Symptoms
- Cold weather approaching and unsure what to check
- Car struggled to start last winter
- Want to avoid a breakdown in cold weather
Likely causes
- CommonWeak battery not tested before winterCold weather increases the power needed to start the engine while reducing the battery's actual output.
- CommonTire pressure and tread not checked for winter conditionsCold air drops tire pressure and worn tread reduces traction on ice and snow.
- PossibleWasher fluid and antifreeze not rated for the coldSummer-grade fluids can freeze and stop working when temperatures drop.
What to do
- Have the battery load-tested, especially if it's more than 3 years old, since cold weather is when weak batteries fail.
- Check tire tread depth and consider winter or all-season tires if you regularly see snow and ice.
- Check and adjust tire pressure for colder temperatures, since PSI drops as it gets colder.
- Verify coolant is mixed to handle your area's expected low temperatures and top off with winter-rated washer fluid.
- Replace worn wiper blades and keep an ice scraper and a small emergency kit (blanket, flashlight, gloves) in the car.
- Check that the heater and defroster work properly before you actually need them on a cold morning.
Tools and parts
- Tire pressure gauge
- Ice scraper
Winter-rated washer fluidSearch: “washer fluid rated for cold winter temperatures”
When to call a pro
If the battery tests weak or tires are worn below a safe tread depth, replace them before winter rather than waiting for a cold-weather failure.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.