And you're saying, that the heat exchangers don't get any hot coolant, but if you put it in there yourself, everything works fine? That's weird.
The heat exchangers work fine, turning on the reactor makes it turn cold coolant into hot coolant, the only thing that doesn't work is the fluid ports.
This is an older version of IC (It's part of a modpack on a server), and the exact same setup works fine in other versions. Did fluid ports just not work at all in that version or something?