Diagnostic Easter Egg for Climatronic
Senior Member
Joined: May 2006
Posts: 268
Likes: 1
From: VA
2002 C320
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,854
Likes: 197
From: Huntington Beach, Ca.
'17 Jaguar XF
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,854
Likes: 197
From: Huntington Beach, Ca.
'17 Jaguar XF
Here's something I saved from this forum (thanks to the poster)
W203 air conditioning diagnostic mode (C320/C32 only)
--------------------------------------------------------------------------------
Push "0" and "EC/REST" button simultaneously until display changes (approx. 5 seconds)
I've only included the values that may be of interest to owners
00: Interior temp sensor
01: Interior temp sensor
02: Ambient temp sensor
05: Evaporator temp. sensor
06: Engine coolant temp.
07: refrigerant pressure
08: refrigerant temp.
16: carbon monoxide value
17: nitrogen oxide value
18: dewpoint temp.
21: engine RPM
22: vehicle speed
24: battery voltage (very handy)
You just did. Do you hear any clicking or snapping noises while the test is in operation? Do any of your vents fail? Here's a good overview of what's going on thanks to Buellwinkle....
http://www.buellwinkle.com/HVAC-W203.pdf
W203 air conditioning diagnostic mode (C320/C32 only)
--------------------------------------------------------------------------------
Push "0" and "EC/REST" button simultaneously until display changes (approx. 5 seconds)
I've only included the values that may be of interest to owners
00: Interior temp sensor
01: Interior temp sensor
02: Ambient temp sensor
05: Evaporator temp. sensor
06: Engine coolant temp.
07: refrigerant pressure
08: refrigerant temp.
16: carbon monoxide value
17: nitrogen oxide value
18: dewpoint temp.
21: engine RPM
22: vehicle speed
24: battery voltage (very handy)
You just did. Do you hear any clicking or snapping noises while the test is in operation? Do any of your vents fail? Here's a good overview of what's going on thanks to Buellwinkle....
http://www.buellwinkle.com/HVAC-W203.pdf
Senior Member
Joined: May 2006
Posts: 268
Likes: 1
From: VA
2002 C320
Here's something I saved from this forum (thanks to the poster)
W203 air conditioning diagnostic mode (C320/C32 only)
--------------------------------------------------------------------------------
Push "0" and "EC/REST" button simultaneously until display changes (approx. 5 seconds)
I've only included the values that may be of interest to owners
00: Interior temp sensor
01: Interior temp sensor
02: Ambient temp sensor
05: Evaporator temp. sensor
06: Engine coolant temp.
07: refrigerant pressure
08: refrigerant temp.
16: carbon monoxide value
17: nitrogen oxide value
18: dewpoint temp.
21: engine RPM
22: vehicle speed
24: battery voltage (very handy)
You just did. Do you hear any clicking or snapping noises while the test is in operation? Do any of your vents fail? Here's a good overview of what's going on thanks to Buellwinkle....
http://www.buellwinkle.com/HVAC-W203.pdf
W203 air conditioning diagnostic mode (C320/C32 only)
--------------------------------------------------------------------------------
Push "0" and "EC/REST" button simultaneously until display changes (approx. 5 seconds)
I've only included the values that may be of interest to owners
00: Interior temp sensor
01: Interior temp sensor
02: Ambient temp sensor
05: Evaporator temp. sensor
06: Engine coolant temp.
07: refrigerant pressure
08: refrigerant temp.
16: carbon monoxide value
17: nitrogen oxide value
18: dewpoint temp.
21: engine RPM
22: vehicle speed
24: battery voltage (very handy)
You just did. Do you hear any clicking or snapping noises while the test is in operation? Do any of your vents fail? Here's a good overview of what's going on thanks to Buellwinkle....
http://www.buellwinkle.com/HVAC-W203.pdf
No matter where I tell the air to go, the driver footwell vent always blows. This is very annoying in the summer because my feet will be freezing and the rest of me will be hot. Also, the air never 'blasts' out of the main dash vents like you'd expect when the fan is turned all the way up (also annoying in the summer). You hear it rev up, but it doesn't put out much through the vent. What comes out is plenty cold, though.
That being said, I STFF'd and found this thread:
https://mbworld.org/forums/c-class-w...g-hissing.html
Post 18 describes a procedure to fix the flap issue I described above. Do you think that will fix the entire issue, or will the stepper motor also need to be replaced?
Last edited by JLD2k3; Dec 19, 2008 at 08:32 AM. Reason: More info
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,854
Likes: 197
From: Huntington Beach, Ca.
