Air Condioning wont turn on.
Newbie
Joined: Jul 2020
Posts: 3
Likes: 2
2012 C300
I had the same problem............... local MB dealer wanted to charge me $600. for a new blower motor,and another $300. to install it.
Showed me how the blower was "seized up"..........etc. I did not believe the BS.
Got home,opened the blower housing under the hood,put a DROP of engine oil on the top of the blower shaft,where there was a minor bit of salt dust corrosion. Half a hour later wiped off the oil drop, and everything has worked fine since
Showed me how the blower was "seized up"..........etc. I did not believe the BS.
Got home,opened the blower housing under the hood,put a DROP of engine oil on the top of the blower shaft,where there was a minor bit of salt dust corrosion. Half a hour later wiped off the oil drop, and everything has worked fine since
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 20
Likes: 0
From: Charlotte, NC
2004 S430, 2011 E350 Cabriolet, 2010 GL450
My blower motor is working fine. it's just not cold and the A/C 'on' button won't turn on. The red light is on and won't go off. I'm unsure how to diagnose with in car settings. Think it may be time to pay the man. Too hot to mess around with long repair.
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,150
Likes: 533
Mercedes
You can try just recharging it with a can of Freon and it may get the Freon pressure high enough to turn the compressor back on . But sometimes it requires computer reset
Senior Member
Joined: Apr 2019
Posts: 428
Likes: 96
From: Houston
001 s600, 94 sl600
Since the A/C system indicated low refrigerant, it MUST have additional refrigerant (I believe R-134 for your care), UT, you need to determine if it is 'just a little low' or "near/completely empty.' You can determine which by depressing the 'valve core' in whichever charging port is accessible. Be careful and protect you hands and eyes. Any liquid refrigerant spraying out will instantly freeze skin and eye tissue. NOT GOOD.
'Just a little low' can probably be 'fixed' by adding some more that has a 'leak detecting dye' and 'seal conditioner' in it. The R-134 refrigerant leaked out somewhere---most likely past the compressor shaft seal. The 'leak detecting dye glows brightly when under ultraviolet light.
If the system is near or completely empty, further diagnosis to locate and repair the LEAK is necessary. Time for a good A/C tech to diagnose and repair and recharge the system.
'Just a little low' can probably be 'fixed' by adding some more that has a 'leak detecting dye' and 'seal conditioner' in it. The R-134 refrigerant leaked out somewhere---most likely past the compressor shaft seal. The 'leak detecting dye glows brightly when under ultraviolet light.
If the system is near or completely empty, further diagnosis to locate and repair the LEAK is necessary. Time for a good A/C tech to diagnose and repair and recharge the system.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,473
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Simply adding refrigerant will not normally clear the error code, and the compressor will not start operating until the code is cleared.
It is both illegal and dangerous to release refrigerants into the atmosphere by just depressing a refrigerant valve core, and I do not believe that depressing a valve core will give you any idea about how much refrigerant the system contains - unless it is virtually empty.
Air conditioning techs STRONGLY urge you to NOT put any refrigerant containing any type of sealant into your system.
You can purchase R-134a in a can that is equipped with a gauge, and this can give you a rough idea about how much refrigerant the system contains, but is highly unlikely that using one will get you to anything very close to the correct amount. It is not difficult to service your own system, but you will need a set of gauges, eye protection, and some study so you know what you are doing...
It is both illegal and dangerous to release refrigerants into the atmosphere by just depressing a refrigerant valve core, and I do not believe that depressing a valve core will give you any idea about how much refrigerant the system contains - unless it is virtually empty.
Air conditioning techs STRONGLY urge you to NOT put any refrigerant containing any type of sealant into your system.
You can purchase R-134a in a can that is equipped with a gauge, and this can give you a rough idea about how much refrigerant the system contains, but is highly unlikely that using one will get you to anything very close to the correct amount. It is not difficult to service your own system, but you will need a set of gauges, eye protection, and some study so you know what you are doing...
MBWorld Fanatic!
Joined: Nov 2010
Posts: 2,605
Likes: 343
From: Welwyn, Herts, UK
2006 S600
Guys, get your facts right. Ricebubbles is absolutely your man on climate control. Read these:
https://w220.ee/WIS_83.40_Automatic_...itioning_(HVAC)
https://w220.ee/Automatic_Climate_Co..._Service_Menus
https://www.benzworld.org/threads/w2...menus.1632652/
https://w220.ee/WIS_83.40_Automatic_...itioning_(HVAC)
https://w220.ee/Automatic_Climate_Co..._Service_Menus
https://www.benzworld.org/threads/w2...menus.1632652/
Last edited by Welwynnick; Jul 21, 2020 at 08:17 AM.
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Newbie
Joined: Sep 2020
Posts: 1
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W220 s350
You would check air compressor.
First check aircon gas. It can be use scanner .
It may be compressor broken may be.
Aircon compressor change.
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Thread Starter
Junior Member
Joined: Aug 2016
Posts: 20
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From: Charlotte, NC
2004 S430, 2011 E350 Cabriolet, 2010 GL450
Thanks. I did a freon dye test and the compressor is leaking. So now i need to find a quality OEM part and identify the other parts that i need to replace while it's open. Do I need evaporator, accumulator, orifice/expansion tube, etc.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,473
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
When mine failed, I bought an original compressor from my local pull-a-part for $35 plus a $5 core charge. Was still working perfectly when a deer totalled the car several years later. I replaced only compressor, a full charge of R-134a, and a partial charge of POE oil. I might mention that the system was open to the air only a very few moments until I plugged the hoses. It did take more than just a few moments to change the compressor...
Taking the compressor off in the pull-a-part yard was a valuable learning experience. It also helped that I have a vacuum pump and gauge set.
Taking the compressor off in the pull-a-part yard was a valuable learning experience. It also helped that I have a vacuum pump and gauge set.
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 20
Likes: 0
From: Charlotte, NC
2004 S430, 2011 E350 Cabriolet, 2010 GL450
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,473
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
I believe that all W220 compressors are the same.
TBH, I don't really remember now what I used to plug the hoses - I just automatically plug AC hoses. I have a box full of different plugs and caps...
TBH, I don't really remember now what I used to plug the hoses - I just automatically plug AC hoses. I have a box full of different plugs and caps...
