Sounds like you're stuck with what we call The Squid. You have to remove all the cables; there are a mix of connectors and bolt on lugs. The best write-up is probably the "Coolant System Rebuild" (
http://www.318ti.org/forum/showthread.php?t=18066) post #3 it talks about the connections. Make sure to label them all, there are a couple blind ones in there.