Temporarily, Survey on the stove!

As always stove became worse, removed, and washed the radiator was the question squarely YET WHERE TO SUPPLY beam above or below? when viewed from the radiator it has arrows and if the top to take the arrow that UTB supply and the lower tank line (the photo shows), I believe that the line of antifreeze push downwards than turnover hoch even cooler is almost in a horizontal position.
STILL WHAT beam from above or below)))