How long after starting the car can you turn on the heater?

[MatthewLee]

The car needs to wait until the engine's coolant temperature reaches the standard level before turning on the heater. Generally, it takes about five to ten minutes. The source of the car's heating system is the engine. Especially in winter, if the engine is cold-started, its temperature is very low. If you start the heater before the engine has warmed up, not only will cold air blow out, but it will also hinder the engine's temperature from rising. Here is more information: 1. If the engine's coolant temperature hasn't risen, excessively low temperatures can reduce the performance of the engine and other components. This not only increases the car's driving burden but also naturally raises fuel consumption. 2. Most cars today use a water-based heating system, while some high-end models may combine water heating with a PTC heater. Additionally, the heater's temperature isn't necessarily better when set higher—around 20°C is the most comfortable for the human body.