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.

[Florence]

Encountering the issue of a Mercedes-Benz GLK's fan running continuously is quite common, and it can be analyzed from several perspectives. The most frequent cause is a faulty temperature sensor, which is supposed to monitor engine temperature to control the fan's operation. If it malfunctions, it may mistakenly assume the engine is constantly overheating, commanding the fan to run non-stop. The fan control module could also be defective, with components responsible for power supply getting stuck or fused, preventing the fan from disconnecting from the power source. Another reason could be the air conditioning set too high, requiring the AC compressor to work harder for cooling, thus necessitating prolonged fan operation. In older vehicles, electrical shorts or poor grounding might also trigger this issue. Ignoring it could lead to excessive battery drain from the fan's continuous operation and even cause engine overheating, damaging critical components. I recommend first checking if the coolant temperature gauge on the dashboard reads normal and inspecting the coolant level for leaks, then visiting a professional workshop to use diagnostic tools for reading fault codes to accurately pinpoint the problem.

[DiLevi]

I experienced the issue of the fan constantly running while driving my Mercedes-Benz GLK, which was quite puzzling. Typically, this could be due to a faulty temperature sensor, causing the system to mistakenly perceive the engine as overheating and keeping the fan running for cooling. Another possibility is a stuck fan relay, like a switch jammed in the 'on' position and unable to turn off. If the air conditioning is set to high cooling mode, the fan will also run more frequently. A short circuit is even worse, as erratic current flow forces the fan to operate continuously. If not addressed promptly, the fan running non-stop will drain the battery quickly, potentially leaving the car unable to start, and engine overheating could even lead to cylinder head deformation. It's important to stay vigilant—don’t wait for the coolant temperature warning to act. Simple checks like inspecting the coolant level and battery terminals can help, and if issues are found, getting it repaired promptly ensures peace of mind.

[DiEliza]

Buddy, don't ignore the Mercedes GLK's fan running constantly. A failed sensor is the most common culprit—the fan thinks the engine is overheating and needs cooling. If the control module is busted, the fan won't shut off. Running the AC on max cold also keeps the fan spinning. A short circuit can make it act up. Ignoring it can drain the battery, leaving you unable to start the car, or worse, cause engine overheating and part damage. Check if the coolant temp is normal; if not, get it fixed by a pro ASAP.