Overview
- Many modern cars include a 'global opening' or 'convenience opening' feature that lowers every window when the unlock button is held on the key fob.
- Pressing and holding the unlock button lets hot air escape immediately and helps the vehicle cool faster than turning on air conditioning alone.
- The feature is not fitted to every make or model and some manufacturers require owners to enable it in the car’s settings, so drivers should check their owner's manual.
- The RAC and The AA advise ventilating a hot car by opening windows and doors before driving because releasing trapped air makes the cooling system work more effectively.
- The NHS and the RSPCA warn that vehicles can reach dangerous temperatures within minutes and that people, older adults or pets must never be left unattended inside even briefly; the Met Office issued a red heat warning on Saturday with temperatures reaching about 38C in parts of the UK.