How about a new old car

[Hunter]

Look for tell-tale spooge on the inside of the radiator cap and in the coolant tank that may indicate combustion gas leaking into the coolant passages. they blow internally. when I got mine, you could drive it about 40 miles on the highway BEFORE enough pressure would build up to blow the coolant out the overflow....pretty strange symptom

Just so I know, does this look like a bunch of gunk (maybe black) built up around the inside of the areas coolant would be? I want to make sure I know what Im looking for when i go look at one of these.