Heat is more than discomfort

A hot cabin can impair concentration and make seats, restraints and controls painful to touch. Medicines, aerosols, batteries and other heat-sensitive items should be stored according to their own instructions, not left in the vehicle by default.

Ventilate before setting off

When it is safe to do so, open doors briefly to release trapped air before driving. Use the climate system as the vehicle manufacturer recommends and direct airflow so visibility and driver comfort remain good.

There is no universal six-degree limit or requirement to switch air conditioning off at a specific time. Comfort, health needs, humidity and the vehicle system vary.

Reduce solar load

Shade and a well-fitted windscreen cover can limit heating, although the sun moves. Window films must meet current Swiss approval and visibility rules; professional installation and documentation matter.

Never leave vulnerable occupants in heat

Children and animals must not remain in a hot parked vehicle. Open windows and shade do not make that safe. Swiss federal veterinary guidance explicitly warns that vehicle temperature can exceed a dog's tolerance very quickly.

Check coolant or tyre concerns according to the handbook and seek technical help for leaks or overheating.