bbrain

I read through this with my mechanic for my c240.. and it was just the linkages themselves.. my new mechanic for my w209 thinks it is also the stepper motor itself.

Is there a way to test in case it is not only broken linkages but also a bad motor, and also can the motor go bad from broken linkages? just a few questions before i go buy the motor/actuator iteslf

thanks for any help
brian

mleskovar

Not that I'm aware of but depending on/if the noise it makes you can tell the difference. A 'ticking' noise is the motor shaft slipping inside a broken actuator and a louder 'snapping' noise is the motor clutch slipping. Sometimes they tick before the shaft falls off and then the noise stops. Replace all the actuators you can access when it comes apart just to be safe.

They shouldn't but anything is possible.

bbrain

thanks. ordered a new motor from autohausaz =)

abnmike77

I have a 05 c 230 Kompressor. I know the engine is a m271. I know that the engine is basically the same from 03 to 07, but I can't find anywhere that my car is part of a specific recall. SB 03.30/08i dated 23 April 2008. Can anybody help. I got the repair bill for 8400 dollars and I aint got that kind of dough laying around. the sprockets on the cam shaft adjuster are broke and other models have a recal but I don't believe my vehicle falls under that recall.

samaritrey

Are you in the US if so the m271 was not sold after 2005 when the c230 model came with a v6. I have also never heard of a recall on the M271. I think the service bulletin was only for M272 and M273 engines.

y2k2c200

Thanks for the great wite-up Racin Fool!

Step 7: I can't remove the covers of the rear ac unit to get to the 2 10mm screws. I don't want to force anything and possibly break it, so at the minute I'm stuck and will probably have to abandon and reassemble till something can shed some light PLEASE!





(I suspect the two little slots have something to do with it but not sure.)

ferdiyan

Finally had the time do this.

Using the instruction found in the earlier post, I diassembled everything and had to figure out some things not mentioned in the post (our country is driving on wrong side of the road - Right Hand Drive / RHD) and the instruction was for LHD

Anyhow, long story short, I got to the M2/15 (footwell stepper motor) and replaced the link. And being a RHD, I don't have the annoying vertical bar blocking my way, it's an easy Repair and Replace (sorry guys).



However, the snapping still exists . and apparently coming from one of the gears on stepper motor M2/21, and the driven gear (the gear connected directly to the motor was cracked at the center (F**ck !).



Problems are: 1) I need to buy a bag of these small tid bits costing almost U$80 and using only a piece of it 2) None of the shops here has it in stock. It needs to be ordered from Germany ... they say it is a rare case for this to happen



I tried to repair it using epoxy and strengthening it by wrapping a thin wire around the outer plastic shaft but the twisting action from the stepper motor is too strong and it just snaps out of it. I also tried to swap with other stepper motor in case the motor is faulty, it is still the same - so stepper motor is ok.

Feeling hopeless, I observed how the stepper motor works every time I turned on the car and and tried it in resync mode. It seems like there is a point when the M2/21 motor moves, Cool air is blown but since the motor snapped at the end, it just remained at the last position. At this point I can get lucky: cool air is blown from both left and right air ducts or half cold and half hot.
My 'educated' guess is probably when the motor snapped, it stops after few tries (I heard 3 snaps before it stops) and left with 'improper' flap position.

So, resync again and by the time it blows cool air, I unplugged / disconnected the power cable to the M2/21 motor. So the flaps will remain 'to blow' cool air (I live in the tropics, so I don't give a damn about heater), hence M2/21 is disabled on purpose.

And now cool air is blown and no more sweating .

Question is, what does the M2/21 do? The description for the M2/21 is the "Fresh air flap postionining motor", what's the difference with M2/15?

Regards,

Ferdiyan

y2k2c200

Sometimes it helps stepping away from it all and taking a breather. LOL.

Simple really - flat blade screwdriver into the two slots marked here:



Take the cover off, take the blower motor unit out (T20 Torx), then loosen the 2 remaining bolts on the center console.

Hope this helps somebody else out.

