What the Cold Will Do to Your Car If You Don't Prepare It Now
September arrives and your car comes from months of heat, trips, and accumulated miles. It seems like everything is working fine. And it might be true. But there are elements that summer deteriorates silently, and that winter will put to the test as soon as the first frosts arrive.
This isn’t about doing a complete inspection at the shop. It’s about checking half a dozen specific things that, if they fail in winter, will leave you stranded at the worst possible moment.
Doing it now, before the cold arrives, is always easier and cheaper than doing it later.
The Battery: The Component That Fails Most in Winter
The battery is the element that causes the most problems in the cold months. Not because the cold breaks it outright, but because the cold reduces its starting capacity and exposes a weakness that already existed.
A battery that held up well in summer may refuse to start on a January morning at freezing temperatures. And it does so without warning.
If your battery is more than three or four years old, it’s recommended to have it load-tested before winter. Most shops and parts stores do this for free or very cheap. The test will tell you if the battery is in good condition to continue or if it’s better to replace it now, at your leisure, rather than wait for the first day of intense cold.
Warning signs not to ignore: slow starts, the engine taking longer than usual to turn on, or lights losing intensity when starting.
Tires: Tread, Pressure, and Whether You Need New Ones
Summer consumes tires. Miles of highway, hot asphalt, maybe some extra luggage weight. In September it’s worth checking them before the rains and cold arrive.
Two specific things to check:
The tread. In Spain the legal limit is 1.6 mm of depth, but starting from 2-3 mm the effectiveness in rain drops considerably. If you’re in that range, you’re technically within the law but with noticeably reduced braking capacity in rain or snow conditions. Most tires have wear indicators in the grooves themselves: when the rubber is level with the indicator, they need to be changed.
The pressure. With cold, pressure drops. For every 10 degrees the temperature falls, tires lose approximately 0.1 bars. The correct pressure is in your vehicle’s manual or on a sticker on the driver’s door frame. Check it and correct it if necessary.
If you live in an area with frequent snowfall or if you’re going to spend time in the mountains, consider whether you need winter or all-season tires. In some autonomous communities there are specific obligations or recommendations in this regard; it’s worth checking according to your area before December.
Antifreeze Liquid: It’s Not Just for the Radiator
Antifreeze protects the engine from extreme temperatures, both heat and cold. Over time, its concentration degrades and its freezing point rises. That is, it can freeze at temperatures it previously tolerated without problem.
What you need to check: the concentration of the liquid and its level. Concentration is measured with a refractometer, an inexpensive tool that many shops use routinely. The usual mixture is 50% antifreeze and 50% water, although the manufacturer may recommend a different proportion depending on the climatic zone.
If the liquid hasn’t been changed in more than two years, it may no longer protect adequately for below-zero temperatures.
Wipers: Summer Ones Aren’t the Same in Cold
Windshield wiper blades deteriorate from heat. Sun and high temperatures harden the rubber and crack it. The result is not always noticeable in summer, when it rains little, but in autumn, with the first heavy rains, it reappears in the form of streaks of unwashed water, scratches on the glass, or squeaking sounds when wiping.
Changing them is cheap and quick. And driving with reduced visibility on a rainy night can compromise safety significantly.
Some drivers opt for winter-specific wipers in areas with snowfall, although it’s not essential in most of Spain.
Visibility and Brakes: Two Inspections Not to Forget
Glass and lights. Winter means later sunrises, earlier sunsets, and more hours driving with artificial light. A windshield with scratches, grease, or accumulated dirt can glare in rainy nighttime conditions in a way that goes unnoticed in summer. Clean the windows thoroughly inside and out, and check that all lights work: position, low beam, high beam, brake, and fog if you have them.
Brakes. If summer included many miles, especially in the mountains or on busy highways, the brakes may have worked harder than usual. September is a good time to check the thickness of the brake pads and the condition of the discs. You don’t need to do it every year, but after a summer of lots of miles it’s recommended to at least take a look.
Write Down What You Do, So You Don’t Start from Scratch Next Year
Every time you change something or do a winter inspection, record the date and mileage. Not to meet any requirement, but so that next year you don’t have to rack your brain again.
With OwnAutoCare you can record each inspection with its date, the mileage, and what was done. For seasonal maintenance like this, you can create a manual reminder with a date so you don’t miss the next season.
A well-kept history not only saves you doubts at the shop. If you ever sell the car, it’s the best argument you can present.
This winter doesn’t have to catch you unprepared. With a half morning and a few euros in preventive inspections, you’ll significantly reduce the chances of the cold leaving you stranded.