As autumn turns to winter, drivers face a predictable rise in no-start calls, flat tires and breakdowns. Industry groups that track vehicle service, including the nonprofit Car Care Council and the motor club AAA, publish seasonal checklists each year aimed at the systems most affected by falling temperatures: the battery, tires, fluids and visibility equipment.
Why the battery is the first thing to fail
According to AAA's Automotive Research Center, a car battery loses about 35 percent of its starting strength at 32°F (0°C) and about 60 percent of its power at 0°F (-18°C). At the same time, a cold engine needs more current to start, so the battery is weaker exactly when it has to work hardest. AAA says the average automotive battery lasts three to five years, and newer vehicles with more onboard electronics can wear batteries out closer to the three-year mark.
The Car Care Council's fall checklist recommends having the battery and the charging system (alternator and starter) tested before winter rather than waiting for a failure. AAA offers free battery testing to members and lists warning signs such as dim or flickering lights, a weak-sounding horn, malfunctioning accessories, or a swollen, cracked or corroded battery case as reasons to have the battery checked without delay.
Tires, tread and pressure
Both organizations list tires among the top pre-winter checks. The Car Care Council's checklist calls for inspecting tread depth and pressure on all four tires and the spare, and for checking pressure weekly through the winter, since cold air causes tire pressure to drop. AAA's winter driving guidance says tires should be properly inflated and have sufficient tread for safe traction.
In regions with heavy snow and ice, the Car Care Council's checklist notes that drivers may consider switching to dedicated winter tires for extra traction and control.
Fluids, filters and the fuel tank
The Car Care Council recommends changing engine oil and filters on the manufacturer's schedule and considering a winter-weight oil in cold climates, since oil viscosity changes with temperature. It also calls for flushing the cooling system and replacing antifreeze/coolant roughly every two years to protect against freezing, and for inspecting the fuel, air and transmission filters.
Both AAA and the Car Care Council recommend keeping the fuel tank at least half full through winter: AAA's driving tips say to keep at least half a tank at all times, while the council's checklist links a fuller tank to reducing moisture buildup in the fuel system.
Visibility, lights and the exhaust system
The Car Care Council's checklist calls for confirming that heaters and defrosters work, replacing wiper blades roughly every six months, switching to a washer fluid rated for freezing temperatures, and checking that every exterior and interior light functions. It also recommends having the exhaust system inspected for leaks that could let carbon monoxide into the cabin, and calls brakes "the vehicle's most important safety item," recommending an inspection before winter.
What to keep in the car
AAA notes that winter storms and poor road conditions factor into roughly half a million crashes and more than 2,000 road deaths in the United States every winter, and recommends every vehicle carry a winter emergency kit.
- Ice scraper, snow brush and a small shovel
- Jumper cables and a charged phone or portable charger
- Flashlight with spare batteries and warning triangles or flares
- First-aid kit, blankets or warm clothing
- Food and water
- Traction aids such as sand, salt or cat litter, plus a small mat or board for tire grip
A season-by-season checklist
- Fall: test battery and charging system; check tread depth, pressure and spare tire; change oil/filters and consider winter-weight oil; flush coolant if due; replace wiper blades and switch to freeze-rated washer fluid; verify all lights and heater/defroster function; have brakes and exhaust checked; assemble an emergency kit.
- Winter: check tire pressure weekly as temperatures drop; keep the fuel tank at least half full; keep the emergency kit in the car; watch for battery warning signs such as dim or flickering lights and electrical malfunctions.
- Spring: inspect tires for winter-related damage or uneven wear and wash road salt from the undercarriage; check wiper blades for cracking caused by ice.
- Summer: recheck coolant level and condition, since cooling systems come under extra strain in hot weather.
Questions
- How much does cold weather actually affect a car battery?
- AAA's Automotive Research Center found a battery loses about 35 percent of its strength at 32°F and about 60 percent at 0°F, even as the engine needs more current to start in the cold.
- How often should I check tire pressure in winter?
- The Car Care Council recommends checking tire pressure weekly through the winter, since cold air causes pressure to drop, in addition to checking tread depth on all four tires and the spare.
- How often should wiper blades and coolant be replaced?
- The Car Care Council's checklist recommends replacing wiper blades roughly every six months and flushing the cooling system/replacing antifreeze about every two years.
- Why do motor clubs recommend keeping the fuel tank at least half full in winter?
- AAA's winter driving tips advise keeping at least half a tank at all times, and the Car Care Council links a fuller tank to reducing moisture buildup inside the fuel system.
- What should go in a winter car emergency kit?
- AAA recommends an ice scraper, snow brush, shovel, jumper cables, flashlight, warning triangles, first-aid kit, blankets, food, water and traction aids such as sand or cat litter.
This piece was prepared with artificial intelligence and passed an automated source check before publication. If you see an error, ask for a correction. Request a correction or reply · How we make this
