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2010 SLK55 AMG
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Discussion Starter · #1 ·
Soooo.. Got that done, 2 hours from start to finish..

Although... Do I need to "heat up" the engine or something for this to work? It's not blowing ice cold air. "Somewhat" cold, but not ice cold. Does it take "a while" before it starts blowing ice cold air??

The A/C wasn't working that well even before though. I've cleared all error codes and had it pressure tested. All fine, no new error codes after the reset either. System said 6 bar (6.5? More than six anyway), so that should be fine..

PS. for those of you who're anal about these things, yes I know it's the wrong one - I should have gotten one with black buttons. But those seems impossible to find.. For a decent price. This is barely noticeable and I think I like the silver ones better anyway..

PS. I did get and fit the pollution sensor and the sun sensor (which was a pain to do!).
598676
598677
 

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Discussion Starter · #3 ·
Yes, I did. But that's the thing, it's supposed to BE just a straight swap!
 

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Have not yet found what I am looking for, but this post eludes to it.

I was reading another thread on this subject, and Dan was saying that the automatic climate control was more than just the module. There are wires and sensors that go along with it. It works without them, but it would make sense to me that there would be some sensors to measure and maintain temperature.

So, question, when retrofitting the automatic climate control onto a car that didn't have it, will the lack of sensors and extra parts be a problem? I've seen several posts saying the module works.

My understanding on the module is that it will vary the operation of the AC to maintain the desired temperature. Does this mean that the module itself has at least one sensor inside it that measures temperature? Because if it doesn't, then I am thinking installing this module is a complete waste of time....

(You 'liked' that post btw)
 

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Sorry but so much written on the topic that I am struggling to find the post/thread I am thinking of,


This is the search that I was working on, but time is limited at present.
You will need to read the threads fully to find what I refer to as it is in a reply to a thread.
 

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I don't know if this was discussed earlier, but Digital Climate Control Retrofit it is not only Control Unit, Sun Sensor and Pollution/humidity sensor.
Please take a look at enclosed photos - also center nozzle housing is different.
code 580 - Manual AC
code 581 - Digital AC
 

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Discussion Starter · #8 ·
Well, what’s been said in numerous threads is that JUST swapping the contoller is enough to get it to cool.

HOWEVER, by adding the two sensors (pollution and sun), you get ADDITIONAL functionality. Which I’ve done…

To get the FULL auto functionality you need to rip out the dash and change that .. ”box” in the center AND add those motors.

But none of that (sensors, ”box” or motors) are a requirement.. As far as I’ve understood it anyway.
 

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2008 SLK280
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If the a/c was not very cold before just changing the control unit will not make it any cooler. it is the compressor and evaporator etc that does the cooling.
 

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Discussion Starter · #10 ·
Yeah, I know. But it's WORSE now.. When I start up the cold engine, the new control unit is spewing burning hot lava at me! For quite a while. It does cool down, ever so slightly, after 10-15 minutes, but it never gets as cold as the old unit. Which DID got cold, but not ice cold..
 

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Did you source the unit by part number?
I am just wondering if it is from an older unit where ac lit is actually off.
MB later changed that to lit meaning on.
 

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Discussion Starter · #12 ·
It's the "A171 830 16 85" one, which should be the correct one. Well, close to correct anyway.
 

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Depends how diligent you are.
Never done before and making sure new electrics are good before refitting.
2 hours sounds sensible to me.

Last thing I'd want to do is break clips, or lose screws.
 

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I would imagine installing the sun sensor added the majority of the time to the job. Just getting that upper vent/speaker grille combo thing in is a real bear until you figure out how it goes into place.

OP when you stated you cleared the codes can you elaborate? Are you using DAS to reset the trouble codes for the AC climate module? (not the ECU/obd-II module) If the system goes low on freon it will lock out the compressor until it is reset regardless of current freon levels. Trouble codes in this module will not turn any lights on the dash on you have to scan the AC module itself to even know they are there. Sounds like that may be your problem. Other than that check your recirculation flap is working how it should and you are not just piping in air from outside at all times. You can find it under the battery cover in the engine bay. When the car is parked and AC turned on, the electric cooling fan for the radiator will kick on. If it's not check that out too.

