Summer Car Care Checklist: AC, Coolant & Tyre Pressure Explained

Summer driving puts extra strain on your car that most drivers don't think about until something goes wrong. Rising temperatures affect your engine, your air conditioning and even your tyres — and ten minutes of checks now can save you a breakdown or an expensive repair later. Here's what to look at before the heat really sets in.

1. Air Conditioning

Your AC doesn't just keep you comfortable — a struggling system works harder, strains the engine and burns more fuel. Three signs yours needs attention:

• Weak or warm airflow — usually low refrigerant. This needs a proper AC re-gas, not a top-up canister from the shelf — refrigerant is a controlled substance and handling it requires certified equipment.
• Musty smell when the AC is on — bacteria building up inside the system. An anti-bacterial clean and a fresh cabin filter usually sorts it.
• Unusual noise when the AC kicks in — could be a failing compressor. Get it checked before it fails completely on a motorway run.

Tip: run your AC for ten minutes once a week, even in winter — it keeps the system lubricated and stops the seals drying out.

2. Coolant Level

Coolant (antifreeze) isn't just for winter — it's what stops your engine overheating in summer, especially in stop-start West London traffic.

• Check the coolant reservoir when the engine is cold — the level should sit between the min and max markers.
• Low coolant leads to overheating, and serious overheating can mean head gasket damage — a repair that costs many times more than a coolant top-up.
• Topping up often? That usually means a leak. Get it inspected rather than refilling again and again — leaks only get worse.

3. Tyre Pressure

Hot roads make the air inside your tyres expand, so summer pressures drift from where they were in cooler months.

• Check pressures when the tyres are cold (before driving), against the PSI sticker inside the driver's door or in the handbook.
• Under-inflated tyres wear unevenly, use more fuel and raise the risk of a blowout on longer journeys.
• Over-inflated tyres reduce grip and make the ride harsh.
• Check the spare too — especially before a road trip. Worn or damaged? Our tyre team can supply and fit while you wait.

4. The Quick Extras

While you're at it, give these thirty seconds each:

• Washer fluid — you'll use far more of it with summer dust and bugs on the screen.
• Battery — most people think winter kills batteries, but heat is actually harder on them and speeds up corrosion. A free battery health check tells you if yours will last the season.
• Wiper blades — sun dries out the rubber and cracks it, then the first summer downpour catches you out.

Heading Off on a Summer Road Trip?

If you've got a long drive coming up — airport runs, the coast, or driving to Europe — it's worth having the car looked over properly before you go. A service covers all of the above and much more, and catches the problems you can't spot from the driveway.

Get Summer-Ready at Marieston Service Centre

From AC re-gas to cooling system repairs and tyres, we'll have your car ready for the heat. Based in Hayes UB4, serving Southall, Uxbridge, Hounslow, Ealing and the surrounding West London areas.

Book online in minutes or request a free quote.

Frequently Asked Questions

How often does car AC need re-gassing?
Roughly every 2–3 years. AC systems naturally lose a small amount of refrigerant each year, so if yours has never been re-gassed, it's almost certainly below its best.

Can I just top up coolant with water?
In an emergency, yes — but only as a get-you-home measure. Water alone doesn't protect against corrosion or boiling, so have the mix corrected properly afterwards.

What should my tyre pressure be in summer?
The same as the manufacturer recommends year-round — the figure on your door sticker. Just check it more often in summer, and always when the tyres are cold.

Why does my car overheat in traffic but not on the motorway?
At speed, airflow cools the radiator naturally; in traffic there's none, so the electric fan has to do the work. If the temperature climbs in queues, the fan, thermostat or coolant level needs checking — don't ignore it.