It is not so hard to check the function of a water pump and thermostat.

If there is a large difference in temperature between the radiator inlet en output and the car is running hot, the circulation is bad.
----------------------------------------------
If the coolant circulation good:

If there is little difference in temperature either the radiator is not good or you have a restricted airflow.

High temperatures at low speed and normal at high speed mean that the fan clutch is not working.

High temperatures at high speed indicate a bad radiator of blocked airflow.

Rob