Radiator Hose repair & replacement made easy

How does a radiator hose work?

The radiator hoses transport coolant throughout the engine and radiator to regulate temperature and keep the engine from overheating. There are typically two main radiator hoses in a vehicle. The top radiator hose connects the top of the radiator to the engine, carrying coolant from the radiator into the engine, where it helps cool the engine components. The lower hose connects the engine to the water pump, transporting heated coolant from the engine back to the radiator to cool down.

These hoses are crucial for maintaining a closed-loop cooling system that keeps your engine at the proper temperature. Without functioning radiator hoses, your engine can overheat, causing serious damage.

What does a radiator hose replacement job involve?

When your radiator hose needs replacing, the mechanic will generally follow these steps:

• Look over the hoses, clamps, radiator, and nearby components to confirm the source of the leak or damage. If the hose is swollen, cracked, or leaking, replacement is necessary.
• Safely drain enough coolant from the radiator to prevent spillage when the hose is removed.
• Loosen or remove the clamps and take out the damaged radiator hose. If clamps are corroded or weak, they’ll usually be replaced too.
• Fit a new hose and secure it with new clamps if needed. Add fresh coolant or reuse clean coolant if it’s still in good condition.
• Remove any trapped air pockets from the cooling system to ensure proper circulation and prevent overheating.
• Run the engine to operating temperature, check for leaks, and confirm that the system is holding pressure and cooling properly. If the vehicle shows any overheating issues, the mechanic might also scan the ECU for codes or check other components (like the thermostat, radiator, or water pump).

How do I know when I need a radiator hose replacement?

Radiator hoses carry coolant between the engine and radiator, so if they fail, your car can quickly overheat. Here are some common warning signs:

• Steam from under the hood – If you see steam coming from the engine bay, a leaking or cracked hose could be letting coolant escape.
• Visible damage – Over time, hoses can become cracked, brittle, or swollen. If you spot this during a quick look under the hood, it’s a sign they should be replaced.
• Coolant leaks – Puddles of coolant under your car or damp spots around the hoses mean there’s a leak.
• Overheating or weak heater performance – A leaking hose can lower coolant levels, which may cause the engine to run hot or reduce heat inside the cabin. These symptoms can lead to engine overheating, so it's important to address any issues with your radiator hoses as soon as possible.

Can the radiator hose be repaired?

If you've spotted a leak or damage to your radiator hose, you might be wondering if it can simply be patched up or if it needs to be replaced. In some emergencies, a small leak in the radiator hose can be temporarily fixed with radiator sealant or specialist tape. This might get you safely to a garage, but it’s not a long-term solution and shouldn’t be relied on for regular driving. If a radiator hose is cracked, swollen, brittle, or visibly leaking coolant, the safest and most effective option is to replace it.
Driving with a damaged hose can lead to overheating and serious engine damage, so it’s not worth the risk. Radiator hoses are inexpensive to replace and play a vital role in your cooling system. While repairs might work in a pinch, replacing a faulty hose is the most reliable way to keep your engine running smoothly.

Can I replace the radiator hose myself?

It’s not quite as simple as just pulling the old one off and sliding a new one on. Radiator hoses are accessible and don’t require any complex tools, but mechanics have to extra careful when handling coolant and ensure the system is properly refilled and bled afterward.
If your radiator hose is easy to access and you have some technical or DIY experience, this could a small weekend prohect. However, if space is tight under the bonnet or you're unsure about handling coolant safely, we highly recommend you book a mechanic. A poorly fitted hose can cause coolant leaks, overheating, and potentially serious engine damage, so if in doubt, let a professional take care of it.

How much does a radiator hose replacement cost?

The cost of replacing a radiator hose typically averages around £115, though prices can range anywhere from £90 to £140 depending on your vehicle. The exact cost will depend on the make and model of your car, and whether your manufacturer recommends any specific replacement parts. Labour charges can also vary depending on your location and the type of mechanic you choose. If you're comparing options, mobile mechanics may offer lower labour rates than main dealerships. Use our free price estimator tool to find out what you could save by having your radiator hose repaired by ClickMechanic!

What does a ClickMechanic radiator hose replacement quote cover?

Unless otherwise stated, the quote will cover:

• The cost of the radiator hose
• Coming to you
• Fitting of the parts
• Disposal of the old parts (unless you request to keep them)
• VAT (if applicable)
• 12-month parts and labour warranty

Can a mobile mechanic replace the radiator hose?

A mobile mechanic can replace a radiator hose, and in many cases, this can be a convenient and cost-effective option. Mobile mechanics are fully equipped with the necessary tools and expertise to carry out this repair at your home or workplace, saving you the time and effort of visiting a garage. This service is especially useful if you can't drive your car due to the issue or if you prefer the convenience of having the repair done at your location.

However, while mobile mechanics can replace radiator hoses, more complex problems related to the radiator itself, such as internal leaks or significant damage, may require a garage visit for a more detailed inspection and repair. In such situations, the mobile mechanic will assess the problem and advise you on the best course of action. ClickMechanic offers free collection and delivery to and from the garage if the vehicle is drivable.