I agree. The tubes go from side to side (silly design IMO). That means you can have a cool bottom (where crud collects) and a warm top.
The top will be hotter in a functioning radiator, but I feel your's isn't functioning correctly.
Why are side-side pipes silly? You should be able to pour hot water down at least 1 pipe so when it's REALLY cold out and your anti-freeze gels up, you can melt 1 tube. Then from there, the engine will clear the way just find it's self. I can't get water to pour sideways. /forums/images/graemlins/thumb.gif