Summer car care: what a Massachusetts summer asks of your car

Cooling system: the number-one summer failure

Overheating is the classic summer breakdown, and it is almost always preventable. Coolant does not just prevent freezing; it manages heat and resists corrosion, and it degrades over time. If your coolant has not been flushed on schedule (five years or 100,000 miles for most long-life coolants), summer is when a tired system shows it.

Watch the temperature gauge in stop-and-go traffic and on hot days. If it climbs above normal, or you see coolant pooling under the car or smell a sweet, syrupy odor, get it looked at before you drive further — an overheated engine can warp or crack in minutes.

• Check coolant level and condition; flush on schedule
• Look for leaks at the hoses, radiator and water pump
• Have the radiator cap and thermostat checked if the car runs hot
• Never open a hot radiator cap — wait for it to cool completely

Air conditioning: fix it before the heat wave

An A/C system that blows warm has almost always lost refrigerant, and refrigerant only leaves through a leak. A shop can run an A/C performance check, find the leak with dye or an electronic detector, and recharge the system. Simply topping it up without finding the leak vents refrigerant into the atmosphere and leaves you warm again in weeks.

Book this in May, not July. The first heat wave fills every shop in Franklin and the surrounding towns with A/C work, and you will wait days for an appointment.

Tires: heat, pressure and blowouts

Tire pressure rises with temperature — roughly 1 PSI for every 10 degrees — and hot pavement plus an underinflated, worn or old tire is the classic recipe for a summer blowout. Set pressures to the door-jamb spec in the morning when tires are cold, and check the sidewalls for cracking, especially on tires more than six years old.

Long summer road trips are exactly when a marginal tire fails. If your tread or tire age is borderline, deal with it before the trip, not on the shoulder of I-495 in July.

Battery: summer is when the damage is done

It feels backwards, but summer heat is what wears batteries out — the cold winter morning just reveals it. Heat evaporates the fluid inside and accelerates internal corrosion. If your battery is over three years old, have it load-tested at your summer service so a weak one gets caught before fall.

Wipers, fluid and the little things

Winter shreds wiper blades, so summer is a good time to replace them and refill washer fluid for pollen, bug splatter and dust. Check that your cabin air filter is not clogged from spring pollen — a fresh one noticeably improves A/C airflow. And keep an eye on sun-baked rubber and a glovebox emergency kit adapted for heat rather than cold.

Frequently asked questions

Why does my car overheat in summer traffic?

Usually low or degraded coolant, a failing thermostat, a weak water pump, or a radiator fan that is not engaging. Stop-and-go traffic removes the airflow that normally helps cool the engine, so a marginal cooling system shows itself then. Have it checked before it warps the engine.

When should I get my car's A/C serviced?

In late spring, before the first heat wave. If it blows warm, the system has a leak that needs finding and repair, not just a top-up. Booking early also avoids the multi-day waits that hit every shop once summer arrives.

Does summer heat really hurt my car battery?

Yes — more than cold does. Heat evaporates fluid and corrodes the battery internally, wearing it out over the summer, and the first cold morning then exposes it as a no-start. Test any battery over three years old at your summer service.