Unless that was the color of your cosplay when you put it in you might want to flush your system and put in premix or concentrate with distilled water. To me that looks like there is rust in the radiator.
If plan on replacing it I would find out what it is first. But it kind of looks like a positive Junction box. But to see if that is true test with an ohm tester to find out if any juice is going through there
I have a 1994 Chevy c1500 Cheyenne that needs a new door. It's a manual door and only thing available at salvage yard is electric for my truck. Is it possible to change from manual to electric and How hard would it be. Thanks in advance