Mercedes C Klasse Overheating Issue

Overheating and a check engine light, eh Sounds familiar I had a similar issue with my C Klasse The first thing I'd check is the thermal switch Is the fan motor making any weird fan noise, or is it just completely dead Sometimes, a faulty thermal switch can prevent the radiator fan from kicking in Have you checked the coolant level And the car radiator itself - is it clogged with debris

Thanks for the quick reply The fan motor seems totally dead, no fan noise at all Where exactly is the thermal switch located And how would I check if the car radiator is clogged

Okay, completely dead fan motor is a key clue The thermal switch is usually located on the radiator itself, or sometimes on the engine block near where the coolant exits You should see a wire connected to it Visually inspect the radiator from the front for any obvious blockage – leaves, bugs, etc If you can't see through the fins easily, it might be clogged But with a dead fan motor and no fan noise, it really does sound like either the motor itself or the thermal switch Honestly, I'd suggest taking it to a workshop Could be a simple fix, but chasing electrical issues can be a pain without the right tools

Yep, I think you're right Dropped it off at the workshop today Turns out it was a defective speed sensor, just like I suspected Cost me 250€ to fix, but at least she's running cool again Thanks for the help