A/C Problem - Climate Control Unit
Junior Member
Joined: Feb 2009
Posts: 34
Likes: 5
2004 E55 AMG
Wow. Thanks. I was hoping there would be a line in there somewhere to read the compressor duty. I'll be looking at the dew point temperature to see if that's mapping to the evaporator temps I'm seeing.
Newbie
Joined: Aug 2006
Posts: 14
Likes: 1
From: Stafford, VA, USA
2002 S600
Thank you for the info posted on this site - I was able to fix an Air Conditioning problem by reading the conversations related to someone else's issue - my "AC off" button (red light) would not turn off and the compressor would not engage so there was no cold air. By setting the left temp to "HI" and the right setting to "LO" and then hold down "REST" and the "Charcoal Filter" button down at the same time for approx 5 seconds, I was able to see 3 error codes (toggle the error code by using the right temp setting button). Once I pushed the two round "Auto" buttons (this button also changes the air flow positions) - by doing that it reset the codes and my AC started to operate normally - I think the problem started when a radiator hose popped and an auto shop replaced it. This was in the winter so I didn't notice the light on for 3 weeks and I think they may have unplugged something and created a problem. Now one of two things will happen, this will continue to work and life goes on or the light will come on again and I will now know the problem is its not with the controller (that MB dealer told it was - $1000 repair). Now I will be able to research the error code my self and be an educated consumer.
Does anyone know where I could find the error code list?
1458 = Right Foot Well Flap Actuator
1464 = Right Center Flap Actuator
1256 = Evaporator Temp Sensor Front
Does anyone know where I could find the error code list?
1458 = Right Foot Well Flap Actuator
1464 = Right Center Flap Actuator
1256 = Evaporator Temp Sensor Front
Super Member
Joined: Sep 2012
Posts: 690
Likes: 76
From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
On my S600, after winter storage, the red ACoff came on and could not be extinguished by cycling the button.
Of course no cooling.
Went into WIS and found AF83.40-P-2400A, which basically said that this is an un-annuncicated software error in the AC control unit.
Followed in Xentry the rather deep level instructions to delete the fault memory in the controller, and all is well again.
PS: my initial reaction would have been to add a can of R134a, but I resisted!
Of course no cooling.
Went into WIS and found AF83.40-P-2400A, which basically said that this is an un-annuncicated software error in the AC control unit.
Followed in Xentry the rather deep level instructions to delete the fault memory in the controller, and all is well again.
PS: my initial reaction would have been to add a can of R134a, but I resisted!
Newbie
Joined: Jul 2016
Posts: 1
Likes: 0
2005 C230K Sedan (W203)/2005 S500 AMG
A/C Control Unit issue
Hello all...
Soooo...I have an 05 C230K (only 56K miles btw!) and absolutely love the car!. One thing I noticed is that when I'm driving with the climate control unit in the off (0) position, the AC light will either come on and blow cold air, or it will start blinking simultaneously as if its freaking out. My partner and I have already reset the unit a few times but it seems to keep doing it every now and then. Correct me if I'm wrong, but I'm guessing it could be a faulty climate control unit and needs to be replaced or the temperature sensor just needs to be cleaned.
Any help would be greatly appreciated!!
Thanks!
-J-
Soooo...I have an 05 C230K (only 56K miles btw!) and absolutely love the car!. One thing I noticed is that when I'm driving with the climate control unit in the off (0) position, the AC light will either come on and blow cold air, or it will start blinking simultaneously as if its freaking out. My partner and I have already reset the unit a few times but it seems to keep doing it every now and then. Correct me if I'm wrong, but I'm guessing it could be a faulty climate control unit and needs to be replaced or the temperature sensor just needs to be cleaned.
Any help would be greatly appreciated!!
Thanks!
-J-
Newbie
Joined: Feb 2016
Posts: 2
Likes: 0
S430 2000
Guys, while we can access the codes, is there a way to reset the climate unit DIY? (On an early '99 430)
I ask as i have been having problems with my fan motor recently, and while playing with it disconnected it from the regulator which caused the EC light to come on perminently. It was due a service anyway, so while in they simply reset this for free and its been great since.
However, like a total fool i have just done the same thing this evening
Wondering if i can save myself a trip to the dealer?
I ask as i have been having problems with my fan motor recently, and while playing with it disconnected it from the regulator which caused the EC light to come on perminently. It was due a service anyway, so while in they simply reset this for free and its been great since.
However, like a total fool i have just done the same thing this evening
Wondering if i can save myself a trip to the dealer?
Newbie
Joined: Oct 2018
Posts: 1
Likes: 0
S430 4matic
I have 2006 MB S430 4matic and I have a problem with my climate control seems like A/C is working fine but as soon as I change the temperature from low to up even if its 1 degree it starts blowing hot, I already changed the control panel didn't help
Super Member
Joined: Sep 2012
Posts: 690
Likes: 76
From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
Keep throwing parts at it, and you will never succeed!
Read, read & read!
