How to repair a radiator leak – a comprehensive guide

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There are multiple reasons for engine heating and one among them can be a radiator leak. Radiator is the start of your car’s cooling system. Radiators can develop leaks in several places. This includes the hoses, seams, tubes, and cores. Without the proper working of radiator, your car engine will quickly over heat. This is something everyone wants to avoid at all costs since overheating can cause extensive engine damage.

The best way to stop the leakage is to replace the radiator. However there are ways to temporarily fix the leaking. These strategies come in handy during emergency situations:

Materials needed to fix radiator leakage

  • Protective gloves
  • Rags
  • Safety glasses
  • Welding or soldering equipment (optional)

Locate the leak: Before you do anything else, make an attempt to locate the leak. There are many places coolant leaks from, so you want to make sure it is actually coming from the radiator. If you are not able to do so naturally, use the pressure tester. This pressurizes the liquid without the engine ‘ON’.

Fix the leak: Once you have found the leak, you should determine the best way to fix it.There are a several ways to temporarily do this. These include adding a bottle of cooling system sealer, an egg, black pepper or epoxy glue. In some cases, the radiator can also be soldered or welded.


Many repairs to a leaking radiator are temporary fixes. The only permanent and safe repair is radiator replacement by a trained professional. If you added some form of stop leak to your cooling system, don’t forget to tell your technician.

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