Originally Posted by werds
Well you all are saying a small amount. But does that mean the whole reservoir? I have an IandH StealthRes 175 in this rig which I know I have generally had to top off every year with a small amount of distilled. But the last time I topped off was in August, only the other night I suddenly started to hear a sloshing sound... this scared me as I thought a tube had started gushing! I looked in side the PC and I could see (while running) that the reservoir was pretty much empty when running and the sloshing sound was from the water at the very bottom of the reservoir...
Is that normal? Worried there might be some bigger issue I need to deal with in my loop. Granted I topped it off and I still don't see any leaks anywhere I was just thrown that it needed a refill so soon... first time I had seen the water level drop so fast since I had put together the loop.
Nope, that is definitely not normal. As you saw the previous two years, normal is only a little loss of water per year. Have you rebuilt or swapped in any new components at all recently? Or has your loop been running for two+ years as you mentioned without any changes?
It's likely that you have a slow leak somewhere, or several, possibly at a fitting, or maybe a hairline crack in the res itself. A very slow leak can evaporate away so you might not see any pooling or dripping if that were happening, and it would probably have to be at multiple spots to mysteriously lose the volume of coolant you've lost. If you haven't rebuilt the loop in a few years, it's definitely time for a tear-down and inspection. O-rings can degrade over time, and it's also possible that you could have a little bit of corrosion along a seal somewhere.