2004 s500, a/c from center vent, heat from side vent
Thread Starter
Junior Member
Joined: Oct 2010
Posts: 26
Likes: 2
1998 e430
2004 s500, a/c from center vent, heat from side vent
Good morning. I have a 2004 s500. The problem is that I can get a/c out the center vent but warm air comes out the side vent. Also it seems like the a/c has to be set in the low 50's to get it cool. I had the a/c checked and serviced. I've looked at several posts and it seems as though the problem is likely the duo valve. Haven't cleaned the duo valve yet. I did clean the valve on my 98 E430 and it seems to be very similar. Am I on the right track or am I missing something? Thanks
Here is some more info from some checking I did yesterday:
When checked the outside air temp was 51F.
I set the climate control on Auto with temp for both sides set at 60F. The wheel on the center vent was set to A. The results of checking the temp at each vent were:
Left side - 90F
Right side - 110F
Center - 80F
I then set it to 54F with the the wheel on the center vent still set on A with the following results:
Left side - 90F
Right side - 100F
Center - 80F
I then turned the center vent wheel all the way to the blue:
Left side - 90F
Right side - 100F
Center - 58F
I had the A/C checked at an A/C shop. He checked pressure, leaks etc. Everything checked out.
Here is some more info from some checking I did yesterday:
When checked the outside air temp was 51F.
I set the climate control on Auto with temp for both sides set at 60F. The wheel on the center vent was set to A. The results of checking the temp at each vent were:
Left side - 90F
Right side - 110F
Center - 80F
I then set it to 54F with the the wheel on the center vent still set on A with the following results:
Left side - 90F
Right side - 100F
Center - 80F
I then turned the center vent wheel all the way to the blue:
Left side - 90F
Right side - 100F
Center - 58F
I had the A/C checked at an A/C shop. He checked pressure, leaks etc. Everything checked out.
Last edited by vincent52100; Nov 13, 2016 at 12:20 PM. Reason: Added info
Super Member
Joined: Aug 2010
Posts: 986
Likes: 6
From: Kingsville Ontario (South of Detroit)
2003 S500 4Matic (SOLD) + 2004 S55 (SOLD) 2005 CLK 500 Cabriolet 2008 S 450
Been there done that, have the T-shirt. Hard to believe but your problem is likely the cabin temperature sensor which is located in the interior light fixture. Either the tiny thin wire is broken or the sensor is kaput. To my knowledge the sensor by itself is not available and you need to change the whole interior light assembly. They used to be readily available on eBay. No guarantee but this is what needed to be done to fix mine.
Thread Starter
Junior Member
Joined: Oct 2010
Posts: 26
Likes: 2
1998 e430
Well, tried the cabin sensor. Fixed the wire (don't know if it was broken or I broke it) but it didn't do anything. Pressed the REST button and wrote the codes down.
NR. 00 22.0
01 +0.0
02 +18.0
03 +44.9
04 +49.4
05 +10.1
06 +71
07 5.5 Bar
08 +17.3
09 +8.3K
10 2.64
Thanks for any help.
NR. 00 22.0
01 +0.0
02 +18.0
03 +44.9
04 +49.4
05 +10.1
06 +71
07 5.5 Bar
08 +17.3
09 +8.3K
10 2.64
Thanks for any help.
Super Member
Joined: Jun 2016
Posts: 589
Likes: 60
From: Snowville, ID
W212 E350; W166 GLC300; W164 ML550; W164 ML63; W221 S65; W220 S430; Escalade ESV
Perhaps your sensor is bad?
01 should not read zero...
01: Overhead control panel for in-car temperature sensor
01 should not read zero...
01: Overhead control panel for in-car temperature sensor
