new toy i been building... found the radiator a few weeks back in scrap pile.. just got finished with the water block about an hour ago.... im going to try it as a Thermosiphon to start, and it is the reason for the design of the water block and radiator, which is set up to easily pull the hot out of the top of the block, run it in the top of the radiator, and pull the cooled coolant out of the bottom of the radiator...
it works ok for what it is, being i milled the water block out of materal salvaged from a large heatsink for a welders rectifier and the copper pate on the bottom is salvaged from another CPU heatsink. tested it with a pocket torch, and it didn't get over 48*C at the hottest... it still may get a pump, but that depends on how the test goes on the crash test dummy PC i have...
https://www.youtube.com/watch?v=x0BU7E6NG8I