Wilsophia

I have a write up about this, have time to see

about the rear AC, start seeing from #5

https://mbworld.org/forums/c32-amg-c...ils-steps.html

abnmike77

Concerning the M271, I have the M271.948. If you bring it to the dealership for a rattle noise upon starting, until the oil pressure builds up, they are supposed to replace the cam shaft adjusters, both the intake and exhaust. I have a 8500 dollar bill at the dealership in Wichita falls, tx and they are putting a remanufactured engine in my 05 c 230 Kompressor. I had to do a lot of studying, but I finally found that the M273, and the M273 engines where have a lot of cam shaft problems and there is a lawsuit against mercedes. I looked into it more and that is where I found the start bulletin, about the rattling noises. I am out 2500 Dollars, but it is not 8500 Dollars and I get a fresh start, at 136000. I love my car. It has personality and charisma. I am extremely happy that Mercedes Made this better for me. I would have never gone back. If you need any info on the other stuff, I have access to lots of manuals and tech bulletins, HMU.

samaritrey

If you would like to continue to talk about this please start a new thread or post in an existing one about this type of issue.

y2k2c200

Anybody know how to get to A32m2? It's situated in/behind the charcoal filter/blower unit which is behind/below the glovebox in my RHD. I've stripped everything to the point where I have access to the charcoal filter/blower but I can't get to the stepper motor.

King Z

Couldn't you use a small clamp to wrap it around the shaft?

ferdiyan

Nope, the collar was too big to fit the shaft and it will interfere with the movement when joined with the stepper motor.

mleskovar

I'm not familiar with RHD but I assume it's a mirror image (or close) of my LHD. I have a similar problem but it's for the passenger defrost vent (m9). The only way to get to it is to remove the upper dash. I was able to get to the ribbon cable connector at the motor and pull it to stop the noise. You may be able to prop open/closed the flap permanently if you don't feel up to taking off the dash top. Someone posted how to remove the dash top in this forum.

y2k2c200

I don't think I'll go as far as stripping out the top dash. The problem with these things is that there's usually a plastic clip that breaks off, or a screw that strips out, or a scratch put on somewhere...

I was wondering whether it's possible to de-activate said stepper motor altogether by means of the diagnostics software?

Wardsweb

I finally bit the bullet and spent the afternoon tearing into my dash, fixing the floor/face actuator and while I was at it wired my Sirius power in the dash instead of using the cigarette lighter.

By the way, the pictorial early in this thread missed a few things. Like the upper air vent removal has two upper clips (left and right) and two lower screws. Also the ash tray assembly has two clips on the bottom to remove it, instead of putting tape on the lid to remove the screws behind it. The worse hassle for me was the kick panel under the steering wheel where it joins the console. That was a PITA. All in all it was worth the effort.

Shar43ber

my coupe just barely 30K....

Tcrawman

Yep just took mine apart and found the same thing hopefully the dealer or somewhere has some tomorrow. I think 3 motors have this gear. Going to replace them all while I'm in there.

ferdiyan

The painful part is that you need to buy a bag of gears and levers (they are selling it in 1 plastic bag) , part $60-$70 for the bunch and only use 1 (one) gear.

Tcrawman

Got it all done yay!!!! Took about an hour to get it all back together. So if anyone needs the bag of gears/ levers it's yours for $50 plus shipping. Has all the parts. Part number is
2038300032

hallfleming

This thread is great for my dads 2001 C320. So far I've replaced one blend motor, two lever arms and now one gear that comes in the $100 bag of parts. Can someone help me with the initial setting of the gears for the blend motors behind the radio? One was broken so I don't know how to set the position of the gear on the blend motor to sync with the gear built into the exchanger box.

Thanks in advance!

mleskovar

I don't think it makes any difference as long as they mesh. The 'synch' takes care of the positions for all the flaps/motors.

hallfleming

I think I got it on correctly. Theres 'dips' in the exchanger that lines up with a tab on the gear i replaced. All is well but in sync mode, it doesn't stop and I hear a faint click in the top of the dash. Time to check another blend...

mleskovar

A "tick" is usually a cracked actuator. A loud "snap" is the motor. I hope your noise isn't the passenger defrost flap......requires removal of upper dash to replace. You can get to the connector on the motor to deactivate it though with a looong screwdriver. Ask me how I know