S-Class W222 Cooling Fan Running Continuously

[GerryK]

Just bought this one..

 

[mattkh]

Just bought this one.. View attachment 64570

Well done.

 

[range rover]

Sounds good.
Thank you...I'll look for it..

Other than this rather disappointing problem, how do you rate the 2016 S Class, I still pine for my W220, the comfort in those cars is outstanding.

 

[rjhoy02]

Could it be the car is attempting a dpf regen? I know of other marques where the cooling fans run as you have described when this is happening

Sent from my SM-A202F using Tapatalk

 

[alexanderfoti]

A sensor is out of spec, open circuit or there is a communication problem with an ecu.

The fan will run at 100% in these cases when the engine is cold.

You may be lucky and get the idea from the code reader linked (if it's in the engine ecu) otherwise it will need xentry or something more advanced

 

[GerryK]

Could it be the car is attempting a dpf regen? I know of other marques where the cooling fans run as you have described when this is happening

Sent from my SM-A202F using Tapatalk

Thank you. The dealer that I purchased it from said the same. Is there some quick fix like friving it for 50 miles or so? All my journeys are less than 10 miles due to the COVID.

 

[GerryK]

A sensor is out of spec, open circuit or there is a communication problem with an ecu.

The fan will run at 100% in these cases when the engine is cold.

You may be lucky and get the idea from the code reader linked (if it's in the engine ecu) otherwise it will need xentry or something more advanced

Thank you. My understanding is that the codes are not displayed from the ecu and that it is a communication problem somewhere.

 

[GerryK]

Other than this rather disappointing problem, how do you rate the 2016 S Class, I still pine for my W220, the comfort in those cars is outstanding.

My last car was a 2012 Jag XKR and a better car than the Merc. Everything worked 100% and the layout of the controls was 100%. There was a lovely large knob for adjusting the fan speed. The heater set at AUTO worked 100% to fill the cabin without hearing the fan. In the Merc, the fan always appears to be running too fast and blows air onto the windscreen continuously. Maybe there is a fault with it (the Jag used blow the air onto the windscreen for the first 3 minutes after starting and the dampers would then change over to the footwell etc). There is not enough hot air blown onto the footwell. The seats in the Jag were far superior to the Merc. and had more control settings. After driving 1 hour in the Merc, my back is sore...this has not happened in any car I have had for the past 20 years!
The windscreen wipers set at AUTO do not wipe quick enough. In the Jag, they were perfect every time.
I hate the gear shift on the steering column! Its actually dangerous...I have hit reverse gear thinking it was the indicator....
I find the rear suspension 'rubbery'. This has been checked by 2 Mercedes garages and they can find nothing wrong so I don't know if is a problem or the air suspension.
Other than the above, the car is a great looking car and overall 'quite' good for not the best in the world!

 

[mattkh]

Have you plugged in the newly bought code reader yet. If so, what is it displaying ?

 

[GerryK]

Will do it at the weekend mattkh....

 

[range rover]

My last car was a 2012 Jag XKR and a better car than the Merc. Everything worked 100% and the layout of the controls was 100%. There was a lovely large knob for adjusting the fan speed. The heater set at AUTO worked 100% to fill the cabin without hearing the fan. In the Merc, the fan always appears to be running too fast and blows air onto the windscreen continuously. Maybe there is a fault with it (the Jag used blow the air onto the windscreen for the first 3 minutes after starting and the dampers would then change over to the footwell etc). There is not enough hot air blown onto the footwell. The seats in the Jag were far superior to the Merc. and had more control settings. After driving 1 hour in the Merc, my back is sore...this has not happened in any car I have had for the past 20 years!
The windscreen wipers set at AUTO do not wipe quick enough. In the Jag, they were perfect every time.
I hate the gear shift on the steering column! Its actually dangerous...I have hit reverse gear thinking it was the indicator....
I find the rear suspension 'rubbery'. This has been checked by 2 Mercedes garages and they can find nothing wrong so I don't know if is a problem or the air suspension.
Other than the above, the car is a great looking car and overall 'quite' good for not the best in the world!

Thank you for that, phew! Now you have me wondering if I have been using those rose tinted glasses again, I must admit i have had a fleeting moment of wonder about the Jaguar I Pace, I do think in the not too distant future they will become much more common.

 

[EmilysDad]

....
I hate the gear shift on the steering column! Its actually dangerous...I have hit reverse gear thinking it was the indicator....
...

Column shifts are not a new thing & not just a Merc thing .... they've been around for years for both manual & auto but people have come to assume that the gear shift/lever should be in the middle. They're not dangerous just different from most. You can try to shift into reverse all you like when moving .... it won't do it

 

[rjhoy02]

Thank you. The dealer that I purchased it from said the same. Is there some quick fix like friving it for 50 miles or so? All my journeys are less than 10 miles due to the COVID.

Normally giving it a good run will be enough to clear it. A run up the motorway to the next junction and back should do it

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[GerryK]

Thank you. Just did that. 30 miles at 2000RPM average. No joy. Overtemperature warning after 5 miles and running at 90 Deg C.

 

[pattiodors]

90c is the normal running temperature, don't know why light is on, maybe showing due to no comms to sam module or ecu as fan is running full tilt as well.

 

[GerryK]

90c is the normal running temperature, don't know why light is on, maybe showing due to no comms to sam module or ecu as fan is running full tilt as well.

Yes there seems to be a comms issue. Both the Merc dealer and the knowledgeable Merc guy said so...

 

[GerryK]

Have you plugged in the newly bought code reader yet. If so, what is it displaying ?

Plugged that in...no fault codes stored..

 

[mattkh]

Thanks.
That is good news. It means the fault is with the pressure sensor in the aircon condenser.
Some people leave the A/C on all the time. When did you last use it.

 

[GerryK]

Thank you. I never use the air con intentionally...it sometimes comes on when I adjust the heating settings but I always turn it off. I don't know if it actually works correctly. One main reason I never use it is ther is an awful sickening smell of dirty socks when it turned on. The dealer has failed to sort it. Greatly appreciated if you have any ideas about this. I think the evaporator is clogged somewhat..
I have had cars with air con before and never had such a problem..
I presume the A/C needs to be drained to exchange the sensor and refilled?

 

[alexanderfoti]

Thanks.
That is good news. It means the fault is with the pressure sensor in the aircon condenser.
Some people leave the A/C on all the time. When did you last use it.

Not with the overtemp warning on the dash. It nerds to go on xentry, potentially internal fault with the fan controller.