'17 Jaguar XF
It may or may not fix the problem, it's hard to say over the internet. If you do go in to do it, replace both footwell flap actuating arms. I did only one the first time and two years later the other broke. Then my right windshield defrost stepper motor went out. Couldn't get to it to replace so it's just disconnected now. The broken actuating arms made a slight, but noticeable, ticking noise that lasted about 6 or 8 times every time the car was turned on (the system directs air out the footwell vents every time you turn it on). The broken stepper motor made a much louder snapping noise at random times. I understand that noise comes from the internal safety clutch/ratchet working. Once you get the center console and lower dash removed you can reattach just the AC control unit and put it through the synch cycle to watch and test the motors and actuating arms.
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
Someone should sticky this. My Climatronic was acting up and it took me 30 minutes of STFF to find this thread! 
I KNOW there's also an even more-detailed Climatronic configuration thread somewhere in MBW but I can't find it, it's buried in the forums somewhere. Can someone provide a link?
This thread should be merged with this thread.
My cabin is ALWAYS too cold. Can these screens be used to set the bias of the various sensors?
After looking at the PDF file, anyone know if the Charcoal Filter option can be retrofitted by simply switching in a filter box from the wrecker? Looks like a neat little DIY project..
I KNOW there's also an even more-detailed Climatronic configuration thread somewhere in MBW but I can't find it, it's buried in the forums somewhere. Can someone provide a link?
This thread should be merged with this thread.
My cabin is ALWAYS too cold. Can these screens be used to set the bias of the various sensors?
After looking at the PDF file, anyone know if the Charcoal Filter option can be retrofitted by simply switching in a filter box from the wrecker? Looks like a neat little DIY project..
Last edited by slammer111; Mar 16, 2009 at 06:29 AM.
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MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,854
Likes: 197
From: Huntington Beach, Ca.
'17 Jaguar XF
I'm guessing yes, but I believe you'd have to remove the top part of the dash as well as the bottom half! If there's a way to get at it without removing the upper dash I would like to know so I could replace my passenger side defrost vent stepper motor. I leave the charcoal filter on constantly.
Last edited by mleskovar; Mar 16, 2009 at 11:59 AM.
MBWorld Fanatic!
Joined: Oct 2009
Posts: 2,510
Likes: 2
From: bay area, california
Aston Martin V8 Vantage
I was at the dealer yesterday and my technician taught me a secret sauce diagnotisc procedure...
If you have a factory installed Climatronic unit, you can perform a climate control system check, diagnosis, and reset of registers...
Press and hold the "Defrost" and "Recirc" buttons together, and release only when the lights on both buttons start to flash back and forth between them. This procedure starts a system self-diagnosis of all components, sensors, etc., and then resets all the settings to the appropriate normals. He explained all this to me in technospeak, but I didn't catch all the details. The test runs for about 15-20 seconds, then the lights stop flashing as all returns to normal.
Apparently, with use the system "settings" get changed. and can become out of sync, including settings for "Tunnel Mode," on and off trigger points for the compressor, etc. My tech said it should be done twice a year or at least at every A or B service. (yea, like all techs are trained, or remember to do this...)
Before the mod crew asks the obvious question, this easter egg works only with factory installed and configured Climatronic units (I assume with all MB models so equipped). Refits of Climatronic head units to non-climatronic equipped cars likely will not work, obviously because the components behind the bling-bling Climatronic unit are not Climatronic. Try it at your own risk.
If you have a factory installed Climatronic unit, you can perform a climate control system check, diagnosis, and reset of registers...
Press and hold the "Defrost" and "Recirc" buttons together, and release only when the lights on both buttons start to flash back and forth between them. This procedure starts a system self-diagnosis of all components, sensors, etc., and then resets all the settings to the appropriate normals. He explained all this to me in technospeak, but I didn't catch all the details. The test runs for about 15-20 seconds, then the lights stop flashing as all returns to normal.
Apparently, with use the system "settings" get changed. and can become out of sync, including settings for "Tunnel Mode," on and off trigger points for the compressor, etc. My tech said it should be done twice a year or at least at every A or B service. (yea, like all techs are trained, or remember to do this...)
Before the mod crew asks the obvious question, this easter egg works only with factory installed and configured Climatronic units (I assume with all MB models so equipped). Refits of Climatronic head units to non-climatronic equipped cars likely will not work, obviously because the components behind the bling-bling Climatronic unit are not Climatronic. Try it at your own risk.
