Preparing Your Car for a Summer Road Trip

A summer road trip is when small, ignored problems tend to turn into roadside breakdowns, mostly because higher temperatures and longer distances put more strain on systems that have been coasting through gentler winter driving. A bit of preparation beforehand goes a long way toward making sure the only thing you’re dealing with on the motorway is traffic, not a warning light.

Why summer driving is harder on a car than it seems

It’s easy to assume winter is the tougher season for a car, given the cold starts and gritted roads, but summer brings its own strain. Higher ambient temperatures mean the cooling system works harder just to keep the engine at a safe operating temperature, air conditioning runs almost constantly, and longer motorway stretches at sustained speed put more heat into tyres and brakes than typical stop-start town driving does.

Checking the cooling system properly

Coolant level and concentration should be checked before any long trip, along with a visual inspection of hoses for cracking, sponginess or leaks. An engine that overheats on a hot motorway with a full car and luggage is a considerably worse experience than the same issue showing up on a short local drive, so this is worth getting right in advance rather than hoping for the best.

Getting the air conditioning ready

Air conditioning gradually loses refrigerant over time even without an obvious leak, and a system running low won’t cool effectively, which is particularly noticeable on a hot, fully loaded car during a long drive. An AC re-gas restores proper cooling performance and is worth booking before you set off rather than discovering the problem somewhere unpleasant on the journey itself.

• Coolant level and hose condition
• Air conditioning performance and refrigerant level
• Tyre tread depth and pressure, including the spare
• Brake pad and fluid condition
• Oil level and condition, particularly before a long-distance drive
• Wiper blades and screen wash for glare and bug splatter

Tyres take on more strain in hot weather

Tyre pressures should be checked when tyres are cold, since heat from sustained driving naturally raises pressure and can mask an underlying problem. Underinflated tyres flex more and build up heat faster, which increases the risk of a blowout on a long, hot motorway stretch. Tread depth also matters more than usual if the trip includes any chance of a summer downpour, since worn tread struggles considerably more with standing water.

Brakes and the extra weight of a loaded car

A car loaded with passengers, luggage, and sometimes a roof box or trailer needs more braking effort to slow down than the same car driven empty. If pads or discs were already toward the end of their life, a long trip with a full load is a demanding way to find that out. A quick check beforehand avoids that risk entirely.

Battery health matters more than people expect

Counterintuitively, hot weather is actually harder on batteries than cold weather in some respects, since heat accelerates the chemical degradation inside the battery. A battery that’s been marginal for a while can fail without warning on a hot day, particularly with air conditioning, infotainment and other electrical loads running throughout a long drive.

Packing a basic emergency kit

Even with everything checked, it’s sensible to carry a basic kit, water, a torch, a warning triangle, breakdown cover details, and phone chargers. Long stretches of motorway in unfamiliar areas are not where you want to discover you’re missing something simple.

Booking a pre-trip check

A mobile mechanic can run through coolant, air conditioning, tyres, brakes, battery and fluids at your home before you set off, catching anything that needs attention with enough time to actually sort it rather than finding out halfway down the motorway. It’s a modest investment of time that meaningfully reduces the chance of your trip being interrupted by something that was entirely preventable.

Planning your route with breakdown risk in mind

If your route includes long stretches without service stations, particularly through more rural parts of the country, it’s worth being extra thorough beforehand, since help can take longer to reach you and you’ll be relying more heavily on your own preparation. Checking your breakdown cover is current and understanding what it includes, whether that’s roadside assistance only or home start and onward travel too, is worth five minutes before you set off rather than discovering the gaps when you actually need it.

Why fluid levels matter more on a long, hot drive

Engine oil naturally thins slightly at higher temperatures, and a car running low on oil is more likely to suffer from inadequate lubrication exactly when sustained motorway speeds and high ambient heat are already pushing the engine harder. The same logic applies to power steering and transmission fluid where applicable. None of these take long to check, but low levels discovered on the drive itself are considerably more stressful than catching them beforehand with the car safely parked on your drive.

Keeping passengers comfortable on a hot journey

Beyond the mechanical side, a few small habits make a real difference to comfort on a long summer drive, sun shades for rear passengers, particularly children, plenty of water on board, and planning regular stops roughly every two hours to stretch and rest. A car that’s mechanically sound but has passengers overheating or dehydrated in the back seat is still a miserable trip, so it’s worth thinking about comfort alongside the purely mechanical preparation.

What to do if something does go wrong on the road

Even with thorough preparation, things can still go wrong. Pulling over safely, ideally onto a hard shoulder or lay-by away from moving traffic, putting on hazard lights, and getting passengers out of the car and behind a barrier where possible on a motorway, are the priorities before anything else. Having your breakdown provider’s number saved and easily accessible, rather than needing to search for it under stress, is a small thing that makes a real difference in the moment.

