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After a travel, the radiator fan in the 2019 W205 model operates at high speed immediately after the ignition is switched off.


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I purchased a 2019 Mercedes C200 AMG W205 sedan with a petrol engine and 32,000 kilometres on it.
The radiator fan operates at high speed for about 6-7 minutes after the ignition is switched off after any travel, even a short one.
Visited my independent Mercedes shop this afternoon. They used a diagnostic instrument but could not detect any problem codes. Advised me to monitor the situation.
Should I be worried about this, or should I just accept it and trust that it won't damage the battery in the long run?

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If the vehicle was a diesel, it likely initiated a particle filter regeneration process when you turned it off. Some petrols contain them too, and yours is one among them. Mercedes-Benz M260/M264 engine - Wikipedia
It's surprising that the MB Garage couldn't resolve it.

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Thank you everybody for your suggestions.

After running the fan for 6 minutes on a crisp autumn morning after a 3-mile trip, I decided to contact the service department of my local Mercedes-Benz dealership. The service manager provided me with timely, informative, and useful advise.This conduct is abnormal and indicates that something is wrong. Upon inspecting the computer, he confirmed that my model has the most recent software capable of transmitting engine information directly to their MB computer. He identified two error codes generated earlier in the day: Radiator Flap and DPF Regen. Despite being a petrol car, it is one of the first models to have a DPF. Additionally, a software update is needed, which will be performed after determining the root causes of the error codes.

The local Main Dealer will do a comprehensive diagnostic check and provide a repair cost report next week for a fee of £99, which I plan to ultimately reclaim via a warranty claim.

I will provide a final update to terminate this topic after the work is finished.

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Here is my update after the diagnostic conducted by the local Mercedes store today, which cost £99.

Initially, they examined the radiator flap operation and could not identify any problems. They examined and confirmed that the Petrol Particulate Filter (PPF) or Petrol Particulate Filter (GPF) regeneration process is functioning properly. No corrective work is needed.

I was dissatisfied with the response and paid £99 for another test with a negative conclusion. I requested to talk with their maintenance manager for a more detailed explanation.

He was amiable, and throughout our 15-minute conversation, I persistently inquired about the reason of a 6-minute fan overrun in a 3-year-old Mercedes with 32,000 miles every time I switch off the ignition. This led to the following recommendation...

Because I primarily drive the vehicle for short local travels often spanning 2-3 miles, the particulate filter is frequently attempting to initiate a regeneration process to eliminate accumulated soot particles. However, due to insufficient heat to complete its cycle, the fan may continue running for up to 6 minutes after the ignition is switched off.

I'm wondering whether I made a mistake by purchasing a Mercedes with specifications that may not be suitable for my short daily drives now that I am retired. I often use my 20-year-old Z4 for longer excursions. This was his advise.If you don't often take it out for extended drives, this automobile may not be suitable for you.

After spending £22k on the car, I expressed my reluctance to trade it in soon. I inquired about maintaining the PPF regen properly in the meantime. The advice given was to take the car on the motorway for a 40-50 mile run every two weeks, ensuring to keep the revs high rather than just cruising.

Perplexed, I settled my account and departed from the showroom.

Is Mercedes intentionally promoting and selling new petrol vehicles with PPF systems, knowing they are not ideal for owners who do not often drive long distances on highways, if his advice is accurate? No way!

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Currently, they sometimes do so due to more stringent pollution restrictions. Petrol engines often do not have the same problems as diesel engines because their exhaust can reach the necessary temperature for burning off more quickly. However, the original poster found that consistently simply travelling 2-3 miles was insufficient for their needs. The original poster would benefit most from using an electric vehicle to avoid early wear caused by insufficiently warming up the engine.

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I have been consistently driving the automobile for more than 3 months, often on trips ranging from 3 to 5 kilometres. I have confirmed that the prior advise from the dealership is accurate. After around 4-5 weeks of small excursions, the fan begins running excessively again. To address this, I take the vehicle for a 30-mile high-speed drive on the local highway, which addresses the problem.
Despite being a terrific automobile, I am not inclined to switch to an electric vehicle at the moment, but it's something to keep in mind.

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