The radiator can be flushed with water running continuously. This will flush out any loose particles. The only way to completely clean the radiator is to have is professionally cleaned in a chemical bath.
If the heater core is leaking, the only fix is to replace it. If you are referring to the A/C condenser drain line, then just unclog it.
Have the heater core flushed. It might be plugged up with corrosion and dirt.
Corroson can clog the fine tubes in the radiator and heater core, which cools the engine, thus blocking the flow of coolant which preventing the radiator from doing it's job.
The heater core can be flushed out and hopefully be unclogged. A water hose can be hooked to the heater core hoses, and water flushed through to clean the core out.
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To clean radiator corrosion, first make sure the radiator is cool. Remove the cap, and place a bucket under the radiator to catch the water. Open the drain cock on the bottom of the radiator. When empty, close the drain cock and pour a coolant flush into the radiator. Top it off with water. Replace radiator cap and run the engine for 10-minutes, with the heater going full blast. Turn the engine off and wait until the engine has cooled off. Drain radiator once more. Then, fill the radiator with a 50/50 mixture of engine coolant and water.
Heater cores are usually well protected from mechanical damage but they can be damaged by corrosion and sediment deposits. If you change the coolant in accordance with the manufacturer's recommendations you will extend the life of the heater core, the water pump and the radiator.
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dex-cool states 5 years or 150.000 miles use only dex-cool or premature corrosion to heater core or radiator
Corrosion.
the seepage from the radiator. A rotted/damaged radiator core, A split seam between the radiator core and the tank, A cracked tank, A loose hose clamp, A bad radiator cap.
It's a much better idea to replace it. You can try the radiator flush, but no guarantee.