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▷▷ 2021 ▷ How to plug the radiator leak with pepper

5 julio, 2021

How to plug a radiator leak with pepper

by Wade Shaddy

girl repairs car image by Rina from

Old school auto repair jobs. Some emergency repairs are still being used. One of them is the use of black pepper to seal small radiator leaks. When black pepper is introduced into the system, the small particles travel to the leak where they expand and seal the leak. The pepper does not deteriorate and will seal the leak until a professional can repair it.

Step 1

Remove the radiator cap after the engine cools down.

Step 2

Pour a tablespoon of black pepper on the radiator. Do not put it in the plastic backup tank, put it directly on the radiator through the opening of the radiator cap. Fill the radiator with a 50/50 mixture of water and antifreeze. Drive the car for fifteen minutes or until the temperature is at its normal operating level. Turn off the car. Wait another 30 minutes for the particles to swell.

Step 3

Open the hood and look around the radiator where you had a leak. Get down and look under the car. If you see any signs of leakage, add one more tablespoon of black pepper.

Drive the car normally for about 30 minutes to seal the leak.


  • Of course, ground black pepper works best, the larger the particles, the better.


  • Never, ever try to remove the cap from a hot radiator. If the radiator continues to leak, you may have a faulty hose or a leak that requires professional repair.

Articles will need

  • 2 tablespoons of black pepper
  • 1 gallon 50/50 antifreeze / water

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