I have an 1989 Bayliner Capri with a 2.3L OMC SOHC Ford 4 cylinder in it and its over heating. it seems like there is no water coming up from the stern. I have replaced the water pump, impeller, thermostat and various hoses but still there doesn't seem to be any water coming through the system. If anyone can give me an idea where a blockage might be or what other problem might be causing this, that would be a big help. Plus any schematics of the cooling system would be a huge help too.