Checking your car’s documents before you go

Beyond the mechanical side, it’s worth confirming your MOT and insurance won’t expire mid-trip, particularly for longer holidays. Breaking down or being stopped with an expired MOT adds an entirely avoidable complication to what should be a straightforward trip. If you’re driving abroad as part of the journey, checking what additional documentation or equipment, such as a warning triangle or high-vis vest, is legally required in the countries you’ll be passing through is worth doing well in advance.

Roof boxes, trailers and towing considerations

Adding a roof box changes a car’s aerodynamics and centre of gravity, which affects handling, fuel consumption and, at motorway speeds, stability in crosswinds. If you’re towing a trailer or caravan, checking the tow hitch, electrics and trailer tyres becomes just as important as checking the car itself, since a trailer fault can just as easily interrupt a trip as a fault with the car pulling it. These extras are worth factoring into your pre-trip check rather than treating the car in isolation.

A simple pre-departure walk-round

On the morning you actually leave, a five-minute walk around the car, checking tyre pressures visually, confirming lights work, glancing at fluid levels through the dipstick and coolant reservoir, catches anything that might have changed since your pre-trip check without needing to redo the whole inspection. It’s a small habit that costs almost nothing in time but adds a genuine extra layer of confidence before a long drive.

Considering an EV or hybrid for a summer trip

If your car is electric or hybrid, summer preparation looks slightly different, planning charging stops along your route becomes as important as checking fluids, since range can vary with air conditioning use and motorway speeds. Checking your charging app for working chargers along less familiar routes, and building in a buffer rather than cutting range too fine, avoids one of the more stressful ways a summer trip can go wrong for electric vehicle owners specifically.

Making preparation part of your routine, not a one-off

Rather than treating pre-trip checks as a single annual scramble before the school holidays, building basic checks into a regular routine throughout the year, tyres, fluids, lights, means summer preparation becomes a much lighter task since most things are already in good order. It’s a small shift in habit that pays off every time you’re planning a longer drive, not just the big summer trip.

Why a checklist beats relying on memory

Even experienced drivers forget a step or two when preparing for a trip under the usual pre-holiday time pressure, packing, planning, work deadlines before leaving. Writing down a simple checklist, coolant, oil, tyres, brakes, air conditioning, lights, and physically ticking each item off removes the reliance on memory and gives genuine peace of mind that nothing important was skipped in the rush to get on the road.

The value of getting it done well before you leave

Booking your pre-trip check with enough lead time means that if something unexpected does turn up, a part needing to be ordered, a repair needing more time than a quick visit allows, there’s no pressure to either delay the trip or set off with an unresolved issue. That breathing room is worth building into your planning every time, rather than treating the check as a last-minute box to tick the day before you leave.

Special considerations for older cars on long trips

An older car that’s mechanically sound for daily local driving can still be pushed harder than usual by a long, hot motorway trip with a full load, exactly the conditions most likely to expose a marginal component. If your car is more than eight or ten years old, it’s worth being a little more thorough than usual with the pre-trip check, paying particular attention to cooling system condition, belts and hoses, and the general state of the battery and charging system.

Why a rushed last-minute check rarely catches everything

Squeezing a car check into the same day as final packing, alongside everything else involved in leaving for a trip, means things get missed. A hose that needed a slightly closer look, a tyre that needed more than a glance, get waved through simply because there isn’t time to deal with anything more than a superficial check. Separating the mechanical preparation from the packing and logistics, even by just a few days, gives both tasks the proper attention they deserve.

Why this preparation pays off well beyond the summer

Everything covered in a proper pre-trip check, coolant, brakes, tyres, battery, fluids, also directly supports year-round reliability rather than being a purely summer-specific exercise. Treating the summer road trip as a natural prompt to get these things looked at properly means you’re heading into autumn and winter with a car that’s already in good order, rather than starting the next season from a worse position than you began this one.

One last thought before you set off

No amount of preparation removes every possible risk from a long drive, but it dramatically reduces the odds of a preventable, entirely avoidable breakdown ruining what should be an enjoyable trip. Taking the time to get everything checked properly beforehand means you can actually relax and enjoy the journey once you’re finally on the road.

A few checks now, done properly and without rushing, is a small price for the peace of mind that comes with knowing your car is genuinely ready for whatever distance you’re about to cover this summer.

Print or save your checklist somewhere you will actually see it again, on your phone notes or stuck to the fridge, rather than relying on remembering it fresh each time a trip comes around. Small consistent habits like this are what genuinely keep a car reliable, trip after trip, year after year, far more than any single last minute scramble ever could.

Whatever the destination, the same fundamentals apply, a car that starts the trip in good mechanical condition is simply less likely to interrupt it. That’s the whole point of getting everything looked at properly beforehand, not to eliminate every possible risk, but to remove the preventable ones so the only surprises left on the journey are the good kind.

Source: the RAC's road trip checklist