Can I drive a short distance if the car is overheating?

The cautious answer is no. Even a short distance on a badly overheating engine can cause damage that costs many times the price of recovery. Stop somewhere safe and let it cool.

Can I just top the coolant up and carry on?

Topping up once the engine is fully cool may get you moving, but coolant doesn't disappear on its own. If you're topping up regularly there's a leak or a fault behind it that should be found.

Can a mobile mechanic fix a cooling leak at my house?

Frequently, yes — hoses, clips, caps, sensors and thermostats are often doable on site if there's safe space and the part is available. Radiators and water pumps depend heavily on the vehicle.

How do I know if it's the head gasket?

You don't from the driver's seat, and neither can anyone over the phone. There are on-site tests that can indicate it, but confirming it properly is a workshop job.

The car only overheats in traffic — what does that suggest?

It can point to the cooling fan not running when it should, since airflow at speed masks the problem. It's a common possibility, but still needs checking rather than assuming.

Overheating

Car overheating — what to do and who to call

An overheating engine is one of the few faults where what you do in the next few minutes genuinely matters. Continuing to drive a hot engine risks warping a cylinder head or failing a head gasket — turning a hose or a thermostat into a very large bill.

If the temperature gauge is in the red, a coolant warning has appeared, or there's steam from under the bonnet, pull over somewhere safe as soon as you can, switch the engine off and let it cool. Don't open the expansion tank cap on a hot engine — the system is pressurised and the contents can scald.

Once the car is safely stopped, Rolling Mechanics can arrange an independent mobile mechanic to come and look at it where it stands.

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Anywhere within the M25 — and if you're a little bit outside it, we'll still make the effort to reach you.

Signs of an overheating problem

Temperature gauge climbing above its normal position or into the red
A coolant temperature or low coolant warning on the dash
Steam or a sweet smell from under the bonnet
The heater blowing cold when the engine is warm
Coolant puddles or dried residue under the car
The engine running hotter in traffic and cooling down when moving
Repeatedly needing to top up the coolant

Common possibilities

Overheating usually comes down to losing coolant, not circulating it, or not shedding the heat. Common possibilities include:

A coolant leak from a hose, a jubilee clip, the radiator or the expansion tank
A stuck thermostat preventing coolant reaching the radiator
A failed radiator cooling fan or its sensor or relay — classically shows up in traffic
A failing water pump not circulating coolant properly
A blocked or badly clogged radiator
Air trapped in the system after previous work or a top-up
A failing head gasket, which can push exhaust gases into the cooling system

What the attending mechanic can check on site

A cooling system inspection at your location typically covers:

Coolant level, condition and evidence of leaks around hoses, clips and the radiator
Whether the cooling fan runs when it should
Thermostat behaviour as the engine warms
A pressure test of the system where equipment and conditions allow
Fault codes relating to coolant temperature and fan control
Signs pointing at head gasket failure — oil and coolant contamination, exhaust gases in the coolant

How booking a mechanic works, and what you pay

Rolling Mechanics is a booking and introduction service, not a repair garage. There are two separate payments and you'll know both before anything is confirmed:

Send us the vehicle, registration, symptoms and location — a map pin from your phone is ideal
We speak to an independent mechanic we know personally and confirm their expected price for the described work
You pay Rolling Mechanics a separate booking and introduction fee to secure the mechanic. It is not a deposit and it is not deducted from the mechanic's bill
The mechanic attends and you pay them directly for their labour, diagnostics, parts and repair work

What not to do

Don't keep driving 'just to get home' — that's how most head gasket failures begin. Don't remove the pressure cap while the engine is hot. Don't pour cold water into a hot engine; the sudden temperature change can crack components. And don't rely on stop-leak products as a fix, because they can block the very passages the system needs to work.

When recovery or a workshop is the safer option

If the engine has been run hot for any length of time, the real question is whether internal damage has been done — and confirming that needs workshop testing. Head gasket work, radiator replacement on many modern cars, and water pumps buried behind timing belts are workshop jobs. If the car isn't safe to run, the honest answer is recovery. The attending mechanic will say so rather than start something that can't be finished at the roadside.

We'll either get you back on the road, or our experienced mechanics will give you a solution.

Questions we get asked

What we can arrange

Where we cover

Request a mechanic

Call or WhatsApp us with the vehicle, what it's doing and where it is — you can share your location straight from your phone. Prefer to type it out? Use the request form on the homepage and we'll come back to you.

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Rolling Mechanics is a trading name of Symatec Ltd (company number 17217755). We introduce customers to independent mobile mechanics and charge our own separate booking and introduction fee — see our terms & conditions.