My guess would be the upper tank is cracked, in the corner/end of the first pic.
Doing a pressure test on it will verify that, or at least help to find the leak.
Some parts stores will do the test for free, or the Hobby Shop may have a tester (if you have access to one)
Or, to do it yourself, top off the fluid (when the motor's cool, of course) then bring it up to operating temp. This should bring the pressure up to 10-12 lbs. (don't recall the cap rating off hand)
Once it's warmed up, shut it off and look for leaks. The pressure will build slightly, once the fan is off and not cooling anymore.
Using a tester is nice, becuase you're not dealing with 200* antifreeze![]()
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