Gil,

Thanks for the drawing. I placed the drawing beside the picture, and it appears this is exactly what I have. I assume the two bolts shown on top of the polygon are the ones that go all the way down to the thermostat. I suppose I will pull the thermostat and make sure it is opening the way it should. I guess I could put the housing back together and see if the water pump is working without the thermostat, but I am not sure I can see the water flowing because of the configuration. There is no radiator under the metal tank, so the water does not flow like a typical setup.