Pressing and holding the unlock button on many car keys automatically lowers all windows simultaneously, allowing hot air to escape before the door is opened. This feature, known as 'global opening' or 'convenience opening', can cool a vehicle's interior within seconds.
How the Trick Works
The function is available on numerous modern vehicles, though not all makes or models include it. Motorists should consult their owner's manual, as some manufacturers require activation through the car's settings. According to the RAC, opening windows and doors before driving is one of the most effective ways to release trapped heat and boost airflow.
Benefits During Heatwaves
This trick proves especially handy during hot weather, when temperatures inside a parked car can climb far more rapidly than the air outside. The Met Office has issued a red weather warning for heat impacting parts of the UK, with temperatures soaring as high as 38°C. Drivers have been seeking ways to prepare for journeys, and the solution is not overly complicated.
The AA advises ventilating a hot car before driving off rather than depending entirely on air conditioning. Allowing stifling air to escape first makes the cooling system work more efficiently and enhances comfort at the wheel.
Safety Precautions
While the little-known window feature can make a car's interior more bearable, it should never replace proper heat safety precautions. The NHS advises avoiding prolonged periods in hot, enclosed spaces and emphasises keeping cool and drinking plenty of fluids during extreme heat. Experts urge drivers never to leave children, elderly people, or pets inside a parked car, even briefly. According to the RSPCA, temperatures inside a vehicle can reach fatal levels within minutes, even if a window is left slightly ajar.
