If you find a leak in your radiator or engine block - and if the leak is just a small one (a couple of drops a day, with no need to add water more frequently than once a week) you may want to try a sealer, or stop leak, as it's sometimes called, before you head for a repair shop.
You add sealer to the liquid in your cooling system. It circulates around with the water and coolant, and when it finds a hole where a leak is occurring, it plugs it up.
You can purchase several kinds of sealers. The trick is to choose the one that does the best job without gumming up the cooling system. Ask for advice at the auto parts supply store. It's especially important that the sealer be compatible with your coolant. Sealers are usually added through the radiator fill hole. Some coolants have a sealer built in, but these are rarely strong enough to deal with established leaks. If you try a sealer and the leaks recur in a couple of days, get professional help.
On the other hand, if the leaks occur in any of the hoses, replacing the hoses is quite simple.
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