I would settle for upper and lower Radiator hoses and Thermostat, only others i know of are on the oil filter cooler and i would not mess with them unless they were leaking! I will do a search and see if i can come up with the 2 you were talking about? The heater hoses can also be replaced i think! I will explore!
pdf explains how to drain block and use no water to drain block, and use only specd Toyota Coolant that is in you owners manual.
If your coolant is 5 years old it's time to change and Dealership has a pre-mix 50-50 Super Long Life that ya should use!