ArgoNogrA

Hello,

My W213 (2017) was standing almost still since Jan and today in warm weather (+26C) I noticed that AC is not blowing cold air (only regular cool wind from outside).
Also Front Fan gets really loud when engine is on.

Can front fan go on max because AC fluid is out or it is not related?

Side note - on Dash I have 80days late Service A6 with is scheduled for beginning of next month. Is there might be some fluids that are changed in A6 service that affects radiator and its cooling system besides air filters that should not be related to this?

ua549

The fan speed is high when the set temperature is different from the actual cabin temperature and the control is on automatic.
Make sure the AC is enabled. The AC switch light should be illuminated.

ArgoNogrA

Thank you for your replay.

Dash outside temperature was +23,5C
Climate control temperature was set to 16
Sync was ON
Windows and roof was closed
AC light was ON
Auto was ON

There was no difference if AC light was on or OFF so AC is not working. I remember last summer when climate control was blowing super cold air even when Climate control was set to 19 outside was 25C and roof was open.
Also there was no such loud noise from radiator fan.

Sound from radiator fan is same loudness as if I would drive aggressively for a while on S+ mode. But I was driving on E and C

The G Man

Your radiator fan should not cause your AC to fail, if the fan is bad, your engine would overheat. Are you sure the noise is not from the AC compressor? I would also check your AC refrigerant level.

ArgoNogrA

Apologies for dumb question but where do I check for AC refrigerant level?

Today while car was still I turned engine on and was idle for 10 minutes.
I turned manually OFF Climate control completely.
After about 5-8 minutes fan started to spin louder.
Now I'm sure that the loud sound makes the Radiator fan (in-front of engine) not the small one next to the air filters.

I have feeling it is two unrelated problems here.

My dealership is 350 km away. Now I'm worried to travel such distance if it can put stress on engine. What can/should I check besides coolant level?

JTK44

The big fan is controlled by a thermostat to prevent overheating of the engine. The fan can go on even if the AC is not engaged.

The G Man

The dealer has to hook up a gauge to measure refrigerant level. Does the coolant or oil temp go up pass normal during long trips? You might just have a bad fan bearing and the fan is still functional.

ddeliber

Most reasonable mechanics can do a pressure and refrigerant check. This is not a Mercedes special item - 2 standard fittings on the AC system (one low pressure one high) and common equipment to hook up. Press one button on the machine to test the pressure, if it holds press another to fill it up. Yes it requires a little experience but this is not even minor surgery. They should also be able to tell if there is an issue with the compressor by seeing if it engages properly. Not as easy as an oil change but not that much more difficult either. If it is leaking or there is an issue with the compressor and you are concerned about the mechanic fixing things see how long it will hold, and decide if you can hold off until you get to your trusted dealer/mechanic.
The fan blowing full all the time is a bit of a concern, maybe a stuck thermostat (hopefully) or as someone else suggested a fan motor on its way out. If the car is not moving and just idling then the fan will need to run to get airflow over the radiator and other air cooled equipment. It would be more of a concern if the fan was running constantly while driving. Also as suggested you should be able to check the engine temp to see if it is running hot.

JakeW213

Sounds like your AC compressor is dead. I just had a similar issue and got it replaced with a refurbed one. AC is working again and is a blessing when it gets warm

ArgoNogrA

Just for update and post closure in case someone reads it..

Got out from Dealer yesterday and was informed that the fault was AC COMPRESSOR SENSOR
Diagnostics and replacement cost was 300€



Considering the service fee for sensor change I would not want to know price of Condenser replacement or other parts 🤭


Thank you all for your help and input.
Much appreciated!!!❤️

ddeliber

I'm glad that you got it taken care of and that it wasn't too much. Just out of curiosity can you clarify a couple points from the bill, I don't understand the language so I was interested:
1) is the labor rate 85 Euro/hr minus a 20% discount and are there multiple different types of labor rates in there or are there a few different items in the list separate from the sensor work?
2) What country is the dealer in and is this from a Mercedes dealer?
3) Is the A service that you mentioned earlier included in this?

ArgoNogrA

1) Labor (rates seems differ by task) - discount
2) Estonia (Oficial MB dealer)
3) It was only AC diagnostic and repair. A5 i got quote 628,14 (104,69VAT) and A6 service which I actually require ​​​​​ would be 710€, (as brake fluid change will be added).

ddeliber

Thanks!

In case you are curious, my local dealer charges $220/hr zero discount. I am sure that mine is not the most expensive.

I am not trying to one up you here, I just find it interesting.

ArgoNogrA

Understandable.
Prices of goods and services are correlated to local market.
Price without understanding purchase power is just a number)

..220/hour here considering average wages would be madness thou 🙈