Car trouble in Fresno
Fresno's climate is hard on cars in one main way: heat. National Weather Service records for the city show 69 days at or above 100°F in 2021, the most on record; even the year with the fewest, 1956, still logged 15. When it comes to wear, heat matters here far more than cold.
Heat kills batteries
People often think batteries die in winter, and that's when a weak one finally fails to start the car. But heat does much of the damage, speeding up the chemical wear inside. NOAA's engineering weather data for Fresno records an average of only about 10 freeze-thaw cycles a year, so the long, hot summers are the main stress here. Have your battery tested before summer if it's a few years old, and keep the terminals clean.
Cooling systems in triple digits
An engine in Fresno traffic on a 108-degree afternoon is working at the edge of its cooling system's capacity. Coolant that's past its service interval, a weak fan, a clogged radiator or a sticking thermostat can all tip it over. If the temperature gauge starts creeping, have the cooling system checked before the next heat wave. Never open a hot radiator cap.
Air conditioning
A failing AC in a Fresno summer isn't just uncomfortable; it's a safety issue for children, older passengers and pets. If cooling fades over weeks, there's likely a leak, and a recharge without a repair won't last. If it's weak only at idle, check the condenser fans. Ask the shop to find the cause.
Tires and hot pavement
Hot pavement raises tire temperatures and pressures, and sun and heat age rubber. Check pressures when tires are cold, using the sticker inside the driver's door. Look for sidewall cracking on tires that are several years old, even if the tread looks fine.
Dust and fine particles
Fresno County is part of the San Joaquin Valley area that the EPA has designated nonattainment for federal fine-particle (PM2.5) air quality standards. The engine air filter and the cabin air filter both clog faster in dusty conditions. Ask the shop to check them at every oil change, and follow your owner's manual's interval for dusty driving if it gives one.
Hoses, belts and rubber
Heat ages rubber hoses, belts, wiper blades and seals. A belt that squeals on startup or a hose that feels soft or swollen is worth replacing before it fails on a hot day far from home.
Fluids
Engine oil, transmission fluid and coolant all work harder in heat. Many owner's manuals list a severe-service maintenance schedule for extreme heat, dusty conditions or stop-and-go driving. Ask the shop which schedule fits how and where you drive.
Choosing a shop
Ask how the shop diagnoses problems, whether they charge for diagnosis, and whether they'll call you before doing anything beyond the estimate. Ask what the warranty covers, in writing.