Lastly I don't really buy that the digital is a straight swap and the blower housing etc are optional. That's not really how german car makers like to do things. In my digital equipped 350 you can hear servo motors moving about in the dash depending on the settings you select. Those servos and sensors aren't just in there to make star wars noises here and there for my entertainment, they are part of a system that only works correctly if complete. I don't doubt it's basic function is there but without the ability to close flaps and direct air as intended I cannot fathom how it would work correctly. Good luck with it.
 

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Discussion Starter · #17 ·
I would imagine installing the sun sensor added the majority of the time to the job. Just getting that upper vent/speaker grille combo thing in is a real bear until you figure out how it goes into place.
Oh, yes! That was a massive pain in the behind! Had to remove EVERYTHING I could, and it was still super-tight!
That one was probably 60% of the time :). It was MASSIVELY difficult to get to! And then finding the cable.. Which ended up right in front of my eyes, but I didn't expect it to be EASY to find, so I looked everywhere else first :D :D.

OP when you stated you cleared the codes can you elaborate? Are you using DAS to reset the trouble codes for the AC climate module? (not the ECU/obd-II module) If the system goes low on freon it will lock out the compressor until it is reset regardless of current freon levels. Trouble codes in this module will not turn any lights on the dash on you have to scan the AC module itself to even know they are there. Sounds like that may be your problem. Other than that check your recirculation flap is working how it should and you are not just piping in air from outside at all times. You can find it under the battery cover in the engine bay. When the car is parked and AC turned on, the electric cooling fan for the radiator will kick on. If it's not check that out too.
I had it read by a MB service center in Glouchester (they where supposed to reset all codes, but never did) and then @i860 did it when we (he) added the (A)gility mode for the gearbox.

NONE of them found any problems with the A/C. A very old code about low refrigerant, but that never came back after the reset. And it say 6.0bar, so that's ok as well.

However, I just had it checked with a MB specialist (this time) in Bristol and everything is fine! No fault codes, no problems that he could see. What i DID say was that: "there's SOMETHING fishy about the compressor, power's going to it, but it's obviously isn't working". So he would have to do a closer inspection, but he couldn't do that because the engine was hot ("glowing hot, it would take to Christmas for it to cool down" as he said :) ). So I've booked a new visit, where I can leave it with them a day or two so that they can go through everything from the ground up.

However, in retrospect, it didn't work before the retrofit either. Thought it did, but it was just the cold outside air blowing inside..

Lastly I don't really buy that the digital is a straight swap and the blower housing etc are optional. That's not really how german car makers like to do things. In my digital equipped 350 you can hear servo motors moving about in the dash depending on the settings you select. Those servos and sensors aren't just in there to make star wars noises here and there for my entertainment, they are part of a system that only works correctly if complete. I don't doubt it's basic function is there but without the ability to close flaps and direct air as intended I cannot fathom how it would work correctly. Good luck with it.
"Work correctly" is a loose term. I will fix those as well this winter, when I can rip out the whole dash, but for now this should get me close - I still have to do some manual things, but it should be much "smarter" than before..
 

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Discussion Starter · #18 ·
Been watching YouTube videos and try to figure if there's ANYTHING I can do myself. My appointment with the guys in Bristol isn't until mid July and I have 2.5k mile journey ahead of me in two weeks and it would be nice to have it fixed before that :).

Watching this video, it does feel like my clutch is seized shut. I can't move it at all! Can this be replaced separately? I'd prefer not to have to replace the whole compressor as that involves emptying the system etc etc..
 

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2005 SLK55 AMG
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Mine was a straight swap and it works fine. Only thing I added recently was the pollution sensor.
 

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Discussion Starter · #20 ·
A/C running

About half way in, I turn on the air con. Nothing changed. Isn't the inner part supposed to NOT run when the A/C is off?
 
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