Question about Mercedes-Benz S-Class

1 Answer

Mercedes-Bnez W221 4-zone HVAC heat stuck left-rear passenger

I have a 2010 S550 with four-zone / rear-seat climate control. The vents for the left-rear passenger are all blowing/venting HOT air. I've tried moving the temperature setting from LO to HI, HI to LO, powering off and on, and tried changing settings from the rear control panel and the front COMAND controller. No change. Pretty much stuck on hot (max hot) for the left-rear seat zone. It's a temperature issue for this seat, the controls from either the rear seat controller or the main COMAND controller function to change where the air is vented to, and the temperature changes work fine for the right-rear passenger from either controller. On any other car I'd assume its a stuck blend door or actuator motor, but with the complexity of these models, I wanted to rule-out a computer calibration issue if that is something to consider? Also, I understand that on some other models there is a way to access error codes from the climate control system. Is that possible on the W221 and if so can you provide that procedure?

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

  • Expert
  • 157 Answers

You really need help from a dealer tech if you cant read it in your own question, i would point out that dealer test equipment is most reliable, and use of service bulletins to find whats the latest fix for this kind of issue on this make and model. you are asking to research and find what he fixes daily. please consult them to get answer if you can.. if they are not available where you are there is always benz world and pelican. some technicians frequent those sites and answer what they can.

Posted on Jun 10, 2014

Ad

5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad
aaangie220
  • 202 Answers

SOURCE: 2004 suburban rear a/c only blows hot air

ase mechanic:
there are separate actuators for the blend doors. one for heat and one for cool. they work opposite and in conjuction with each other, if that makes any sense. ones open, ones close, for each different climate. sounds like the the cold one isn't opening in the rear.

Posted on Jan 29, 2009

  • 1 Answer

SOURCE: Air conditioner blows hot air after 30 seconds on

I have had this problem. I am not a mechanic...so to correct the issue temporarily, I simply turn off the car and restart. This has worked everytime for me. In extreme cases, I think you can also remove the AC fuse and start the car, which will also reset the computer. I also think that by taking the climate control off the "AUTO" setting has worked in the past.

Posted on Oct 27, 2009

wracefans24
  • 1985 Answers

SOURCE: I can not get hot air to come through the vents on

you need to check under dash to make sure plastic heat pipe is in place to that vent

Posted on Dec 04, 2009

  • 946 Answers

SOURCE: I am working on a 2003 Chevy trailblazer, and the

Bob,if this is an automatic(climate control)type system,it could be a computer problem or electronic board problem.
I really wouldn't know where to start,except by phoning GM service manager and lay the problem before him.He may know EXACTLY what it is and tell you right over the phone.Sorry I'm no help here.(:^( don-ohio

Posted on Nov 03, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 2004 chev Express box van and my tail lights wont work every blinker works just not the lights both sides replaced bulbs still nothing


Fuse Usage 1 Climate Control 2 (HVAC) 2 Compass 3 Ignition Switch, Theft Deterrent System Module (PK3) 4 Upfitter Courtesy Lamps 5 Climate Control 1 (HVAC) 6 Empty 7 Instrument Panel Cluster 8 Audio System, Chime 9 Auxiliary Park Lamp 10 Auxiliary Trailer Back-up Lamps 11 Remote Function Actuator, Tire Pressure Monitor (TPM) 12 Climate Control (HVAC) Controls 13 Trailer Park Lamps 14 Front Park Lamps 15 Taillamps, Back-up Lamps 16 Empty 17 Steering Wheel Sensor 18 Outside Rearview Mirror Switch 19 Empty 20 Empty 21 Rear Defogger 22 Outside Rearview Mirror Heater 23 Empty 24 Empty 25 Cargo Door Unlock 26 Rear Door Lock 27 Front Door Lock 28 Rear Passenger Door Unlock 29 Upfitter Park Lamps 30 Front Passenger Door Unlock 31 Driver Door Unlock 32 Airbag System, Automatic Occupant Sensing (AOS) System 33 Right Rear Park Lamp 34 Left Rear Park Lamp 35 Upfitter Auxiliary 2 (J-Case) 36 Upfitter Auxiliary 1 (J-Case) 37 Rear Blower (J-Case) 38 Empty (J-Case) 39 Run (High Current Micro) 40 Park Lamps (High Current Micro) 41 Empty (Mini Micro) 42 Upfitter Auxiliary 2 (High Current ISO Relay) 43 Retained Accessory Power (RAP) (High Current Micro) 44 Rear Defogger (High Current Micro) chevrolet-express-fuse-box-floor-console-fuse-block-247x300-3m55w415sdhfmumhyuzqkab2-3-0.jpg

Jul 27, 2017 | Cars & Trucks

1 Answer

2007 mercedes s550 passenger side tail light wires diagram . The wires were cut and the harness was taken


Right side turn/brake light wire is green. Running light wire is always brown on all four cornets. Left/drivers side turn/brake is always yellow. This is pretty much a universal standard.

