The AA and RAC both report a summer rise in call-outs for flat batteries, overheating and tyre failures, mostly on cars that hadn't been checked before a long motorway run. Before any UK summer road trip, check tyre pressure and tread (including the spare or repair kit), top up coolant and screenwash, and test the air conditioning and battery — a battery that's been fine for short local trips can still fail under sustained motorway load and summer heat.
At a glance
| Check | Why it matters in summer |
|---|---|
| Tyre pressure and tread | Under-inflated tyres build heat faster and are more likely to blow at motorway speed |
| Coolant level | Low coolant is the top cause of summer overheating, especially in traffic |
| Battery health | Heat accelerates battery wear; batteries over 4-5 years old are highest risk |
| Air conditioning | A failing A/C system can also indicate a refrigerant leak worth fixing before a long trip |
| Screenwash and wipers | Insect splatter and road dust build up fast on long summer drives |
Why summer breakdowns spike
Counter-intuitively, summer is one of the busiest seasons for UK breakdown services. Hot weather increases the load on cooling systems, accelerates battery degradation (heat is harder on batteries than cold, despite winter getting more attention), and motorway driving at sustained speed and load exposes tyre defects that pottering around town never reveals.
The pre-trip checklist
- Check tyre pressures cold (before driving) against the figures on the door-sill sticker, not the tyre sidewall — a fully loaded car for a family trip often needs higher pressure than everyday use.
- Check tread depth is comfortably above the 1.6mm legal minimum on all four tyres and the spare, and look for uneven wear that suggests an alignment issue.
- Check coolant level against the min/max marks on the expansion tank when the engine is cold.
- Top up screenwash — a full tank, not just "some in there", given how quickly a windscreen fouls on a long motorway run.
- Test the air conditioning for a few minutes before you leave, ideally a day or two ahead so there's time to get any fault looked at.
- Check the battery, especially if it's more than 4-5 years old or has struggled to start recently — many garages will test it for free or at low cost.
- Check oil level and that you're not overdue a service, particularly before a long-distance or towing trip.
Loading the car properly
Overloading is a common, overlooked summer risk. Roof boxes and heavy boots change a car's handling and braking distance, and exceeding the manufacturer's maximum gross vehicle weight is both unsafe and can invalidate insurance in the event of a claim. Distribute weight low and evenly, and secure loose items that could become projectiles under heavy braking.
If the temperature gauge climbs in stationary or slow traffic, turn on the heater (it draws heat away from the engine) and pull over safely as soon as you can rather than continuing on the assumption it will settle. Continuing to drive an overheating engine is one of the fastest ways to turn a warning light into a full breakdown.
Planning for the drive itself
- Check for roadworks and traffic hotspots before setting off, particularly on peak getaway weekends in July and August.
- Carry water for passengers and, if travelling with pets, plan stops — a car's interior can reach dangerous temperatures within minutes even with windows cracked.
- Keep breakdown cover details and your policy number accessible, not just saved in an app that needs signal to open.
- Pack a basic emergency kit — hi-vis vest, torch, phone charger — since UK motorway hard shoulders carry real risk from passing traffic.
Frequently asked questions
What tyre pressure should I use for a fully loaded summer trip?
Why do car batteries fail more in summer than expected?
Is it dangerous to overheat in traffic?
Do I need to check my spare tyre or repair kit before a road trip?
Sources & further reading
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
