I recently bought an 84 300sd. While replacing an old battery, I busted a small hose that caused the leaking of radiator fluid. I noticed further down the hose that the connection was also broken, and there was a lot of rust under the battery (I assume the line had been leaking a little for some time).
I thought at first that this was the auxiliary water pump that has been mentioned on this board, but I'm not so sure. I does seem to pupm, but there are three large hoses that go in/out and one smaller hose (which broke off). It seems like too fragile of a plastic part to glue back on, but I'm sure a replacement would cost quite a bit. Any ideas?