Hello I have a 830 diesel that I have a tank heater ( 1000 watt ) from the block drain to the water manifold by the sending unit for the gauge ( I drilled a second hole on a flat spot that looked like it was cast for another hole, I did not like having the sending unit above the manifold in the tee ) this dose not seem to work, the radiator heats up but not the blocks, I put a new thermostat in when I replaced the radiator in march it also has a heater above the oil filter ( this thing is about like lighting a candle ) my neighbor has a 930 that they drilled a hole in the center of the manifold by the center of the middle valve cover that works great for their tank heater. What are your thoughts bad thermostat, outlet hose to close to the thermostat, should I move the water inlet in the manifold ?? Thanks Bryan