Mercedes GLC Overheating Electric Fan Issue

Overheating is definitely not something to ignore. If the electric fan isn't working correctly on your GLC, it could very well be the cause. The fan is crucial for cooling the engine, especially at lower speeds. When the car is moving fast, air flows through the radiator, but at low speeds, the fan is the main source of cooling. You mentioned a possible cable or plug issue – that's a good place to start looking. Have you checked for any obvious signs of damage to the wiring or if the plug is securely connected? Does the fan ever come on at all, even briefly? Knowing that will help narrow things down.

Thanks for the quick reply By plug, are you referring to the connector attached to the fan motor itself I'm a bit of a novice when it comes to this stuff As for whether the fan comes on at all, it seems intermittent. Sometimes it spins weakly for a bit, then stops. Other times, nothing at all, even when the temperature gauge is heading toward the red zone. Is there a fuse I should check too

Yes, by plug, I mean the electrical connector that attaches to the fan motor. Intermittent operation suggests the connection is loose or corroded, or the motor is failing. It is likely the cable or plug. Checking the fuse is a good idea, the car's manual will list the location of the fan fuse in the fuse box. Given what you've described, it sounds like a professional diagnosis is warranted before you risk further vehicle overheating and potential engine damage. At least you will know the extent of the repair before starting, and a defective cable or plug connection might be around 95€.

Just wanted to give you a massive thank you for your advice You were spot on. I took it to a workshop, and it turned out to be a corroded connector for the electric fan. A simple replacement, and the temperature control is back to normal. The cooling system is working perfectly again. Total cost was indeed around 95€. I really appreciate you pointing me in the right direction