I know a lot of us have upgraded the automatic air conditioning to the convenience automatic air conditioning, which a lot of people call the climatronic upgrade. Of course, there are still a lot of things missing from our cars, like about four flap motors and the charcoal filter. Also missing is the mutlifunction sensor and sun sensor. The multifunction sensor monitors a lot of things like humidity and air quality. It can trip the air conditioning into recirculate mode if there is too much smog in the air. The sun sensor is soley used for determining which side of the vehicle the sun is shining on, in order to more accurately control the temperature.

By studying the wiring diagrams, I found that it wouldn't be too hard to retrofit the multifunction sensor and sun sensor to my car. Below are the pictures.

By using the really cool MB wiring harness repair (or for my purposes 'creation") kit, I was able to use the correct plug connections and terminal ends to make a really clean install. The only thing not "factory" is the colors of the wires themselves. I can dig them out again and take some pics if anyone is interested.

In the first picture you can see the hood grille, and the old plug used to fill the hole where the sun sensor goes.

The next picture is of the multifuntion sensor mounted on the plastic trim under the windshield, and the last is with the car reassembled you can just barely see the corner of the sensor poking out.

I know that the multifunction sensor will work as it should, however without all of the flap motors, I'm not entirely sure that the sun sensor will have a real effect.

Great MOD
Could you tell how much for all parts and parts needed? :p
Thanks

yeah, more info pls...

as usual, im interested too!

great !!!
something else to add to my "never-ending" list...........



Carlos

Saprissa@aol.com

how about the motors and charcoal filter?
can they be ever retrofitted?

Soon you will have all extras provided or not by MB or MBenzNL

that is the ultimate goal !
and then when I finish... i'll buy an AMG CLS85 as my fun car,
and some classic MB's as project cars: 1970's SL, 1960's Fintail, 1950's 170, & 1940's Ponton.

i love the Pagoda's. they are my favorite SL, behind the Gullwing and 190SL of course.

sorry to hijack the thread Mike,
but back on topic....

I was under the impression that my C320 Coupé came with Charcoal Filter & Sun Sensor ? is that not the case ? Before I swapped to Digi-Convenience-Climatronic, my analog unit had a "charcoal filter" button. The new digital unit has one too.
And that little black dome thing on the plastic hood grill, is that just a plug ? When I asked my SA a year & half ago, what that was, he said it was the sun sensor.

So how do I know if I have these items for sure ? Where are the 4 flap motors located ?
Does the multi-function sensor install require some sort of programming ?

Carlos

Saprissa@aol.com

also the C320's have dual blowers in the cabin. when the C240's and coupes only have a single blower?

by C320's do you mean: C320 Sedans & C320 Coupes ?

by coupes do you mean: C230K coupes and C320 coupes ?

well, i was under the impression all coupes, 230/320, had single blowers. this is what i was told by my tech.

so take it for what its worth. some techs answer questions they dont know the answer to by pulling answers out of their @$$, some answer questions they dont know, by simpley saying, "i dont know"
you never know.

First of all, I think that each MB vehicle only has one blower. They are pretty big, and I don't think that there is room for a second. Unless you get the rear air version. Yeah, that jogs my memory - I think that there was a possibility of a blower in the center console, that would help out with the rear seating area. I do know that the coupes don't have that. (OK, Amdeutsch, USA coupes that is)

Carlos, are you sure that the old control unit had a charcoal filter button on it? It had a recirc button, but from my memory that's it. There were only two versions of climate control on the 203's - the high line and the low line. I don't think that the low line ever had the charcoal filter. If you have the old one, that would clear it up for sure.

An easy way to tell if you have the multifunction sensor and sun sensor (they only come together, so if you have one you get both) is to look and see if the corner of the mutlifunction sensor is there. Another dead positive way to see if you have the sun sensor is to look down at the black dome in the grille on your hood. You should see a plug connection and wire going to that area. If you don't, it's not there.

