AC blows hot on drivers side cold on passenger side
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Joined: Apr 2015
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From: denver colorado
2001 s500 with amg factory sport package (black)
AC blows hot on drivers side cold on passenger side
Hello, kinda new to my s500 w220. Its a 2001 year. My ac blows hot air only on drivers side vents and cold on passenger side. I get a code KLA 1417 on the climate control head. I have changed out my dual valve with on from a junkyard car, same issue no change. Ive changed the outside sun sensor again from junkyard car, same issue no change. Ive checked the inside temp sensor and it checks good via continuity. If i remove the larger solenoid connector at the dual valve while car is running and check voltage i have 2.89 volts at the plug. If i put my hands on the two smaller solenoids on the dual valve while the car is running the solenoid closest to the firewall is hot and the other one is luke warm. Ive been trying to fix this for months with no success. I hope ive posted this in the right place. Thanks for any help.
Fish
Fish
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Joined: Apr 2015
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From: denver colorado
2001 s500 with amg factory sport package (black)
If i post all of the nr. Numbers from the ac head would anyone be able to make sense of the info for me? Ive read different forums on this site about this similar issue for a few hours and i still cant find a fix
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Joined: Jun 2016
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From: Snowville, ID
W212 E350; W166 GLC300; W164 ML550; W164 ML63; W221 S65; W220 S430; Escalade ESV
What were the temperature settings when you get hot air? Do you get cold air when you set you're temperature setting to LO? What about HI? By changing your temperature settings you can eliminate the sensor issue. Good luck.
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From: denver colorado
2001 s500 with amg factory sport package (black)
It doesn't matter where the settings are. Automatic or hi or low or manual. It is always blowing hot air. I cant ever feel cold air on the drivers side. Even if im in the door flapper check mode and i move the flappers from close to open or 0% to 100%
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Joined: Dec 2012
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Is the tiny red light ON in the AC button? Light ON means that the AC is OFF.
If the light is off with the engine running and the AC on, carefully feel the lines from the AC compressor (stay away from moving and hot parts!). One line should be cold, the other very hot (caution!). If both lines are the same temperature, the refrigeration system is not working. If one line is cold, the refrigeration system is working, and the problem is in the HVAC control system or box.
EDIT: Sorry - just realized that you get cold on one side, hot on the other - you can ignore this answer!
If the light is off with the engine running and the AC on, carefully feel the lines from the AC compressor (stay away from moving and hot parts!). One line should be cold, the other very hot (caution!). If both lines are the same temperature, the refrigeration system is not working. If one line is cold, the refrigeration system is working, and the problem is in the HVAC control system or box.
EDIT: Sorry - just realized that you get cold on one side, hot on the other - you can ignore this answer!
Last edited by wallyp; Jul 4, 2016 at 12:24 PM.
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Super Member
Joined: Jun 2016
Posts: 589
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From: Snowville, ID
W212 E350; W166 GLC300; W164 ML550; W164 ML63; W221 S65; W220 S430; Escalade ESV
My rear right passenger side blow hot air on all temperature settings except for LO. Front left, front right and rear left work fine. I tried to locate a sensor but couldn't find one.
Today I found out that I don't have that problem anymore. DTC reset with OBDII reader is the only thing that did to the car that might have an effect. It worth a try...
Today I found out that I don't have that problem anymore. DTC reset with OBDII reader is the only thing that did to the car that might have an effect. It worth a try...
Thread Starter
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From: denver colorado
2001 s500 with amg factory sport package (black)
I think im supposed to have 12 volts at the large solenoid on the dual valve but i only have 2.8 volts. Im not sure where that voltage is supposed to come from? The left SAM?
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From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
The the two "small" solenoids are for the left and right side water valves, these should see the same voltage for on and off.
Not sure if they get powered on for heat, or vice-versa; you can measure that on selection.
Good luck!
MBWorld Fanatic!
Joined: Dec 2012
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
My S430 does the same sort of thing, but on the passenger side. My wife now just closes the vent, then puts the temp to LOW for that trip. Next day, things are usually back to normal.
As soon as I find my round tuit, I'll see about fixing it - if I can catch the system when it is broken.
As soon as I find my round tuit, I'll see about fixing it - if I can catch the system when it is broken.
Thread Starter
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From: denver colorado
2001 s500 with amg factory sport package (black)
Every vent is closed that pushes hot air. I wish mine went back to normal after the next day but this has been going on for a month now. Its my daily driver
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From: denver colorado
2001 s500 with amg factory sport package (black)
Any other ideas or thoughts? There has got to be someone on this site that know what i should check next. Ive read alot of forums here and ive read some smart replies from people. I live in Denver Colorado so if anyone on here has a shop i could bring it by to scan the star system?
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From: Miami, FL
2003 CL 600
That code shows a left duo valve fault. I'd suggest swapping out that heater valve first, if it's mechanically stuck open it won't matter what you do, it won't stop coolant flow and give you pure cold air.
You may be able to pinch off the heater line going to that duo valve and test my theory, I vaguely remember the hoses being separate when I was in there last on my w215.
You may be able to pinch off the heater line going to that duo valve and test my theory, I vaguely remember the hoses being separate when I was in there last on my w215.
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From: denver colorado
2001 s500 with amg factory sport package (black)
I put a different dual valve in and it was the same problem. How much voltage should the resurculating pump have? What opens and closes the dual valve solenoids? Thanks for the help. This is good stuff
Super Member
Joined: Jun 2016
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From: Snowville, ID
W212 E350; W166 GLC300; W164 ML550; W164 ML63; W221 S65; W220 S430; Escalade ESV
If I was you I would find someone with STAR system or pay the dealer the diagnostic fee. I think I'm at that point right now with my power trunk issue. I paid the diagnostic fee already and I think I will end up having to pay the dealer to fix it. Sometimes we just can't fix everything on our own.
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From: denver colorado
2001 s500 with amg factory sport package (black)
Im not ready to give up yet. With the info ive posted and voltages i know someone on this forum could tell me to check something i havent checked yet. And if you need more info just ask and i can check whatever. Thanks
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
Determined. I like you.
I thought about your issue some more and I ran into this pic. Can you swap #18 and #19 to see if the problem change?
My trunk problem: trunk won't raise or lower. The pump gets no signals to tell it to turn on.
I can't see any broken wire and I have to admit that I haven't ohm every wire yet. I can't figure out which wire to ohm.
I thought about your issue some more and I ran into this pic. Can you swap #18 and #19 to see if the problem change?
My trunk problem: trunk won't raise or lower. The pump gets no signals to tell it to turn on.
I can't see any broken wire and I have to admit that I haven't ohm every wire yet. I can't figure out which wire to ohm.
