Water flow

which direction does water flow in a radiator?

Water normally enters the radator at the top and goes out the bottom. Some vehicles have a “reverse flow” sysytem.

If you hold (feel) the top hose and then then feel the bottom, you will find the bottom one cooler.
With reverse flow that would be the other way around.

Yes, the water comes to the radiator at the top and goes out from the radiator at the bottom.