S-Class W222 Cooling Fan Running Continuously

[mattkh]

That means the A/C pressure is NOT low, there goes my research..!
Please confirm that your car is a W224 (not a W222).
Why would your very modern car not use a CAN signal for the fan, as you understand..?

 

[GerryK]

Its definitely W222 as the latest one (2021) is W223. Yes it looks like the cooling fan in this model is on the bus. I doubt the overtemperature warning would be displayed if the problem had anything to do with the A/C. Thanks for your input.

 

[barry jones]

Smells better but still a smell of the odour elliminator...will let you know further end of week

That fades away... it'll be fine in a few days... try and air the car as much as possible

 

[GerryK]

Thank you Barry! It works..brilliant...like being at the seaside now..

 

[barry jones]

Thank you Barry! It works..brilliant...like being at the seaside now..

Glad to hear it... I was amazed with mine too... I got the "new leather" aroma... just like a new car now!!

 

[GerryK]

Amazing thing is that the heater works much better now. Set at 19 degrees it is now warm enough. Before I had it set to 22.

 

[Cam786]

Hi, did you have any luck with sorting this coolant issue as I have the same problem? The fan kicks in on a cold start and car shows the coolant icon but the coolant level is fine. I'm guessing its a faulty sensor but not completely sure.
Thanks in advance!

 

[alexanderfoti]

Coolant icon warning on the dash is telling you the fan module is open circuit or failed. Fan module will run the fan at 100% in the absence of any comms from the ECU.

Fan module is part of the fan+frame.

 

[bogdandol]

Hi guys, have you managed to fix this issue? i have the same problem, went to merc independent with star xentry, he told me to replace radiator fan. I replaced radiator fan, reset DTCs and the fan still kicks in at 100%.

This issue came in after driving a full day in rain behind other cars, after a few days the fan sorted itself out then yesterday it started raining again and 20 mins later the fan started kicking in again and doesn't stop anymore unless i switch the engine off.
Was told by my mechanic to try replacing the ac pressure sensor but honestly i highly doubt it's that.
Personally i think the issue might be with the fan actuator that commands the shutters to open and close.

 

[mattkh]

This issue came in after driving a full day in rain behind other cars, after a few days the fan sorted itself out then yesterday it started raining again and 20 mins later the fan started

This rings a bell. It is to do with water getting into the fan controller at the front of the car.

 

[Srdl]

This rings a bell. It is to do with water getting into the fan controller at the front of the car.

Interesting - I had the same problem with mine for about 24 hours a month or so back. It corrected itself and hasn’t been a problem since, However, I did have to go through on of the New Forest fords just before it started so water ingress may have been the problem then until it dried out after a long run the next day.