As for the flap motors, you would have to get the entire HVAC unit. It's completley different, more ducts and all of that. But, I'm thinking that it's not worth it. It would cost a lot more money, and be a huge amount of work. But, I don't want to judge what someone would be willing to do, now do I? But seriously, the cost would be prohibitive, in my opinion.

As far as parts list and other things, I'll have to get them. Once again sloppy record keeping is causing me more work, I should have written it all down before hand! I'll post it before too long.

well, most projects start out cost prohibitive, but the end result is all that matters!

most of my mods are cost prohibitive!

You are so right!!

OK, here is the list of parts that I used for my car. I have included suggested list price - yours may vary.

A203 440 98 06 1 ea Cable Harness ($27)

A211 870 01 10 1 ea Sun Sensor ($43)

A211 830 04 72 1 ea Multifunction Sensor ($222)

N000000 003242 1 ea Screw

A008 545 55 26 4 ea Female MQS Pin ($1.20 ea)

A013 545 15 26 3 ea Female SLK Pin ($1.20 ea)

A035 545 73 28 5 ea Male SLK Pin ($1.40 ea)

A000 545 69 80 3 ea Seal (for MQS pins $1.20 ea)

A220 540 06 81 1 ea Plug Housing for Multifunction Sensor ($2.00)

A037 545 13 28 1 ea 2 pin SLK Male Connector ($2.00)

A220 545 54 28 1 ea 2 pin SLK Female Connector ($2.00)

One last thing I don't have a part number for is a ground loop. You will need one, but it can come from anywhere.


I'm pretty sure that it everything. Now, all I have to do is figure out how to get the wiring diagram up so you can make sense out of it!

Now, before anyone starts spending money and blaming me for any problems, you better know what you are getting into before you get started! This worked for me, but my car is an 04 C 320 coupe - if you have a different car this may work but I don't know for sure. Check it out first! I'll be happy to help anyone, but I don't want to get thrown under the bus for this.

Mike

Here is the wiring diagram. Now to make sense of it:

N22/7 is the Climatronic Control Unit

A1 is the instrument cluster

N10/1 is the front SAM

B31 is the Multifunction Sensor

B32/2 is the Sun Sensor

W16/4 is the ground point

X28/26 is the connector at the end of the sun sensor connector

X35/9 is a connector that you will add yourself

Quick function description: The multifunction sensor and sun sensor each get a power lead, and a ground. They each also share a data line which goes to the climate control unit. The power comes from the same pin in the front SAM that the power for the instrument cluster comes from.

That's the basic theory. I had to construct the harness from the multifunction myself. The parts list gives you all of the goods necessary for this, except wire. (I was fortunate enough to get a bunch of wires from a 211 cabin harness, so a lot of the work was done for me, but I still had to put it into the correct order)

When I get some more time, I'll take a few more relevant pics that should make the story a little bit more clear.

ah, finally someone that is willing to do things I would have done.

Coming from you, Sunman that's a compliment!

So, after seeing the parts list and prices, no one is interested? What about all that talk about money or effort not being the point?

I can post some more info, but I need a little more encouragement to go digging thourhg stuff again to post it.

dude, im interested. whats the exact function ill gain from this?

Two things:

The multifunction sensor determines the humidity, and pollutants in the air. Although we had a humidity sensor in our cars already, since it's not the one that the upgraded control unit is looking for, it may not read it at all. So, there is that possibility that with out it, the control unit has no idea of what the humidity is.

The sun sensor looks at where the sun is shining to take into account the heat that will cause on a certain part of the car, thus making the automatic feature more accurate. One addedum: Without the full convenience climate control HVAC housing, I don't know if this will have very much of an effect. That part is TBD.

In a lot of ways, it was an accomplishment just to get it done, on the car and working.

cool. im really interested in this as well.

oh, i'm totally interested....
as you very well know i am a OEM MB mod junkie, so if it's made for the Coupe, and mine doesn't have it, i want it !

so far we're talking approx ~$300 + labor
so that's not bad at all. HVAC housing would be a B!tch to do however,
and i'm still trying to figure out if C320 Coupés came with any of this stuff to begin with, or was it just the C320 sedans.

Carlos

Saprissa@aol.com