A/C Problem - Climate Control Unit - Page 2

Aug 27, 2015 | 05:22 PM

#26

mortgagemagic

Junior Member

Joined: Jul 2009

Posts: 33

Likes: 0

S500 4matic

aIs0 since y0u ran the vaIues, when it was just 32F , y0ur SunSens0r, w0uId n0t engage
y0ur A/C, y0u need t0 check y0ur system when its h0t 0utside, t0 get y0ur reaI vaIues

Aug 27, 2015 | 06:24 PM

#27

michalk

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.

Apr 25, 2016 | 12:16 PM

#28

hbs600

Newbie

Joined: Aug 2006

Posts: 14

Likes: 1

From: Stafford, VA, USA

2002 S600

Quote:

Originally Posted by hedalan

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

I was able to get that red light out and have my AC flowing correctly, just in time for the warm temps. Thanks again for your valuable information.

Apr 25, 2016 | 04:32 PM

#29

kraut56

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!

Jul 28, 2016 | 11:07 AM

#30

eljeffeC230K

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-

Jan 19, 2017 | 11:49 AM

#31

Angrp55

Newbie

Joined: Feb 2016

Posts: 2

Likes: 0

S430 2000

Quote:

Originally Posted by Jezza

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 buy new regulator and did test on nlower it work fine but still no ac or heat coming out vents help

Oct 17, 2018 | 01:34 PM

#32

akhmedovy

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

Oct 17, 2018 | 02:00 PM

#33

kraut56

Super Member

Joined: Sep 2012

Posts: 690

Likes: 76

From: Montreal, Quebec

2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M

Quote:

Originally Posted by akhmedovy

Why did you change the control panel? Did you read here or search the forums at benzworld about using the control panel to list any faults in the AC system?
Keep throwing parts at it, and you will never succeed!
Read, read & read!