Radiator hoses need to be replaced regularly. As rubber gets exposed to extreme temperatures, it becomes brittle, and the likelihood of leaks goes up. A leaking radiator hose not only causes you to lose coolant, but it can also cause your engine to overheat.
When it comes to small parts that can make a big difference, fresh hoses are high on the list. Changing out your radiator hose is easy and inexpensive, and can save you big money in the long haul.