How to Stop Radiator Leaks
A radiator keeps the engine cool and operating smoothly. Without the radiator the engine would overheat and seize up. Leaks in the radiator should be addressed as soon as possible. Quick fixes are available at most auto parts stores.
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Things You'll Need
- 4 gallons of engine coolant
- Stop-leak product
- Safety glasses
- Shop towels
- Drip pan
Instructions
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Stopping the Leak
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1
Locate the leak in the radiator cooling fins by running the car up to operating temperature and observing the leak location.
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2
Shut off the car and allow it to cool down completely.
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3
Place your drip pan under the radiator to catch any remaining coolant coming from the leak. This may take some time.
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4
Use your shop towel to cover your hand and turn the radiator cap counter clockwise until it comes loose. Remove the cap.
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5
Start the engine and allow it to reach operating temperature. You will notice the coolant level dropping when the engine has reached operating temperature.
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6
Pour the stop-leak material into the radiator and replace the radiator cap. Use the fill/overflow container to add coolant to the radiator until you have reached the fill line.
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7
Allow the engine to run the amount of time prescribed by the stop-leak product and check the leak area again. If the leak is stopped you are ready to roll. The best thing to do is to take your car to your favorite mechanic and have the radiator fixed properly. If the leak does not stop, it is time to call the wrecker.
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Tips & Warnings
Never remove the radiator cap before the engine has completely cooled. Engine coolant is usually over 200 degrees Fahrenheit and can cause severe burns.
Do not repeat the process more than once as this will permanently clog up the radiator and do damage to the engine.
Wear your safety glasses at all times during this procedure. Severe burns are a serious risk.
