Hey so I’m redoing all my cooling system(1995 325i e36) and behind the water pump, those few bolts, I had taken off thinking it would take off water pump cause it was super stuck at first, ended up realizing that I’m stupid and I put them back in, one of them snapped, I tried to extract it, and ended up messing that up, so I stuck a new bolt in there, it threaded in good then I wanted to take it out to measure and make sure it ended where the broken one ends, it will not come out, just keeps spinning, wondering what is all that behind the water pump, assuming it’s just coolant passages? Anyways anything would help because I think I’m going to leave it how it is and see if it leaks or anything is acting up, all the cooling stuff should be here Friday and it’ll be running that weekend

TLDR-1995 325i e36 what is behind the water pump, coolant passages?