How to Cool a Scorching Car Without Cranking the Air Conditioning

Overview

• Experts warn that cars parked in sun can exceed 50°C inside, which forces air conditioners to work against a large heat load and makes immediate full‑power cooling inefficient.
• ADAC recommends opening doors or windows for a few seconds to purge trapped hot air before closing them and then turning on the AC so the system has less heat to remove.
• Cambridge physicist Hannah Fry has shown a pressure‑based 'door trick' — open a window on one side and rapidly open and close the opposite door — that creates a brief suction to expel hot cabin air but it needs forceful repetition and works best when outside air is meaningfully cooler.
• Drivers should avoid setting cabin temperature more than about 6°C below outside temperature to limit circulatory stress and the risk of cold‑like symptoms.
• To cut energy use and prevent odors, consider opening windows for very short trips instead of using AC and switch off the compressor a few minutes before parking while leaving the blower running to dry the air‑conditioning system.