Winter used-car checks before a cold snap

Cold-weather and winter-storm warnings have been issued in parts of the UK this month, and a cold snap is the point at which a weak car shows its weaknesses. A battery that started every morning in October can fail on the first frosty day. A tyre that looked fine in summer can lose grip on a wet, cold road. This guide sets out the checks that matter most before a freeze, for the car you already own and for one you are thinking of buying.

Start with the battery

Cold reduces how much power a battery can deliver, and it makes the engine harder to turn over. Older batteries are most at risk. If the car starts slowly, the dashboard dims when you turn the key, or the battery warning light flickers, get it tested before the cold arrives. Many garages and motor factors will test a battery for little or no charge.

Check the terminals as well. A white or green crust around the posts reduces the connection and can stop a perfectly good battery from starting the car. Clean it carefully and make sure the clamps are tight.

Tyres: tread, pressure and the cold

Tyre pressure drops as the temperature falls, so a tyre that was correctly inflated in a warm spell can be under-inflated when the cold arrives. Check the pressures when the tyres are cold, using the figures in the handbook or on the driver’s door frame, and include the spare if the car has one.

Tread matters even more on wet and icy roads. The legal minimum in the UK is 1.6mm across the central three-quarters of the tyre’s width, measured around the whole circumference of the tyre. Many drivers aim to replace tyres well before that limit in winter, because grip falls off gradually. Look for uneven wear, bulges, cuts and damage to the sidewall, not just the depth.

Screen wash, wipers and lights

Top up the screen wash with a product rated for winter conditions. Plain water freezes, and a bottle of summer wash can leave a film that smears in low sun. Check the wiper blades for cracks and streaking, and replace them if they leave lines on the glass.

Walk round the car and check every light: headlights on dipped and main beam, indicators, brake lights, reversing lights and the fog lamps. A blown bulb is cheap to replace, but it is an easy way to fail an MOT or be stopped by the police.

Heater, demister and heated seats

Turn the heater and the demister on fully before you set off. Air should warm up within a reasonable time, and the windscreen should clear quickly from the bottom edge upwards. If the demister is weak, the car will be hard to see out of on a cold morning, and that is a safety fault rather than a comfort issue. Check the rear-window heater and any heated mirrors or seats too.

Buying a used car in winter

Cold weather is a good time to be cautious about a used car, because a car that is cold can hide problems. Ask the seller not to warm the engine before you arrive, and ask to start it from cold yourself. Listen for rough idling, knocking that fades as the engine warms, or any smoke from the exhaust that does not clear after a few minutes.

Use the official checks before you travel. The GOV.UK guidance on checking a used vehicle explains what to look for, the recall checker shows whether any manufacturer recalls are outstanding, and the DVLA vehicle enquiry service confirms the tax and MOT status. Our buying a used car guide sets out the full order of checks.

Ask for the service history, and check the MOT history for advisories that were noted but not fixed, particularly on tyres, brakes and suspension. A car with a long list of recurring advisories may need more work than the price suggests.

Insurance and running costs

Before you drive a car home in winter, confirm the insurance is in place and that it starts on the day you collect it. Check the tax status as well, because an untaxed car cannot legally be driven on the road. The narrow exceptions, such as a pre-booked MOT test, are set out in the official guidance.

Winter also adds to running costs. Heated screens, more frequent battery problems and a tyre change before the season can all add to the first year of ownership. Build those into the budget before you agree a price.

If a car fails the cold-weather test

If a used car will not start reliably, has a weak demister or tyres close to the legal limit, tell the seller in writing before you agree the sale and ask them to fix the fault or reduce the price. If the car is already yours, get a quote from a garage before the first hard frost, because repair slots tend to fill up as the weather turns.

Key points

• Test the battery and clean the terminals before a freeze, because cold reduces battery power.
• Check tyre pressures when cold, and look at tread and sidewalls as well as depth. The legal minimum is 1.6mm.
• Use winter-rated screen wash, replace worn wiper blades, and check every light.
• Confirm the heater and demister work properly before you drive, since poor visibility is a safety fault.
• When buying in winter, ask to start the car from cold, check the recall and DVLA records, and review the MOT advisories.
• Confirm insurance and tax before the car is driven on the road.

Information is as of 13 November 2026. Tyre and MOT rules apply across the UK, but check the current GOV.UK guidance for any changes before you rely on a figure.