap that would normally be on the top of the res is now on the side. That cap has an indentation inside, so there's no way for me to completely eliminate that bubble.
I've already topped it off a few times with more coolant, and experienced the same result. That bubble just slowly grows til I have to put more coolant in.
Anyone have any ideas on possible cause? Is this somewhat normal?
The fact that the res's are mounted horizontally, not vertically, made the air bubble much easier to notice, and it's more of an issue since it can get close to the nozzles when it gets big enough. I've tightened the reservoir caps about as far as they can go.