Stopping the Leak

• 1). Locate the leak in the radiator cooling fins by running the car up to operating temperature and observing the leak location.
  
  
• 2). Shut off the car and allow it to cool down completely.
  
  
• 3). Place your drip pan under the radiator to catch any remaining coolant coming from the leak. This may take some time.
  
  
• 4). Use your shop towel to cover your hand and turn the radiator cap counter clockwise until it comes loose. Remove the cap.
  
  
• 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.
  
  
• 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.
  
  
• 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.