Jun 25, 2017 | Mercedes-Benz S-Class Cars & Trucks

1 Answer

2010 F150 Lariat. Dual climate control works only on passenger side. Rear temperature controls work fine. Driver side or left vents only blow hot air. Regardless if AC is turned on or temperature...


If the driver's blend door actuator has failed completely, or the wiring to it is damaged, you will not hear any clicking. Check for appropriate voltage at the blend door actuator, and determine from there if it's the actuator or the control unit.

Dec 20, 2016 | 2010 Ford F-150

1 Answer

2003 Pontiac Montana heat gets hot in front, blows but seems weak, and no heat on rear controls but blows ******* rear. what is going on?


Is your heater blower motor working on all speeds ? Are you get any air coming from the rear vents ?

Feb 25, 2015 | 2003 Pontiac Montana

2 Answers

Heat comes thru driver's side vents, but blows cold air thru passenger side vents


You likely have a faulty blend door. It could be electrically, mechanically related, or even a broken door. It may be the blend door motor, or possibly the temp sensor.

Dec 30, 2012 | 2010 Ford Flex

1 Answer

My ac only blows cold air out the driver side vents. The passenger vents and the rear seat vents just blow air.


There is a "blend" door on some models with automatic climate control and/or dual zone heat and air. If your model has this option, this might be the source of your problem. Possibly the blend door is stuck and can be freed easily if you're lucky. I have heard of some repairs for this problem to be quite costly, so definitely check around and get several diagnoses from reputable sources before jumping into this.

Jun 16, 2010 | 2005 Jeep Grand Cherokee

1 Answer

Hum/noise on driver's side dash


No , there are no vacuum operated mode, temp. actuators ,there are all electric actuators . Is your lacrosse Dual Zone Control ? Could be a stuck temp. control actuator . Do you get both heat an cold from that vent . I'm assuming it's a vent when you say grid . Does you lacrosse have manual or automatic climate control ?
Air Temperature Actuators The air temperature actuator is a 2-wire bi-directional electric motor. Two control circuits enable the actuator to operate. The control circuits use either a 0 or 12-volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 12 volts. In order to move the actuator, the HVAC control module grounds the appropriate control circuit for the commanded direction. The HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction.
The HVAC control module determines the door position by counting motor pulses on one of the control circuits. These pulses are small voltage fluctuations that occur when the brush is shorted across two commutator contacts as the motor rotates. As the actuator shaft rotates, the HVAC control module monitors the voltage drop across an internal resistance to detect the pulses. The HVAC control module converts the pulses to counts with a range of 0-255 counts. The HVAC control module uses a range of 0-255 counts to index the actuator position.
The replacement of Temperature Valve Actuator Replacement - Left Side Is not difficult at all , Don't need to take the whole dash apart !
Remove the left closeout panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side. Disconnect the electrical connector from the left air temperature actuator. Remove the mounting screws from the left air temperature actuator.
Remove the left air temperature actuator.
teiaaaaaelftksuqmcc

This is view of left side actuator .
+p5dflbxumqhfaaaaaelftksuqmcc

Mar 24, 2010 | 2007 Buick LaCrosse CXL Sedan

2 Answers

2004 gmc 1500 heat is only blowing on passenger side. driver side is blowing cold air.


sounds like you have dual zone climate control in your truck. Most likely the actuator that controls the temp door in the HVAC box

Nov 22, 2009 | 2004 GMC Sierra

1 Answer

04 Chevy Tahoe Climate control issues.


HVAC control head problem or it is the air Temp Control Valve problem. THe control head is the one with the buttons and knobs and the control vavle is located on the HVAC carrier assembly underneath dashboard (two of them one on left and one on right in center). This is a job for someone who has knowledge of HVAC and electrical on a GM vehicle.

Jul 17, 2009 | 2004 Chevrolet Tahoe

2 Answers

2003 escalade rear climate control no heat just cold air.


there are two separate actuators for the rear system. one controls temperature and the other controls vents from head to feet. mine problem was the later. that acutuator for esv 2003 is 89018365. it is located just below third seat cup holder passenger side and can be replaced simply by removing cup holder. triangular shaped part with wire harness.

Feb 25, 2009 | 2003 Cadillac Escalade Esv

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

230 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

yadayada
yadayada

Level 3 Expert

76109 Answers

Michael Contreras
Michael Contreras

Level 2 Expert

166 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...