What is this?
Is that the rear Iron? There is a coolant passage there that I believe goes to the accelerated warmup or something on the intake manifold, mine is blocked off with a bit of tubing and a bolt in the end, he must have gotten creative.
Front iron, sorry. Probably should have mentioned that. It's closer to the front side, however. It looks to be solid, but looking at the rotor side of the iron, there's a passage (coolant?) that runs under it, the best I can think is that it was leaking.



