How to reset a deactivated a/c?
Thread Starter
Junior Member
Joined: Sep 2002
Posts: 58
Likes: 1
From: Detroit, MI
2007 R350
How to reset a deactivated a/c?
Hi,
my a/c stopped working due to low R134a. The EC button is lit. I got the system refilled by a local mechanic and now I need to find out how to reset the a/c as to make the compressor turn on again.
Anybody having some ideas?
Thanks in advance.
my a/c stopped working due to low R134a. The EC button is lit. I got the system refilled by a local mechanic and now I need to find out how to reset the a/c as to make the compressor turn on again.
Anybody having some ideas?
Thanks in advance.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
It should come alive all on it's own if you have correct refrigerant pressure. The system has a refrigerant pressure switch to protect the compressor.
You can try a controller reset
https://mbworld.org/forums/c-class-w...tic+easter+egg
You can try a controller reset
https://mbworld.org/forums/c-class-w...tic+easter+egg
Member
Joined: Feb 2010
Posts: 195
Likes: 0
From: VA
2005 c230k ss, 2005 Land Rover LR3, 2006 Honda S2000
At least in the w210, when the ec is on you must do the reset before the compressor will kick back on. The ec light is activated (compressor off) to prevent damage. Im sure the procedure is somewhat the same on the R-class. check out the R-class forum or the w210 for more info.
Member
Joined: Feb 2006
Posts: 233
Likes: 0
02' C230k Sport Coupe
It should come alive all on it's own if you have correct refrigerant pressure. The system has a refrigerant pressure switch to protect the compressor.
You can try a controller reset
https://mbworld.org/forums/c-class-w...tic+easter+egg
You can try a controller reset
https://mbworld.org/forums/c-class-w...tic+easter+egg
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Thread Starter
Junior Member
Joined: Sep 2002
Posts: 58
Likes: 1
From: Detroit, MI
2007 R350
Well, the compressor is actually running but not creating pressure according to my mechanic. The light is still lit.
I'll drive around for a few more days and then I wilh have to bite the bullet and bring it to the dealer.
I'll drive around for a few more days and then I wilh have to bite the bullet and bring it to the dealer.
Newbie
Joined: Feb 2008
Posts: 4
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C230 K Coupe
Sorry if this response will be disappointing - I had the same problem on my 2002 c230 coup and no fiddling with buttons would get the ac/rest unstuck, and local shop had the qeuipment necessary to reset it. I paid 1hr labor ($100) at the dealership for them to reset that light.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The A/c should not need readaption but who knows
Does your circuit look like this & does the low & high side read correctly?
Does your circuit look like this & does the low & high side read correctly?
Newbie
Joined: Feb 2008
Posts: 4
Likes: 0
C230 K Coupe
The reason why the AC/REST light needs to be reset first is that you cannot recharge the system while the compressor is turned off, and the compressor is off as long as the AC/REST block is in place. There is no way the system will unblock itself automatically (or magically)
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Not true - done it many times. I should point out that there were changes made to the W203 a/c system & you might be correct on very early cars - not on newer ones.
Last edited by Glyn M Ruck; Aug 17, 2010 at 06:45 AM.
Super Member
Joined: May 2008
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W203
Sorry if this response will be disappointing - I had the same problem on my 2002 c230 coup and no fiddling with buttons would get the ac/rest unstuck, and local shop had the qeuipment necessary to reset it. I paid 1hr labor ($100) at the dealership for them to reset that light.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Please let us know what you find. Your car like mine has the unintuitive light on = a/c off - yes? Newer cars are the reverse. Cars I have worked on have always come alive with correct refrigeration pressure as long as no other fault existed. I would like to establish whether this is MY dependent.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Kindly posted by splinter on another thread. As you can see there is a potential reset/recode to be done.
MBWorld Fanatic!
Joined: Sep 2010
Posts: 1,089
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From: Salt Lake City, UT
2010 Mercedes-Benz E350
It should come alive all on it's own if you have correct refrigerant pressure. The system has a refrigerant pressure switch to protect the compressor.
You can try a controller reset
https://mbworld.org/forums/c-class-w...tic+easter+egg
You can try a controller reset
https://mbworld.org/forums/c-class-w...tic+easter+egg
Junior Member
Joined: Dec 2008
Posts: 35
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From: Rochester, New York
2014 E350 4Matic
I had done a recharge with correct pressure without luck.
Junior Member
Joined: Dec 2008
Posts: 35
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From: Rochester, New York
2014 E350 4Matic
Junior Member
Joined: Jun 2008
Posts: 21
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From: Satellite Beach, FL
2017 GLS 450
I have a 2003 C230 sedan, did the procedure and it went through a diagnosis which was evident by the blowing of air through different vents. The bad part was that it did not unlock the red light that indicates the a/c is off. Is a trip to the dealership the only way to unlock this? A few weekends ago I used a vacumn to empty the system and attempted to recharge but could barely get any gas into the system without the pressure getting too high. I figured this light being on was somehow preventing me from recharging the system. Really hoping there is a diy as I hate the dealerships prices. Thanks
