Why does the car heater produce an odor?

[VanLuna]

Car heaters producing odors are mainly caused by excessive air humidity or too much condensation from the air conditioning system. The detailed reasons are as follows: 1. Do not keep the car heater on for extended periods. Prolonged use of the heater in the car can lead to poor air circulation, especially in winter when windows are closed, creating a sealed environment where air circulation is inevitably poor. 2. Avoid setting the heater temperature too high: While driving, if the heater temperature is set too high, it can easily cause drowsiness. Be mindful not to direct the heater vents towards your face, as prolonged exposure to hot air can dry out the air inside the car and significantly harm the skin.