FixMyCar discusses how much you can expect to pay for a car radiator repair.
Book a radiator repair nowEllie Dyer-Brown
Friday August 01 2025
4 min read
The radiator is part of a car's cooling system, which keeps the engine at a safe temperature. This guide discusses common radiator problems, what symptoms to look for and average repair costs.
Just like the radiators in your house, car radiators are designed to disperse heat. However, while house radiators aim to heat rooms up, in cars, the purpose is to cool things down.
Coolant travels through passages in the engine, where it absorbs heat. It then goes to the radiator, which dissipates heat into the atmosphere.
The average price for a car radiator repair is £220.14, according to FixMyCar's data.
One of the most common causes of radiator issues is stones and debris damaging the radiator fins and causing a leak. The cost of a repair can vary depending on the complexity of the job - radiators are sometimes coupled with air con condensers and rad fan packs. Removing parts from the front of the vehicle to access, remove and replace the radiator takes time.
Matt Wrankmore
Head of FixMyCar's Garage Network
Important: The cost of some repairs is difficult to estimate without seeing the vehicle first. If you receive a very low quote price, it may be for an initial diagnostic test to investigate the problem. You can message garages directly on our platform to confirm what’s included in the quoted price.
Common symptoms of a faulty radiator include:
Leaking coolant
Visibly damaged or bent radiator fins
Rust on the radiator
Sludgy or discoloured coolant
Here are a few of the most common radiator issues.
Hose leaks are the most frequent source of radiator trouble. These parts of the cooling system are under immense pressure, which can eventually cause them to degrade or come loose. The radiator can also develop leaks, which is a bigger problem.
Air, metal and liquid can be lethal for cars, leading to rust. These elements are all present in the cooling system, so it's hardly surprising that corrosion seriously threatens the radiator's health. Doing a coolant flush with a radiator cleaner every 20,000 miles is an excellent preventative measure.
Mineral deposits can build up over time, creating gunk in the radiator that stops it from doing its job efficiently. If your car is overheating but you can't spot any leaks or visible signs of corrosion, it could be due to gunk. Again, this is something you can prevent by doing a coolant flush.
Another part of modern coolant systems is an electric fan. It draws air into the radiator to keep the car cool while idling or driving at low speeds. When it breaks, you'll notice your engine starts overheating, specifically when idling.
If the thermostat (pictured below) or water pump fails, the radiator won't be able to do its job correctly, and your car will overheat.
Is there something wrong with your car radiator? Whether you need a repair or replacement, FixMyCar can help you find the right garage at the right price.
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Ellie is FixMyCar's Content Manager. She has over three years of experience writing about cars and regularly collaborates with automotive experts to provide trustworthy advice for drivers that is easy understand. Her work has been featured in Yahoo! Finance, iNews, The Daily Express and The Sun. She has a BA in English literature and an MA in creative writing from Durham University. Outside of work, Ellie follows F1 and eagerly awaits Ferrari's next era of dominance in the sport. She drives a Suzuki Swift.
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