How to Deal with Foggy Windshield on Rainy Summer Days?
3 Answers
On rainy days, if the windshield fogs up, you can: open windows for ventilation, use heating to defog, use air conditioning to defog, or apply chemical agents. Here are some solutions for dealing with a foggy windshield on rainy days: 1. Open windows for ventilation: If the rain is light, just a drizzle, you can choose to open both the front and rear windows slightly, preferably in a diagonal pattern. This way, as the car moves, external air can circulate inside the car and exit through the rear window. 2. Heating to defog: If the rain is heavy, opening windows for ventilation isn't an option, so other methods must be used to remove the fog. Since the fog is on the windshield, using hot air to evaporate it directly is effective, though this method may worsen the fog initially for a few minutes, so it should be used when safe. 3. Air conditioning to defog: If the car is in motion, using heating to defog can be dangerous as it may obstruct vision. In this case, turning on the air conditioning to cool and defog is advisable. Since the fog is caused by temperature differences, lowering the interior temperature to match the outside temperature will prevent fog from forming.
I've experienced windshield fogging on rainy days many times while driving. First, turn on the air conditioning system by pressing the A/C button and the dedicated windshield defogger button (the icon looks like a small fan). Switch to fresh air mode to let dry air circulate and absorb moisture, setting the temperature lower as cold air works fastest. When fogging occurs rapidly, I also use a clean cloth to wipe the inner glass surface to reduce condensation. In summer when humidity is high, heavy rain often causes this - once on the highway the fog was so thick I almost crashed, but fortunately handled it in time. Developing a habit of regular window cleaning helps, as dust accumulation makes fogging more frequent. In hot weather, pre-cooling with AC is a good preventive measure. Ultimately, maintaining clear visibility is the crucial safety step.
Safe driving is my top priority, and fogging up the windshield before rain is extremely dangerous. Once fog appears, immediately turn on the hazard warning lights and pull over if conditions allow. Then quickly activate the air conditioning defogging function: set it to windshield mode, turn on the A/C for dehumidification with cold air, and remember to switch to external circulation to prevent moisture buildup inside the car. Wiping the glass interior with tissues provides temporary relief, but the real solution comes from running the AC. Summer humidity combined with rain interference can easily lead to loss of visibility, so I always remind myself to stay extra focused when driving in rainy or foggy conditions. Afterwards, check if the wipers and AC filter are functioning properly to prevent issues during the next rainfall. A simple tip: keep an anti-fog cloth in your bag for quick use anytime.
