Radiator hot on top, cold on bottom

What's the problem?

 

That's kinda how it's supposed to work. Goes in the top hot and comes out the bottom cooler.

Is your engine temp running too cool?

 

This radiator, does it flow top down, or is it a crossflow.

Top down it HAS to be cooler on the bottom. If its the same going in as going out, its not cooling anything. I'd be considering an airflow issue in that case.

 

Radiator are designated to cool the coolant. The liquid exits, cooler than when it entered. Is it the radiator itself that is cooler (or not), at the point that the coolant exits? Or are you checking the temps on the hoses?
Look at the directions of the fins, do they go up and down, or side to side?

 

That is actually normal, what problem are you having?

 

I think he said it was overheating during a pull.

I'd check that all the shrouds are in place, air can flow through easily (no folded fins, dirt/debris collected on the core etc). Fins will start detaching from the tubes over time. That will reduce cooling efficiency as well. If fan was removed, was it installed backwards?

Rads can collect rust/scale on the inside of the tubes. Acts as an insulator and prevents heat transfer from the coolant to the core and then to the passing air.

What's the coolant mix ratio? Running straight coolant is a big no no. It will cool much worse than 50/50.