As temperatures rise across the UK, many motorists will be heading off on road trips, family holidays and days out. But while the warmer weather is welcome, it can put extra strain on your vehicle, increasing the risk of a breakdown.
According to the RAC, vehicle breakdowns can rise by around 20% during heatwaves, with high temperatures and long-distance journeys placing additional pressure on key components such as the battery, tyres and cooling system.
Nationwide Vehicle Contracts highlights four common causes of heat-related breakdowns, the warning signs to look out for and how to prepare your car before setting off.
While winter is often considered the toughest season for vehicles, summer can be just as demanding.
High temperatures, congested roads, longer journeys and heavier loads all place extra strain on essential components. Without proper maintenance, small faults can quickly become more serious, increasing the risk of a breakdown.
Mark Smith, Director at Nationwide Vehicle Contracts, says drivers shouldn't underestimate the impact hot weather can have on their vehicles.
“What makes summer particularly risky is that this strain often coincides with long-distance journeys and heavier vehicle loads, which can expose underlying issues that might otherwise go unnoticed”
While battery failures are often associated with winter, hot weather can be just as damaging.
High temperatures can cause battery fluid to evaporate and accelerate wear on internal components. Combined with stop-start traffic, frequent short journeys and increased use of air conditioning and other in-car electronics, this can increase the risk of a flat battery.
Replacing a car battery, including fitting, can cost up to £400.
Warning signs to look out for:
- Slow engine starting
- Dim or flickering headlights
- Electrical systems behaving unexpected
Hot weather places extra strain on your engine, making the cooling system essential for keeping your vehicle running safely.
If coolant levels are low or there's a fault with the cooling system, your engine can overheat quickly. According to AAA, cooling system problems account for around 11% of serious breakdowns requiring towing.
Depending on the cause of the fault, cooling system repairs can cost up to £500.
Warning signs to watch for:
- A rising engine temperature gauge
- Steam coming from under the bonnet
- Warning lights appearing on the dashboard
High road temperatures and long motorway journeys can cause tyres to heat up, increasing air pressure and putting extra strain on worn or underinflated tyres.
When this is combined with a fully loaded vehicle carrying passengers and luggage, the risk of a tyre blowout becomes even greater.
Replacing a tyre costs around £110 on average, but if more than one tyre is damaged, repair costs can quickly add up.
Warning signs to look out for:
- Low tyre pressure
- Cracks, bulges or other damage to the tyre sidewall
Your air conditioning system works hardest during the summer months, so hot weather can quickly expose any underlying faults.
If your air conditioning starts blowing warm air, produces unusual noises or struggles to cool the cabin, it could be a sign that the system needs attention.
While a simple regas can cost up to £200, leaving problems untreated may lead to more expensive repairs.
Warning signs to look out for:
Weak airflow from the vents
Warm air instead of cold
Grinding, rattling or hissing noises from the system
Carrying out a few simple checks before you travel can significantly reduce the risk of a heat-related breakdown and help you avoid costly repairs.
Before setting off, make sure you:
- Check your coolant, engine oil and screen wash levels.
- Inspect your tyre pressures and tread depth.
- Test your battery if it's more than three years old.
- Ensure your air conditioning is working effectively.
- Pack drinking water, emergency supplies and your breakdown cover details for longer journeys.
A little preparation can go a long way towards keeping your car running smoothly and ensuring a safer, more comfortable trip.
Summer is one of the busiest times of year for UK drivers, making it even more important to ensure your vehicle is ready for the journey ahead.
Regular maintenance and a few simple pre-trip checks can help prevent breakdowns, reduce repair bills and keep you moving during the warmer months.
“Simple preventative checks, such as ensuring tyres are correctly inflated, coolant levels are topped up, and the battery is in good condition, can significantly reduce the chance of breaking down during busy summer travel periods.”
Originally posted: 2nd July 2026