What is the reason for the continuous operation of the Mercedes GLK fan?

[LaRonan]

The reason for the continuous operation of the Mercedes GLK fan is a malfunctioning thermostat. Below is an introduction to the related content: 1. Working principle of the thermostat: The thermostat automatically adjusts the amount of water entering the radiator based on the temperature of the coolant, changing the circulation range of the water to regulate the cooling capacity of the radiator, ensuring the engine operates within an appropriate temperature range. The thermostat must maintain good technical condition; otherwise, it will severely affect the normal operation of the engine. 2. Thermostat failure: Thermostat failure prevents water from being sent to the radiator even when the temperature reaches the base level, or the amount of water sent is too little, causing the engine to overheat and the electronic fan to operate continuously.