A leaking radiator can be a significant problem for your vehicle, potentially leading to engine damage and costly repairs. In this article, we will walk you through 14 steps to help you seal a leaking radiator to prevent further damage and keep your vehicle running smoothly.

1. Turn off the engine: Before starting any work on the radiator, make sure your vehicle’s engine is turned off and cool to avoid burns or other injuries.

2. Locate the leak: Inspect the radiator for any visible signs of leakage, such as damp areas, coolant puddles, or damaged hoses.

3. Check the coolant level: Open the radiator cap (when it is safe to do so) and check if the coolant level has dropped significantly.

4. Clean the affected area: Thoroughly clean the area around the leak with a degreaser or a mixture of water and dish soap to remove dirt and debris.

5. Choose a radiator sealant: Get a high-quality radiator sealant from an auto parts store suitable for your specific radiator type (plastic or metal).

7. Read the instructions: Carefully read the sealant’s instructions to ensure correct application and avoid possible damage to your vehicle.

8. Prepare the sealant: Some sealants need mixing or shaking before use – follow all necessary directions as given by the manufacturer.

9. Apply the sealant: Pour or spray a sufficient amount of sealant around and over the leak area according to manufacturer instructions.

10. Allow to cure: Let the sealant cure for a minimum of one hour, or longer as specified in its instructions.

11. Refill the coolant: Top up your radiator with a 50/50 mix of coolant and water following your vehicle’s specifications.

12. Start the engine: Start your car and let it idle, allowing coolant circulation through your repaired radiator area while checking for leaks.

13. Take a test drive: After idling, take your vehicle for a test drive, paying close attention to fluctuations in temperature and any signs of leakage.

14. Reinspect the radiator: After your test drive, turn off the engine again and wait for it to cool. Visually inspect the radiator and look out for any remaining or new leaks.

15. Monitor the situation: Over the next few days, keep an eye on coolant levels and your vehicle’s temperature to ensure the leak seal holds up.

By following these steps, you should be able to seal a leaking radiator temporarily and prevent further damage to your vehicle. However, it is advisable to have your radiator checked by a professional mechanic as soon as possible for a more permanent solution.