First thing to do: check for holes in radiator: if there are any you will see red/rust/white stains ...If this is the case, you need a new radiator: but there are a number of fixes: Radweld/Barrs Leaks/etc which may work.
I fthe radiator looks ok, look for splits in hoses and leaks around joints. Fix: replace..
Then you could have a faulty radiator cap: only test is to buy another.
Or a faulty thermostat.
Or a failed cylinder head gasket. - oil in water..
Or a corroded up radiator (test by carefully seeing if radiator is hot all the way daown.. if not it's blocked)..
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