Repairing car radiator leaks with a radiator leak sealant

K-Seal car radiator sealant will permanently fix most car radiator leaks with ease – saving you time and money taking your vehicle to a mechanic.

Find a stockist

What is a car radiator?

The main function of a car’s radiator is to cool the internal combustion engine that powers the vehicle – not to heat it up!

A car radiator highlighted in an exploded diagram of a car engine.
A car radiator is usually located at the front of a car’s engine.

The radiator is designed to remove the heat generated by the engine to the air in order to regulate the engine temperature and prevent overheating. If the engine overheats, it will stop working, leading to a costly replacement.

To avoid this, it’s critical to understand how your car radiator works so that you can quickly identify any common radiator leak symptoms, such as radiator hissing and frequent engine overheating.

How does a car radiator work?

An engine needs to burn fuel to run, a process which naturally produces an immense amount of heat. The engine therefore needs to be cooled as much as possible so that the pistons do not break down and destroy the entire system.

This is where the car radiator, which is part of the engine’s cooling system, comes in.

K-Seal will permanently car radiator leaks
A car radiator.

How your car radiator cools the engine

  1. The coolant in an engine is passed through tubes inside the car radiator, where heat it has absorbed from the engine is dissipated into the atmosphere, before the coolant returns to the engine.
  2. Coolant enters the pipes in an overheated state,causing it to become highly pressurised (aided by turbulence inside the car radiator pipes).
  3. This causes the car radiator cap to open at a predetermined pressure point.
  4. The heat is released, allowing any excess coolant to escape into an overflow tank attached to the side of the radiator.
  5. That coolant is then returned to the car radiator when its temperature has sufficiently lowered.

Car radiator and cooling systems vary slightly from model to model (especially in older cars versus newer models), but this is the process that the majority of systems employ.

Why do car radiators fail?

The main reason for car radiator failure is a coolant leak, which can lead to the cooling system failing.

If the coolant has not been checked or topped up properly, the radiator, hoses and hose connections will become clogged and begin to rust. Over time, such corrosion will cause small holes or ‘pinhole leaks’ to develop in the car radiator. This will result in engine coolant loss, and a need for car radiator repair – or even the costly complete replacement of your radiator.

How to repair car radiator leaks

If you’ve identified a common symptom of a leaking car radiator, act quickly to get it fixed. To start with, you need the best radiator leak sealant you can get your hands on.

Find your local supplier and grab yourself a bottle of K-Seal. A highly reliable car radiator leak sealant, K-Seal products will permanently repair and fix most leaks in the radiator or radiator casing – putting a stop to those troublesome pinhole leaks in your car radiator.

How to use radiator leak sealant

Using K-Seal as a radiator stop leak sealant is simple:

  1. Shake the bottle.
  2. Put car radiator leak sealant in the expansion tank or radiator.
  3. Run the engine up to operating temperature.

The liquid formula will make its way around the engine and fill any pinhole leaks, holes and cracks in your radiator or cooling system to fix it, permanently. K-Seal is also a scientifically tested formula, meaning there is no risk that this radiator leak sealant will cause overheating.

K-Seal being poured to fix a car radiator leak

Why you should choose K-Seal to fix your leaking car radiator

Although the car radiator may be one of the cheaper components in the car engine, it can still cost hundreds to have it repaired or replaced.

Scientifically tested, K-Seal is the #1 head gasket sealer and radiator leak repair, able to do the following:

  • seal holes up to 0.635mm in diameter
  • seal slots or crack up to 0.254mm wide by 12.7mm long

Just one bottle of K-Seal could save you a lot of money by fixing an engine coolant leak instead of you having to replace the parts.

Grab a bottle of K-Seal today

Could other parts of my engine be affected?

Although your car radiator could be the source of your engine troubles, it might not be the only part of your engine you need to take a look at.

Select an engine part in the interactive diagram below to explore your engine and the important components that keep everything ticking over.

Click on the engine components below for details
More Info »

Still not sure what the problem is? Try our 60 second problem solver to quickly identify what the issue is based on your symptoms.

K-Seal Is The #1 Solution For Engine Radiator Leak Repairs

Expert Advice

Head Gasket Failure? Cracked Head or Block?
Leaking Radiator?

Expert Advice

Where to buy K-Seal

Have any of these symptoms? K-Seal could save you thousands on a workshop repair. Search for a stockist today!

Find a stockist