On models equipped with an electric cooling fan, disconnect the negative battery cable or fan motor wiring harness connector, before replacing any radiator/heater hose. The fan may come on, under certain circumstances, even though the ignition is
Upper and lower radiator hoses along with the heater hoses should be checked for deterioration, leaks and loose hose clamps at least every 15,000 miles (24,000 km). Early spring and at the beginning of the fall or winter, when you are performing other maintenance, are good times to perform the inspection. Make sure the engine and cooling system are cold. Visually inspect for cracking, rotting or collapsed hoses, replace as necessary. Run your hand along the length of the hose. If a weak or swollen spot is noted when squeezing the hose wall, replace the hose.
Fig. The cracks developing along this hose are a result of age and hardening
Fig. A hose clamp that is too tight can cause older hoses to separate and tear
Fig. A soft, spongy hose like this is identifiable by the swollen section near the clamp.
Fig. Debris in the coolant can weaken the hose from the inside