High speed fan issue

[Motantawi]

I have been experiencing with my Mercedes Benz c250 2012. After driving the car for approximately 30 minutes, I have noticed that the high-speed fan continues to operate for an extended period of time. Despite my efforts in checking various parts of the car like:
Fan control unit
Fan bearings
alternator
Pulley / tensioner
Pressure sensor
Climate control modules
Bad fan wires
AC compressor
AC temperature sensor
and even replacing the engine's ECU, the issue remains unresolved

What should i do to resolve this issue?

 

[coca-light]

First of all: hello,…

I have been experiencing with my Mercedes Benz c250 2012. After driving the car for approximately 30 minutes, I have noticed that the high-speed fan continues to operate for an extended period of time. …

How long is this „extended period“ ?
At what Coolant Temperature?

 

[coca-light]

…
and even replacing the engine's ECU, the issue remains unresolved…

Sorry, but it's doubtful to me that someone would just swap out an ECU on a trial basis…

 

[Motantawi]

First of all: hello,…

How long is this “extended period”?
At what Coolant Temperature?

For more than 1 hour and the coolant temperature from 80 to 90

 

[Motantawi]

Sorry, but it's doubtful to me that someone would just swap out an ECU on a trial basis…

It wasn't for trial, after i checked the list i wrote previously the workshop dealership advised to change the ECU as for a last solution

 

[coca-light]

…Despite my efforts in checking various parts of the car like:
Fan control unit

How was the Fan Control Unit checked?

Fan bearings

can be excluded anyway

alternator
Pulley / tensioner

can be excluded too anyway

Pressure sensor
Climate control modules

How were these two points checked?

Bad fan wires
AC compressor
AC temperature sensor

How were these three points checked?

and even replacing the engine's ECU, the issue remains unresolved

Someone has to pay for this expensive undertaking…
and certainly not the workshop.

I can't believe a workshop would replace the ECU in cases like this.
How much was the invoice amount for this?

I think it's more likely that a software update was installed.

Because the topic of “constantly running fan” is well known.
In some cases, a ECU software update helped.

In other cases it was a temperature or pressure sensor error, but these sensor failues are noticeable on the diagnostic device.

You would have to know exactly what is currently in the Star Diagnosis error log and its plausibility!

 

[coca-light]

It wasn't for trial, after i checked the list i wrote previously the workshop dealership advised to change the ECU as for a last solution

Who payed this „solution“ and how much?