At what engine coolant temperature can the car's heating system be turned on?

[Doreen]

You can turn on the car's heating system when the engine coolant temperature reaches between 80°C and 90°C. The normal operating temperature range for most car engines is typically between 80°C and 90°C, while some high-performance engines may operate at temperatures exceeding 100°C. Since the heating system relies on engine coolant for warmth, activating the heater too early will slow down the coolant's warming process and prolong the engine warm-up period. Additional information: Functions of the car's heating system: 1. Heating: During cold winter weather, passengers feel particularly chilly inside a moving vehicle. The car's heating system provides warmth to increase cabin temperature and improve passenger comfort. 2. Defrosting: In winter or early spring when there's significant temperature difference between inside and outside, frost or fog may form on windows, obstructing the driver's view and compromising driving safety. The heating system can be used to remove frost and fog from the windows.