Replacing hoses is usually pretty easy and inexpensive, with two caveats: Make sure that both ends of the hose are accessible. Some heater hoses disappear through the firewall and under the dashboard.

When buying a new hose, don't forget to buy new hose clamps. They should be large enough to fit the outside diameter of the hose. Clamps are so inexpensive that you should make it a habit to replace ...