Water comes back down from my rads to my reservoir.

1509akaMatt

Commendable
Jul 18, 2016
2
0
1,510
I have 2 questions, the first one is a problem that's being giving me headaches and kinda forced me to never shut off my computer.

In the linked picture, my pump has the inlet on it's right side (taking water from the rad) and so it pushed water to the graphics card. The problem is, when i shut off my computer, some water comes back down into the reservoir thus moving air in the rad(s). I have the pump set now at speed #3, when it was at #2 the water level was about an inch higher then it is now and I could hear some "water drops" sounds coming from the right radiator. A lot of games were unplayable (in Dark Souls 3 it took about 10 seconds for the game to close) and most times if not always they'd close and I would get an nvidia driver error message. Now with pump speed at #3, I have no more problems. I would guess a heating issue?

With all that being said, I have seen set-ups with the reservoirs not being the highest point in the case and it never seemed to be an issue. Just leaving the pump at speed #3 (or higher) doesn't solve the problem of having water coming back down from the rads. I would rather keep the pump/reservoir where it is, but if the only solution would be to not have a pump/res combo but have a separate reservoir higher, I guess I could live with that. Any advice is welcome.

2nd question is where would be the best place to put a drain port. This is the first water cooling computer I've built and I guess that might be the only thing I didn't research too much.

Thanks in advance.

Cooling Components:

Ek-D5 Vario X-Res 140
Alphacool 360mm x 80mm Reservoir
Alphacool 240mm x 60mm Reservoir
CPU Block: Koolance 380I
Koolance fittings
Piping: 5/8 o.d. - 3/8 i.d.
Liquid: Just Deionized water with 1 Monsoon Silver bullet in each rad

RmNgmQb.jpg
 
Solution
You've identified the problem - the front radiator (vertical) is mounted in a way that when the flow stops and since you have your I/O fittings on the top of the rad (rather than the bottom) you are creating a semi-airlock. If you were to completely fill your front radiator, you would eliminate the air, or you could flip it 180 degrees and have the I/O ports on the bottom which would essentially prevent an airlock from occurring.

rubix_1011

Contributing Writer
Moderator
You've identified the problem - the front radiator (vertical) is mounted in a way that when the flow stops and since you have your I/O fittings on the top of the rad (rather than the bottom) you are creating a semi-airlock. If you were to completely fill your front radiator, you would eliminate the air, or you could flip it 180 degrees and have the I/O ports on the bottom which would essentially prevent an airlock from occurring.
 
Solution

1509akaMatt

Commendable
Jul 18, 2016
2
0
1,510
Thank you for the reply, I just measured and I would have just enough space to leave the fittings as they are right now (both are on top) to flip the radiator 180 degrees. Should I put them on the side (facing the pump) or can I leave them where they are?

Also, would it be a good place to put a drain port (either in-line or T) between the inlet of the pump and the rad?