Don't Turn Off Your Car's AC This Winter — Experts Explain Why

Running your car's air conditioning in winter isn't a luxury — it's a technical necessity that automotive experts warn against ignoring. Germany's TÜV NORD inspection authority recommends switching on the AC at least once a week for no less than 10 minutes, even in cold weather, to protect the refrigerant loop and prevent seal drying. A small habit with a big payoff.

Why do many drivers think winter AC shutdown is correct?

Some drivers believe that keeping the AC off during winter preserves its efficiency and extends its lifespan. That's technically wrong. The air conditioning system doesn't just cool the cabin — it also removes moisture from the air when running, making it an effective tool against windshield fogging in cold, rainy conditions. Toyota and other brands confirm this in their official maintenance guides.

How AC removes humidity and improves visibility

When you run the AC in winter, the system pulls moisture from inside the cabin and prevents fog from forming on the windshield — a vital function that heating alone can't provide. Experts recommend running the AC with airflow directed at the windshield, using outside air instead of recirculating cabin air. Setting heating to an appropriate temperature. This three-part approach delivers clear visibility and safer driving on winter roads.

What happens to the AC system when neglected?

Regular operation keeps compressor oil and seals circulating within the refrigerant loop. TÜV NORD notes that an AC system can lose roughly 8 to 10 percent of its refrigerant annually through natural permeation. That makes routine inspection essential when cooling performance drops. Moisture and dirt buildup inside the ventilation system also causes unwanted odors, requiring system cleaning and cabin filter replacement according to manufacturer recommendations.

The cabin filter — winter maintenance's forgotten part

The cabin air filter is one of those components that needs regular attention, especially in autumn and winter. Dust and moisture accumulate in it, affecting air quality and ventilation efficiency. TÜV NORD recommends replacing the cabin filter annually or roughly every 15,000 kilometers, along with checking air intake vents for blockages from leaves or debris. Neglecting this filter doesn't just hurt air quality — it strains the entire system.

How to maintain your car's AC in winter

Run the AC weekly for at least 10 minutes, even in cold weather. Set it to defrost mode when fog builds on the glass. Use outside air rather than recirculation. Check refrigerant levels annually at a qualified workshop. Replace the cabin filter every 15,000 kilometers or once a year. These five simple steps protect the compressor on a Hyundai or any other vehicle from costly breakdowns. Preventive maintenance costs far less than replacing a compressor or repairing refrigerant leaks.

A car's AC is a complete system — it doesn't only work in summer. Running it during winter protects internal components, prevents windshield fogging, and maintains cabin air quality. TÜV NORD's advice is clear: 10 minutes a week is enough. Don't wait until odors appear or cooling weakens next summer — start now.