My 240D has an over heating problem. For some reason the cool water from the radiator will not flow through the thermostat. The thermostat is working properly and the radiator is new. The hole in the bottom of the thermostat housing for the recirculated engine water is a little over size from corrosion but the thermostat seat is in good shape. The top hose is 220F while the lower hose is cold.
I am lost