We have a 1995 190 Horizon with the 5.0 Cobra engine (302). I am a previous outboard engine owner, so this I/O is a whole new world to me. I have looked at schematics trying to find an impeller for the water pump (like my outboards had), but cannot quite locate one. Is there one at all? How does the engine cool itself through the outdrive. It seems that my I/O is running warmer than normal, although it's difficult to tell by the gauge as it isn't as detailed as others I've seen. The gauge is spaced nicely up to 150, but then makes an evenly spaced jump to 200. I figured I'd start with the easy stuff and go from there, but I can't find the easy stuff! Any help would be appreciated.