If your engine is getting hot, the radiator is the first thing to check. It moves heat from the engine to the air, keeping everything running smooth. A weak radiator can cause overheating, loss of power, and costly repairs. Below you’ll find the most useful info to spot trouble and choose the right part.
Look for steam coming from the front of the car, a sudden rise in the temperature gauge, or a sweet smell of coolant. You might also notice coolant leaking under the vehicle or the engine taking longer to warm up. These clues usually mean the radiator’s core is cracked, the hoses are loose, or the fan isn’t working.
Another red flag is a thick, oily sludge inside the coolant. That shows the radiator’s internal passages are blocked and need a proper flush. Ignoring it can damage the water pump and lead to a full engine overhaul.
Our detailed guide "Car Radiator Cost (UK 2025)" breaks down the numbers: a standard aluminium radiator for a small hatchback runs around £80‑£150 for the part alone. Luxury Italian models can push £300‑£600. Labour adds another £70‑£150 depending on the garage and how hard the job is.
Taxes, waste disposal, and a coolant flush usually add £30‑£50 more. If you DIY, you can save the labour fee but you need the right tools and a safe place to work. The guide also shows real‑world quotes so you can spot a rip‑off.
When you shop, compare OEM (original equipment manufacturer) parts with reputable aftermarket options. OEM guarantees a perfect fit but costs more. Quality aftermarket radiators from trusted brands give similar performance for less money.
Before you buy, check the radiator’s specifications: core dimensions, number of rows, and whether it’s a single‑pass or dual‑pass design. The right size fits your engine’s cooling demand and avoids overheating.
Don’t forget the supporting parts – thermostat, hoses, and the coolant reservoir. Replacing them together can prevent future leaks and extend the life of your new radiator.
In short, a radiator replacement isn’t just about swapping a metal box. It’s about keeping the whole cooling system healthy. Use the cost guide to budget, order the correct part, and follow the flush steps to get the best performance.
Need more help? Browse our other articles for tips on coolant flushes, fan belt checks, and how to choose the right radiator for an Italian car. Keeping your car cool is easier when you know what to look for.
