Summary

18 items · 30–60 minutes

Why Seasonal Prep Matters More Than You Might Think

Your car was engineered to handle a range of conditions, but that range has limits. Summer heat can push engine temperatures, tire pressure, and battery chemistry toward their breaking points. Winter cold thickens fluids, drains batteries faster, and reduces traction in ways drivers often don't feel until it's too late.

The good news is that most seasonal vulnerabilities are predictable — which means they're preventable. Working through this checklist twice a year (ideally before summer arrives and again before winter sets in) gives you a clear picture of where your vehicle stands and what, if anything, needs attention. It also tends to be cheaper than dealing with a breakdown that could have been avoided.

For a broader look at how maintenance fits into your yearly budget, see our annual car ownership cost checklist. And if you're heading into rough weather after completing these checks, driving in bad weather covers how to adjust your approach behind the wheel.

Tires

Check tire pressure with a gauge, since heat causes pressure to rise and cold causes it to drop — aim for the PSI listed on the driver's door jamb, not the tire sidewall. Must
Inspect tread depth on all four tires using the penny test (if you can see the top of Lincoln's head, the tread is too low for safe driving). Must
Look for cracks, bulges, or uneven wear patterns, which can signal alignment or suspension issues. Must
If you live in a region with significant snow or ice, consider whether dedicated winter tires are appropriate for your situation. Should

Battery

Inspect battery terminals for corrosion — a white or blue powdery buildup indicates a connection issue that should be cleaned or evaluated. Must
Have the battery tested at a shop or auto parts store before winter, since cold weather significantly reduces battery output and aging batteries often fail in the first hard freeze. Must
Check that the battery is securely mounted; vibration from driving can loosen connections over time. Should

Fluids

Check engine coolant (antifreeze) level and concentration — in winter, low concentration can allow the coolant to freeze; in summer, insufficient coolant leads to overheating. Must
Verify engine oil level and note when your next oil change is due, since oil viscosity affects how well it protects the engine in temperature extremes. Must
Top off windshield washer fluid with a formula rated for your expected temperatures — plain water freezes and can crack the reservoir. Must
Check brake fluid and power steering fluid levels, topping off only with the type specified in your owner's manual. Should

Visibility and Lighting

Inspect wiper blades for streaking, skipping, or cracking — replace them if they leave the windshield smeared after one pass. Must
Test all exterior lights including headlights, taillights, brake lights, and turn signals, replacing any burned-out bulbs before weather reduces visibility. Must
Consider switching to winter wiper blades if you regularly deal with heavy snow or ice accumulation. Nice to have

Belts, Hoses, and Under-Hood Components

With the engine cold, visually inspect rubber hoses for soft spots, cracks, or swelling — heat accelerates rubber degradation. Should
Check the serpentine belt (the wide ribbed belt that runs multiple engine accessories) for fraying or cracking; a snapped belt can disable power steering and charging. Should
If you're not comfortable inspecting belts and hoses yourself, ask a mechanic to do it during your next oil change. Must

Emergency Kit and Seasonal Supplies

Keep a basic emergency kit in the vehicle year-round: jumper cables or a jump starter, a flashlight, a basic first-aid kit, and a reflective triangle or road flares. Must
Add a winter-specific kit before cold weather: an ice scraper, small snow brush, blanket, and a bag of sand or kitty litter for traction if you get stuck. Should
In summer, include extra water and sunscreen if you're traveling in hot, remote areas where a breakdown could be more serious. Nice to have

What You'll Need to Work Through This Checklist

Most of these checks are visual and can be done in your driveway with minimal tools. A few require you to pop the hood; others are best handed off to a shop. Use the tool list below to get set up before you start.

Required

Tire pressure gauge

Accurately measures tire PSI so you can inflate or deflate to the correct level.

Required

Flashlight or work light

Helps you see into wheel wells, under the hood, and around hard-to-spot areas during inspection.

Required

Owner's manual

Contains fluid specifications, tire pressure targets, and service interval information specific to your vehicle.

Optional

Battery tester

Checks the health and output of your battery — often available free at auto parts stores.

Optional

Coolant test strips

Quickly measure antifreeze concentration to confirm your coolant is rated for winter temperatures in your area.

If a mechanic visit is in order, our guide on getting the most out of every mechanic visit can help you communicate clearly and understand what you're being quoted.

Don't Work on a Hot Engine

Always let the engine cool completely before opening the radiator cap or inspecting hoses. Hot coolant is under pressure and can cause serious burns if released suddenly. When in doubt, wait at least an hour after driving before popping the hood for fluid checks.

Once you've completed this checklist, pair it with the pre-trip safety check for a complete picture of your vehicle's readiness — season to season and drive to drive. Seasonal maintenance is also one of the more effective ways to keep car costs manageable over the life of your vehicle.

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Car Ownership Editorial Team · Contributor

Car Ownership Editorial Team is the collective byline for our editorial team and contributor network. Articles published under this byline or an editorial pen name are researched, written, and reviewed according to our editorial standards for clarity, consistency, and independence before publication.

The content on this site is for informational purposes only and is not a substitute for professional advice. Always consult a qualified professional for guidance specific to your situation.