Seymour Snerd
Lifetime Supporter
Here is what I found...a few leaks due to loose clamps, one clamp too short for a location, and possibly one hose to short...shoudn't the metal tube bead be on the other side of the clamp?
Regarding 40Bud's comment, that area showing rust and/or electrolysis is the end of (I think) a plated steel pipe, whose end may not be plated (i.e. was cut). I wonder if the rust, etc, is simply the result of having bare steel in the coolant stream. Just trying to be optimistic.
Otherwise you might need to investigate the voltage between the coolant and ground, and make sure nobody is trying to use the coolant pipes as a current path and that no dissimilar metals within that path are touching (like a steel pipe touching an aluminum one within a rubber coupling). There are discussions about this problem elsewhere, but I don't recall where exactly.