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Joined: Mar 2007
Posts: 1,948
Likes: 3
From: Houston, TX
C32/C55 AMG
Has anyone had this issue:
Check out the link for the DIY https://mbworld.org/forums/e-class-w...rol-valve.html
Okay, last weekend was frickin hot in So-Cali reaching 90+ and that’s when I first started to experience extremely hot air blowing out from the rear vents (B-pillar and from center console). My front a/c vents were working fine, but the hot air being blown to the rear passenger area was unbearable. I remember seeing several threads of people experiencing the same problem and since my car is no longer under warranty, I decided to tackle the job myself. Thanks to Konigstiger, found the culprit to be with the changeover valve.
Member
Joined: Feb 2014
Posts: 134
Likes: 10
From: New Hampshire
C 32 AMG & FG2 Civic Si
hi guys, does anyone know if it's possible to lock the driver and passenger temperatures together so that I don't have to adjust both all the time? I know on some cars, you can basically disable the dual feature so that the driver controls both temperatures.
thanks!
thanks!
MBWorld Fanatic!
Joined: Feb 2006
Posts: 1,489
Likes: 110
From: WNY
2005 w203 C230
Recirculated air/fresh air flap malfunction
According to this...this test/synchronization is only for the AIR RECIRCULATION FLAP...
It goes on mentioning that this Learn-In is for the MOTORS...
The flashing should stop on the defrost LED.
Switch off ignition AND remove key. Wait 40 seconds +, RESTART.
It goes on mentioning that this Learn-In is for the MOTORS...
The flashing should stop on the defrost LED.
Switch off ignition AND remove key. Wait 40 seconds +, RESTART.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,854
Likes: 197
From: Huntington Beach, Ca.
'17 Jaguar XF
Not sure how you came to this conclusion from that attachment. All the motors and associated flaps are exercised with the test. You can feel the air at each vent as it goes through the cycle.
MBWorld Fanatic!
Joined: Feb 2006
Posts: 1,489
Likes: 110
From: WNY
2005 w203 C230
Based on the [!] In the note;
Title; Recirculated air/fresh air flap malfunction.
Note; [!] "We (DBAG) have noticed that in individual cases the air recirculation flap does not operate properly. For example then set to fresh air, recirculated air is sucked in and vice versa
--------------
I did note that the motorS go thru the learn-in operation, but the main goal according to the attachment seems to be correcting the air recirculation flap.
Title; Recirculated air/fresh air flap malfunction.
Note; [!] "We (DBAG) have noticed that in individual cases the air recirculation flap does not operate properly. For example then set to fresh air, recirculated air is sucked in and vice versa
--------------
I did note that the motorS go thru the learn-in operation, but the main goal according to the attachment seems to be correcting the air recirculation flap.
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From: 🇨🇦
W463 G550 / C190 GTC //prev: W204 C63 507 / R170
What happened to the attachments?
Newbie
Joined: Aug 2009
Posts: 2
Likes: 0
From: NZ
2007 W209 CLK63, 1995 KZJ78 Toyota Landcruiser Prado
W209 Thermotronic modification needed for fresh air
Bob hello. I wonder could you direct me regarding modification of the Thermotronic (Climatronic in USA I believe) (digital) system in my 2007 W209 CLK63 (Coupé). As inane as it seems, this system does NOT allow fresh UN-conditioned air into the car using the Thermotronic-system fan. All modes that activate the fan also engage the air-con (except REST). As I live in a cool, dry climate I NEVER need the air-con function and wish to be able to admit fresh UN-conditioned air into the car without having to open the windows or sunroof. I would be grateful if you know of a modification that will allow the fresh-air/recirculation flap (Motor M2/5) to remain open to draw-in fresh-air with the air-con modes de-selected. Temperature control is also a consideration I would guess! Alternatively, perhaps an additional switch inserted in the signal cable to the compressor could allow manual selection and allow full functionality of the Thermotronic controls, sans running the compressor. No mystery as to why Mercedes cars smell like hockey change-rooms, a terrible design decision! Thank you for your time, and best wishes Bob.
Allen.
Allen.
Newbie
Joined: May 2017
Posts: 1
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W203
I have a W203 (circa 2006) which started to act up recently. With the temperature knob turned to the lowest (around 18); the aircond is running cold. However, when I turn the temperature to something like 19/ 20; hot air starts spewing out.
Have taken it to several mechanics; and their general diagnostic was that it had something to do with the AC Climate Control Unit. What's worse is that they even tried replacing it with some used units. But, the results remains.
Please help
Have taken it to several mechanics; and their general diagnostic was that it had something to do with the AC Climate Control Unit. What's worse is that they even tried replacing it with some used units. But, the results remains.
Please help
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Joined: May 2019
Posts: 1
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From: Houston Tx
2006 CLS 500
revstriker -YOU Are a very funny guy!!! I just LOVED your comment !
