As Pasadena transitions from cool spring mornings into warmer afternoons, drivers are discovering that the air conditioning they ignored all winter is suddenly failing them. With May highs typically reaching the low-to-mid 70s and pushing into the low 80s, a weak A/C system can turn an ordinary freeway commute into a sweltering ordeal. Local automotive expert Mike Kefalas, owner of JK Volvo in Pasadena, says the warning signs are showing up right on schedule.
Kefalas has watched the same pattern play out for decades. “People wait until the first warm spell to turn on their A/C,” he says, “and by then they’re competing with everyone else for an appointment.” He urges Pasadena-area drivers to treat early May as a test window — not a crisis point.
Air conditioning problems top the list
Air-conditioning failures rank as the most pressing concern heading into late spring. After a mild winter of little or no use, latent refrigerant leaks, worn compressors, and failing condenser fans tend to surface the moment drivers first need cool air. A failed or weak A/C system doesn’t just mean a miserable commute — it can put children and pets at risk in a hot cabin.
Technically, the problem often compounds quietly. Over years of use, A/C systems slowly lose refrigerant through tiny leaks at seals or hose connections, which reduces cooling performance and forces the compressor to work harder. Pasadena’s hot, dry summers also stress cooling fans, condenser fins, and electrical relays, any of which can quietly degrade during the cooler months when the system is used less. When May warmth finally arrives, the combination of lost refrigerant, dirty condenser surfaces, and tired components often shows up as air that never quite gets cold — especially at idle or in stop-and-go traffic on the 210 or 134.
Kefalas’s first recommendation is straightforward: test early and don’t ignore “almost cool” air. He suggests running the A/C on a warm afternoon with the fan on medium and the system set to recirculate, then watching how quickly the cabin cools. If your system is blowing only slightly cool air, cycling on and off, fogging the windshield, or making strange noises under the hood, those are early warning signs that a professional inspection is due.
A proper A/C inspection goes beyond a quick refrigerant top-off. Technicians verify blower operation and vent temperature, inspect belts and visible lines, test for leaks, and confirm that cooling fans switch on when commanded. Kefalas stresses repairing the source of any leak — replacing a worn hose, a leaking condenser, or failed seals — rather than repeatedly adding refrigerant, which is both wasteful and harmful to the environment. Catching a small leak now can prevent more expensive compressor damage later in the summer, when the system is under maximum load.
Four more threats hiding under the hood
A/C failure isn’t the only danger May brings. As daytime temperatures climb, marginal radiators, water pumps, thermostats, and hoses that performed adequately in winter begin to cause overheating — particularly in traffic. Cooling-system failures are a classic warm-season breakdown in the greater Los Angeles area.
Tires present a related risk. Hot pavement and long freeway runs increase tire temperature and pressure, worsening existing wear and raising the risk of blowouts, especially on under-inflated or aging tires. Meanwhile, heat accelerates battery wear more than cold does. A battery that survived the winter but is already marginal often begins showing slow cranking or intermittent no-start situations as temperatures rise above about 90°F.
Brakes round out the list. After months of stop-and-go driving, hills, and occasional wet roads, spring inspections frequently uncover thin pads, glazed rotors, or rust and sticking in brake components — all of which reduce stopping power heading into the summer driving season.
One visit, multiple checks
Kefalas encourages Pasadena drivers to think of an A/C service call as the starting point for a broader warm-weather safety review. “If you’re already coming in because the A/C isn’t cold,” he advises, “it’s smart to have your coolant level, hoses, tire pressures, and battery tested at the same time, especially if you have road trips planned.”
Pasadena’s long-term climate data reinforces the urgency. May is firmly inside the dry season, with average highs around 77°F and overnight lows in the low 50s. Measurable rain is rare — roughly 0.3 inches for the entire month. That dry, warming pattern only intensifies through June and July, giving drivers a narrow window to address problems before the real heat hits.
The takeaway from Kefalas is simple: early May is the time to listen to what your car is telling you — not the time to hope it will hold together through another summer. Scheduling a checkup now can prevent unpleasant surprises when temperatures spike and keep your family safer on the road.
Those are words of wisdom from local car expert Mike Kefalas. If you’ve got more questions or want him to take care of your car, you can see him at JK Volvo, 1587 E Walnut St, Pasadena. Talk to Mike at (626) 792-2240.
