Overheating circuit after pump failure

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First post, so apologies in advance.

I bought a custom watercooled PC last year - Obsidian 800d case, i7 930 CPU and 480 both watercooled.

About 3 weeks ago, the pump died [dual bay XSPC 750] - got a replacement from the manufacturer, paid for install by someone with a bit more experience than me with watercooling. Had to take it back due to a huge air bubble, but thats now gone.

Damn thing is still overheating, and am at a loss how to proceed - the cooling circuit goes:

Reservoir- 240 radiator, then 120radiator, then CPU, then GPU, then back to reservoir. Although, to be honest, I can't remember before it went to be fixed if the circuit was that way round, or if the GPU was first

Speedfan is showing cpu temps slowly going up to 100deg [but it cuts off] GPU got up to 70. Checking the tubes - the one going back from the GPU to the reservoir is markedly warmer than the other tubes. The reservoir fluid itself also feels around the same temp as that tube.


Wondering if any benefit from trying to reverse the flow, or to try a different pump. Thanks for any suggestions.
 
It sounds like the CPU block might not be making good contact with the waterblock. Are you able to take a photo of everything so we can see how it's tubed up?
 
What coolant are you using? if it's one with a dye it might have built up/clogged the CPU block and be blocking flow. Did the guy who installed your new pump do a full maintenance?
 
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Not completely sure - would you have expected him to take the whole thing apart, or just the radiator pump?

One thing I've been puzzling over, is how can you check and see if the coolant is circulating?
 
Not completely sure - would you have expected him to take the whole thing apart, or just the radiator pump?

Probably not he probably just did a basic swap. Is the pump definitely plugged in right and working? ie. it's not been accidently plugged into a 5v fan controller or faulty molex etc?

One thing I've been puzzling over, is how can you check and see if the coolant is circulating?

You can get flow meters which you add to the loop. I'd probably drain the loop, check the blocks and refill it but I guess that's not an option for you. :(
 
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The pump is def going - checked with an old HDD adapter with the main power off.

The temp readings I was quoting above where from speedfan, but I also have an Aerocool 1000 display, which is currently reading cpu 67deg [speedfan showing 100deg] gpu 42 [60 on speedfan]. The actual water blocks both feel quite warm [too warm to touch for more than a second]

Any help?
 
The blocks should not be hot to touch, you must have a blockage? I don't know what else it could be if the pump is working alright. What is the reservoir level like and does it change when switched on?

Did the guy who fitted your new pump give you the old one back? they might have swiped the new one and left you with the old broken one expecting you to think you were sent a faulty replacement. :p
 
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Sounds like a faulty pump. Can you see the water moving in the res

maybe the is loads of air in the rads. Open the fill port on the res and gently rock the computer will get the air out if any.

The gpu temp seems ok
 
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Realtemp's reading match speedfans.

New thing last night - ran it for about half an hour, and as the tubing got a bit warmer, then a large air bubble formed between the GPU and CPU blocks. uess this fits with a blockage in the CPU waterblock.

leaf
 
Will your reservoir slide out toward the motherboard? I would lay the case on its side with the reservoir above the rest of the loop if so, that should clear any air pockets.
 
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