Your radiator keeps your engine at a safe operating temperature by dispersing heat and circulating coolant effectively. If it fails, a common symptom you’ll notice is an overheating engine or smoke/steam billowing from the bonnet. This may be accompanied by the temperature warning light on your dashboard.

If you’ve noticed any of the following, it’s time to book a radiator repair near you:
Low coolant levels
A brightly coloured leak under the car
Rust or visible damage on the radiator when you inspect the engine bay
Your engine overheating
Steam coming from under the bonnet
White exhaust smoke
Your heater not working as well as it should
Overheating can be a sign of a radiator problem, so you should book a repair as soon as you notice smoke/steam coming from under the bonnet.
A car’s cooling system is quite complex, and a failing radiator may not be your main problem.
A coolant leak, inefficient or low-quality coolant and problems moving coolant around the system can all cause cooling problems.
If you notice a brightly coloured puddle under your car (usually green, pink or orange) or low coolant levels within the reservoir, there’s likely a leak somewhere in the system which needs fixing.
Likewise, if your coolant isn’t as brightly coloured as it should be or there are bits floating in it, you should book a coolant change as soon as possible.
What your radiator needs depends on how serious the problem is:
Repair for minor issues, such as a small leak
Coolant flush if the coolant is dirty or the radiator is a bit clogged
Replacement for major damage, heavy corrosion or a significant leak
Most car radiator repairs cost somewhere between £150 and £350. If your radiator needs replacing, expect to pay somewhere around £270. The price will vary depending on your car and the extent of the problem.
For a more detailed breakdown, see our guide to coolant leak repair costs.
Typical UK costs based on published industry estimates as of 6th October 2026. Prices are representative figures only as costs vary depending on your make and model, the parts used and your chosen garage. Enter your reg and postcode to compare local garages for your exact car.
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Prevent overheating by changing your car's coolant every 2-3 years.
Compare Coolant Change Prices →Expert advice to help you understand your radiator repairs better
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