Ac blowing in one vent
Thread Starter
Junior Member
Joined: Jul 2024
Posts: 21
Likes: 1
2013 Mercedes e350
Ac blowing in one vent
Why is only one of my vents blowing cold air the others are blowing relatively warm compared to that one I just replaced the blower motor and the cabin air filter
MBWorld Fanatic!
Joined: Jan 2023
Posts: 3,142
Likes: 1,205
GLE 580
Probably a stuck or broken blend door actuator. Try moving temps way low and way high several times to see if it loosens it.
Thread Starter
Junior Member
Joined: Jul 2024
Posts: 21
Likes: 1
2013 Mercedes e350
did it like 20 times still same and also the car has freeon and the ac is just not freezing like it should be I also own a 2008 Mercedes c300 and it gets so cold I have to turn down the ac this one does not do that
MBWorld Fanatic!
Joined: Jan 2023
Posts: 3,142
Likes: 1,205
GLE 580
Do you have a diagnostic tool to read the codes? I forgot, also try moving the air around from the various vents too. I know you probably already did that but just want to be sure.
Junior Member
Joined: Jul 2021
Posts: 33
Likes: 13
W212 facelift
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,142
Likes: 1,295
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
If the coil provides cold air for one vent it means it provides it also for all vents that the system settings ask for. It is NOT about low refrigerant in the A/C system, It is about the air flow mixer valves that control air temperature coming out of the vents.
Junior Member
Joined: Jul 2021
Posts: 33
Likes: 13
W212 facelift
There is only one evaporator coil for the A/C to cool the car unless you have the dual system that I think has another one for the rear passengers.
If the coil provides cold air for one vent it means it provides it also for all vents that the system settings ask for. It is NOT about low refrigerant in the A/C system, It is about the air flow mixer valves that control air temperature coming out of the vents.
If the coil provides cold air for one vent it means it provides it also for all vents that the system settings ask for. It is NOT about low refrigerant in the A/C system, It is about the air flow mixer valves that control air temperature coming out of the vents.
Trending Topics
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
W212 sedan has only one coil. If the setting of system has problem, you will get code with xentry or other code reader as Thinktool ... As BMW, only one vent has cool air, in bmw is driver side, and MB as I remember is passenger side is low refrigerant. If low, you must find the leak point to fix this problem, don't only push more gas to your system.
MB World Stories
The Best of Mercedes & AMG
8 Oddball Mercedes Ideas That Actually Made it to Production
Verdad Gallardo
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look
Verdad Gallardo
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish
7 Craziest Things AMG Gas Ever Built
Verdad Gallardo
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know
Verdad Gallardo
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
MBWorld Fanatic!
Joined: May 2021
Posts: 2,528
Likes: 2,045
From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
You need to use diagnostic tools. By "feeling" you are not going to find the problem.
You can:
1 - Get an MB-aware scanner and monitor live data. Also having a set of AC pressure gauges ("free rental" from AutoZone/Advance AutoParts, else)
2 - From the live data check the evaporator temperature when set ot MAXCool, and the engine @1500RPM
3 - Check voltage at the blower is its maximum; otherwise, the blower is not being commanded or it has a regulator problem
4 - If the evaporator temperature reaches @5C or less, your "refrigerant cooling system" is just fine --> focus on air distribution in the cabin (as suggested by several above)
As with any diagnosis: proper tooling, and the ability to dissect the system somewhere, so you can trace back, or follow forward. Without a reference point to make decisions, it becomes guessing.
You can:
1 - Get an MB-aware scanner and monitor live data. Also having a set of AC pressure gauges ("free rental" from AutoZone/Advance AutoParts, else)
2 - From the live data check the evaporator temperature when set ot MAXCool, and the engine @1500RPM
3 - Check voltage at the blower is its maximum; otherwise, the blower is not being commanded or it has a regulator problem
4 - If the evaporator temperature reaches @5C or less, your "refrigerant cooling system" is just fine --> focus on air distribution in the cabin (as suggested by several above)
As with any diagnosis: proper tooling, and the ability to dissect the system somewhere, so you can trace back, or follow forward. Without a reference point to make decisions, it becomes guessing.
