Car radiator leak repairs: How much do they cost?

Left unchecked, a leaking car radiator could cause serious damage to your engine, forcing you to pay out up to around £2,000 in repairs. Find out more about car radiator repair costs, and how much money you could save using K-Seal.

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Why is it important to have a functioning car radiator?

Your car radiator’s primary function is to keep your engine cool, preventing it from overheating. Something as “harmless” as a small radiator leak can develop into a serious issue if left untreated.

An image of a car radiator being held up in front of an open car bonnet.
An image of a car radiator being held up in front of an open car bonnet.

Issues that can occur as the result of an ignored radiator leak include:

An overheated engine

With coolant leaking out of the car radiator, there will be restrictions on your vehicle’s ability to regulate its temperature. This may cause the engine and radiator to overheat.

An overheated engine will cause the car to become difficult to drive—you may experience notable power drops, which could be a big problem on busy roads and highways.

A cracked engine block

The heat and pressure of an overheating engine due to a radiator leak can cause the engine block to crack or even melt.

A cracked engine block is an expensive repair that has no quick fix. If an untreated car radiator leak causes engine block damage, you could be over £2,000 out of pocket and off the road for some time.

A blown head gasket

If not treated quickly, a radiator leak can also lead to a blown head gasket.

A blown gasket will allow coolant to enter the car’s cylinders, potentially leading to severe engine damage. Head gasket failure can prevent the engine from lubricating properly, resulting in a number of issues.

How to identify a car radiator leak

Letting a radiator leak worsen may lead to a costly outcome, and could possibly put both you and your vehicle at risk. Catch leaks early by looking out for these common radiator leak symptoms:

  • Pools of coolant leak under your car
  • A frequently overheating engine
  • Coolant levels which drop rapidly

At the first sign of any of these symptoms, grab yourself a bottle of K-Seal for a quick and easy fix.

How much will a radiator leak repair cost at a garage?

The cost of repairing a car radiator will vary depending on whether you do it yourself or employ a professional mechanic to do the job.

If you choose to flush the radiator yourself, you’ll be able to keep costs down and just pay for the new coolant. This is usually around £40. If you go to a mechanic, the cost will rise to around £70 depending on your car make and model.

If extensive damage has been done, however, replacing a car radiator can set you back anywhere between £250 and £700. Labour costs will cover the mechanic checking for leaks, removing the radiator, a whole system flush, and the installation of a new radiator.

An image of a spanner being used to remove a car radiator during a radiator leak repair.
A spanner being used to remove a car radiator during a radiator leak repair.

Although these high costs may be off-putting if you feel that your engine is still functioning efficiently, it’s important to address any issues as soon as possible to prevent further, potentially dangerous damage.

How can the cost of radiator leak repairs vary?

Repairs required as a result of radiator leaks can vary from relatively cheap ‘quick-fixes’, to eye-watering engine replacements.

Minor repair costs

Minor repairs triggered by the side effect of a coolant leak will incur minimal costs. Heater hose replacement, thermostat replacement, and cooling fan wiring repairs will on average come to £75 or less.

Major repair costs

Major repairs and extensive engine work will be more expensive due to the nature of the damage. Water pump replacement, changing the heater core, car radiator replacements, and head gasket replacements can range from £350–£1,250.

Engine replacement

A badly overheated cylinder will need to be pressure tested and inspected for warping and engine block cracks or melting. These issues can lead to a complete engine rebuild and cost several £1,000 to fix.

Save on radiator leak repair costs with K-Seal

Using K-Seal to fix a radiator leak could end up saving you thousands of pounds. Rather than wait until an item needs replacing, avoid further damage and costs by recognising the signs of a car radiator leak and acting quickly.

K-Seal being poured into a raditor

With K-Seal, you eliminate the risk of further engine damage and overheating. Our scientifically tested blend of chemicals and micro-fibres circulate through your vehicle’s engine, permanently filling holes, leaks, and cracks in the radiator or cooling system.

All you need to do is:

  1. Find your local K-Seal supplier and grab a bottle
  2. Shake and pour this trusted radiator stop leak into the coolant reservoir or radiator
  3. Run the engine to its operating temperature, and go!

Grab your bottle of K-Seal today

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!

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