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When a radiator hose is leaking, it needs to be replaced. Most new vehicles have formed hoses, which means that a hose specific to that particular vehicle must be obtained. This is not difficult because most auto parts stores carry a wide selection of hoses, along with hose clamps and coolant, which should also be replaced at this time. Be prepared to give basic information about your vehicle, including the year, make, and model. In some cases, they may ask for the vehicle identification number, which is located on the registration card.
Place a container of approximately five gallon capacity under the radiator drain and open the valve. When the coolant stops flowing, loosen the clamps on each end
of the offending hose. Remove the hose and discard it. After sliding the new hose clamps loosely on the ends, install the replacement in its place. Next, properly
position the clamps and tighten them securely. Using the new coolant, refill the radiator, install the cap, and start the engine. Idle the engine for several minutes
to cause the engine thermostat to open. Then, remove the cap and check the level. It is normal for this to be low at this time. If so, replenish the system; reinstall
the cap, and double check the hose clamps. At this point, the only thing left to do is to properly dispose of the used coolant.
While the proper way to repair a radiator hose in most instances is to replace it, as outlined above, there are rare occasions in which an emergency repair may be
made by cutting the damaged part of the hose off and clamping the remainder to the original starting point. This is not recommended as a permanent repair. Great caution
must be exercised in doing this, as it is likely that the engine and escaping coolant will be hot.
