How to Fix a Car Radiator

If you discover engine coolant running out from under your car, you may have a radiator leak. If the leak is small, you can probably repair it using the tips given here.

You will need

  • Radiator hose
  • Duct tape
  • Mustard powder
  • Pepper
  • Stop-leak coolant
  • Welding equipment and expertise
  • New radiator

Step 1 Add stop-leak coolant Add a stop-leak coolant to the radiator for a more long-term fix. Be sure to follow the manufacturer’s directions.

Step 2 Add mustard or pepper Try adding 2 tablespoons of mustard powder or ground black pepper to your engine coolant if you have a small radiator leak. The mustard or pepper will migrate to the leak and form a temporary seal.

Step 3 Consider welding Consider welding cracks or multiple radiator leaks if you have the expertise and equipment. Otherwise, you will probably be better off replacing the radiator. Enjoy a stress-free ride.

Step 4 Check radiator hose Pull the car over to the side of the road if you are driving it, and check for a broken radiator hose. In an emergency, you may be able to repair it with duct tape.