How to Deal with Foggy Windshield When Using Air Conditioning in Summer?
4 Answers
Solutions for foggy windshield when using air conditioning in summer: 1. Avoid directing cold air towards the front windshield; 2. Dishwashing liquid or soap can be used for car window anti-fogging, as these detergents disrupt the attraction between water molecules, reducing surface tension; 3. There are specialized anti-fogging agents for car windows on the market that absorb moisture on the mirror surface, forming a water film to prevent fogging; 4. Slightly opening the windows can help balance the temperature; 5. If rainy days are frequent and opening windows is not suitable, you can turn on the external circulation for defogging. The correct air vent setting is to blow air towards both the front windshield and the foot area, or only towards the front windshield.
Fogging up of the windshield when using the air conditioning during summer driving is indeed annoying. This mainly occurs because the cold air from the car's AC meets the external hot and humid air, causing the glass surface temperature to drop and water vapor to condense instantly, forming fog. To deal with this, first immediately activate the front window defogging mode of the AC—most cars have a dedicated button for this, which directs high airflow toward the windshield. Next, adjust the temperature settings; in summer, it's better to use cold air rather than hot air to quickly reduce humidity. If the fog persists, switch to the external circulation mode to introduce outside air and assist in dehumidification. Also, ensure there aren’t too many passengers or sources of moisture inside the car, such as closing windows to minimize humidity intake. For prevention, regularly clean the inside and outside of the windshield, as dirt tends to trap moisture—use a dedicated glass cleaner for wiping. Additionally, when parking, let the AC run for a few minutes to balance temperature and humidity. The key point here is not to panic when fogging occurs—safety first. If visibility is poor, slow down or pull over to handle it, as driving safety is far more important than being late.
In summer, when the car's air conditioning is on, the rear windshield often fogs up. Simply put, it's due to temperature differences. Immediately operate the air conditioning system: press the front windshield defogging button, turn the fan to maximum, and usually the fog will dissipate instantly; set the temperature lower, as cold air works faster in summer. If the effect isn't obvious, try switching the air circulation mode to external circulation to let fresh air in and dilute the humidity. Regular maintenance is important—clean the windshield frequently to avoid oil film buildup that can cause fogging. A preventive tip is to open the windows for a few minutes before driving to balance the internal and external temperatures and reduce condensation. If the fog is severe and visibility is poor, turn on the hazard lights immediately and find a safe place to pull over—never push through. Remember, keep the air filter clean, as excessive dirt can hinder dehumidification efficiency. Regular replacement ensures the system runs smoothly.
Windshield fogging is common when using air conditioning in summer, and it must be addressed promptly to avoid danger. Immediately activate the defogging function, set the air conditioning to blow directly at the windshield, increase the fan speed, and prioritize cold air for dehumidification. Check if the air conditioning is in external circulation mode, as this helps introduce dry air to reduce fogging. If fogging persists, the air conditioning system may require maintenance, such as cleaning the air ducts or replacing the filter. From a safety perspective, fogging severely impairs visibility, so it's essential to pull over and inspect the issue—never drive blindly. For prevention: regularly clean the glass, keep the interior dry, and avoid leaving damp items like wet towels inside the car.
