Update 2/24/2018
I have a feeling that one of my 40mm radiators is faulty. The temperature difference between the two ends is drastic. The end where the fittings located gets really hot to the touch and the opposite end is just slightly warm, or even cool to the touch.
I actually bought another radiator earlier to test out if I can modify the fittings. While the modding failed, during the process I discover that the wall separating the inlet and outlet are basically non-existent. So the liquid that goes through the radiator won't actually goes through all the fins, but just went straight from the inlet to the outlet, like this:
I took some images back then, here they are:
Back then I thought it's just a faulty unit so I contacted Alphacool and they ask me to find my local seller to get a refund or exchange. I'm a bit lazy so I still haven't done that. Instead, I bought another unit from the same seller, and use that one in my first testing on 2/22/2018.
Yesterday, 2/23/2018, I added another radiator into the loop, this time buying directly from Amazon. I notice that when the system is running, the unit I got from Amazon has a really pronounce temperature difference between the ends. So I'm not sure what's happening here. Maybe the original seller I bought from has a faulty batch from Alphacool, who knows.
Anyways, I'm gonna do some testing later today with my current setup. I bought a temperature gun as well as a new 40mm radiator from Amazon. When they arrive I can swap out this *might be faulty* unit and check out the difference.
That's all, thanks for reading