Posted on 9/29/2026

By the first cool morning, the weak air conditioning you noticed in August can slip off the repair list. The windows are down, the heater is getting some use, and there's little reason to spend money on cold air right now. Then a wet coat and damp shoes fog the windshield on an ordinary fall drive. Or the next warm afternoon arrives, and the vents deliver nothing but lukewarm air. A seasonal change can make the original complaint less noticeable without changing what's happening inside the refrigerant circuit. Air Conditioning Also Helps Clear Fogged Glass The A/C evaporator removes moisture from cabin air as it cools it. Many climate-control systems use that drying effect during windshield defogging, then add heat so the air reaching the glass isn't cold. Losing refrigerant can reduce that dehumidifying ability as well as summer cooling. Compressor operation isn't identical in every temperature or vehicle. Some systems inhibit it when conditions ar ... read more