Fall car prep: the changes to make before the first freeze
Heater core check, antifreeze testing, wiper upgrades, and lighting inspection to prepare for shorter days and colder nights.
Fall is your last chance to address issues before winter makes them dangerous or expensive. The goal is to test systems that winter will stress — heating, defrost, visibility, and cold-start reliability.
Test your heater before you need it. Run the car until the temperature gauge reaches the middle, then turn the heat to maximum. You should feel hot air within 30 seconds. If the air is lukewarm, the most common culprits are a stuck thermostat ($100-200 repair), a clogged heater core ($500-1,000), or low coolant. A functioning heater isn't just about comfort — the defrost system depends on it, and a fogged windshield is a serious visibility hazard.
Check all exterior lighting. Days get shorter in fall, and you'll be driving in darkness more often. Walk around the car with someone pressing each control: headlights (low and high beam), tail lights, brake lights, turn signals, reverse lights, and fog lights if equipped. Bulbs cost $5-15 and most can be replaced without tools.
Upgrade to winter wiper blades if you live in a snow region. Winter blades have a rubber boot that prevents ice from clogging the pivot points. They cost $5-10 more than standard blades and make a meaningful difference in freezing rain and sleet.
Top off the windshield washer reservoir with winter-rated fluid (-20F or lower). Running out of washer fluid behind a salt truck on the highway is a genuinely dangerous situation — salt spray on the windshield with no way to clear it reduces visibility to nearly zero within seconds.
Information is for educational purposes only. Always consult a qualified mechanic for diagnosis and repair. AutoAt's knowledge base is AI-assisted and regularly updated but may not reflect the most current manufacturer specifications. Always verify critical specifications with official service manuals. Repair procedures described here may require professional tools, training, and certifications. Attempting repairs beyond your skill level can be dangerous.