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jakobschmitz1

Mercedes C Klasse Overheating Issue

My 2003 Mercedes C Klasse with a gasoline engine is acting up The engine's overheating, and the check engine light's on I took a look and it seems like the car radiator fan isn't spinning like it should Could it be a defective speed sensor Any ideas

Summary of the thread

A 2003 Mercedes C Klasse is experiencing engine overheating and a check engine light, with the radiator fan not functioning properly. The initial suspicion is a defective speed sensor. Suggestions include checking the thermal switch and inspecting the radiator for clogs. Ultimately, the issue is confirmed to be a defective speed sensor, which is resolved at a workshop.

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4 comment(s)

emmawolf40

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

jakobschmitz1 (community.author)

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

emmawolf40

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

jakobschmitz1 (community.author)

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

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MERCEDES

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CKLASSE