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Garage => Mechanicals => Topic started by: Blue300SD on 09 March 2018, 12:01 PM

Title: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 09 March 2018, 12:01 PM
Hey Guys-

I am copying this thread that I posted on the 380SL forum. I recently owned a 1980 300SD with the ACCII system, and now own a 1981 380SL with the same climate control system. Both had failed Chrysler servos, so I made this replacement kit:

I'm starting a new thread regarding the climate control servo replacement I developed with my coworker/ friend in Stuttgart, Germany.

As you probably know, the first gen climate control system uses an amplifier to control a very complicated servo under the hood. The servo/ amp controls four main functions: letting water into the heater core, controlling the fan speed based on the user inputs, and opening the leg and center vents based on user inputs of hot/ cold/ defrost.

The servo failed in my car, and I thought Unwired Tool's price of $600-800 was ridiculous based on my knowledge of electronics and what parts make up their replacement kit.

Thus, I reached out to my friend in Germany and we developed our own using Mercedes and Chrysler documentation from the when the system was designed.

To install my unit is very simple. You remove the amplifier + servo and install a few bypass wires in the wiring harness (of the amp), a w201 chassis heater valve, and a tube in place of the return line from the servo. It took me about two hours moving slowly :)

My board plugs directly into the wiring harness that went into the servo. The microcontroller then receives the user inputs from the temperature selector wheel and sensors inside the car.

Additionally, my board uses three vacuum solenoid valves to accomplish the same goals of the old servo: 1) Controls Hot Water 2) Controls Leg Vents 3) Controls Center Vents. A circuit made up of four relays directs fan speed.

The vacuum lines from the servo connector plug into the three different solenoids, and one vacuum line plugs into a source (such as the reservoir). Thus, based on user controls, my software on the board tells each solenoid when to open or close, and also directs the relays. This replicates the original function of the cumbersome servo and amp.

I can sell my unit a lot cheaper than the OEM servo or Unwired Tools. Additionally, since it uses modern electronics there is no expensive risk of failure, as associated with the servo.

It will take about two weeks to manufacture for anyone interested. I'll sell the whole kit with the w201 valve, vacuum lines, board, etc for $325 to anyone interested. I also plan to write up a little instruction manual and take some photos of the install on my car. You can PM me if you want to hear more/ get a kit! Thanks a bunch.

-Davis
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Mattr on 09 March 2018, 02:12 PM
I would definitely be interested in seeing photos/a write up. My system is currently working, but I realize that it's a matter of 'when' and not 'if.'
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: karmann_20v on 09 March 2018, 06:53 PM
I would be interested once we get some feedback from people installing and using these. Do you intend to just have a single run and be done with it, or are you going to offer it indefinitely?
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Harv on 09 March 2018, 08:07 PM
This sounds really interesting. My main gripe with my 116 is the heat and AC system is a nightmare.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 10 March 2018, 10:53 PM
Thanks for your input and interest!

I am planning to take photos at the end of this week of the one I installed in my Mercedes 380sl. In the meantime, I've drafted up an "installation manual" of sorts. It isn't complete, as I plan to add photos, but it may help anyone who is curious get a better idea of how it works and where it hooks up. My coworker in Stuttgart and I battled very hard to make it integrate directly with the existing system, and not require any additional sensors/ parts. The manual is attached. I'd love your input on anything in the manual that is unclear/ not helpful!

Responding to Karmann, I am trying to decide right now whether to offer them indefinitely or just temporarily. I think if there's enough interest, I will continue to make them, as the bulk of the work was designing the board not soldering them together :)

Also responding to Karmann, and in general, I understand it's a "new product" so there should be some skepticism. For that reason, I am hashing out a warranty I want to offer. I have no issues standing by the boards, as I really splurged on the internal parts. For example, I am currently using medical-grade solenoids that alone cost $93 dollars per board I sell. What do you guys think about that? What would be an appropriate length warranty?

Please find below a photo of the initial board I was using for testing and the "installation manual."
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: karmann_20v on 11 March 2018, 12:47 AM
Davis, thanks for responding to my questions. Please don't take this the wrong way, but when something is "too good to be true...", you know the rest. For that reason I personally wanted some real world feedback before committing. That being said, if what you say is true, more power to you! I would advise you to continue offering these, especially now that most of the R&D is done. Warranty is not as crucial to me (my W116 is intended to be a second summer cruiser), I am not sure about others but not too many of these see daily driver duty - maybe other members will chime in. Therefore, a reliable and trustworthy system that performs in a similar fashion to the OE unit is key. And going back to my initial statement, confirmation/feedback from 3rd parties using your system is very valuable, at least to me.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Diesel 617 on 11 March 2018, 11:06 AM
Woot woot! This is a project I am deeply interested in. For lack of proper words Fuck Chrysler and their shit servo system. If your telling me I can gut my 300SD of its deadly parasitic Climate Control system all while maintaining the original climate control panel and functionality, where do I sign?

May I suggest a short minuet video showing the system properly functioning? With a thermostat in the car to show the change in temperature.

Would also love to see how the system looks installed in the car (but as you said you are working on adding photos).

Come summer time I want this kit as long as it holds up and checks out.

Also is there an inline fuse installed for the aux. water pump? Would hate to see the board fried due to a faulty pump.

Thank you for letting us know about this development! Please keep us informed as to how it progresses!
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Zaxxon on 11 March 2018, 07:32 PM
I am in the process of getting my A/C working again before summer, and would LOVE to replace that pesky servo by then! The board looks great, and from what I can see in the pics definitely awesome quality! Will you be supplying a housing for the board with it? I was actually thinking about doing something along those lines with an Arduino or other microcontroller myself by then, but to be honest, all the trial and error and such is already done with your project, and it will definitely save some time!

--Zax
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 20 March 2018, 09:14 PM
Good Evening-

Thanks again for your suggestions!

Responding to Zaxxon, I have posted a photo below of the climate control "brain" which is the physical box that will plug in place of the servo for the wiring harness and vacuum controls. I plan to supply my board as shown in the box, along with a heater valve from a W201 chassis, and all necessary hoses, wires, and connectors to make the swap.

Also, Diesel 617, I love your idea about a video with the thermometer to show it working. However, my car is at my vacation home in NC. I just left and was only able to get the video from the engine bay, that I have uploaded to youtube. The link is below. It shows my prototype board opening and closing the car's vacuum lines to control the heater valve, and thus regulate the cabin temperature. The data for opening/closing is based on the temp setting on the pre-existing user panel, combined with information from the cabin and outside temperature sensors.
https://youtu.be/vCFWV3DuDzs

When I get back to NC, I will make a video showing the temperature changing (please standby that won't be until summer time)! Hopefully, we will have promising reviews by then :)

From my design, I am not concerned about the water pump as I would be with the original servo + amp (other than that a failed water pump is not healthy for coolant getting into the heater core). If you review my "instruction manual," you'll find once you remove the servo amp, pins 7-8 are jumped. This provides a fused 12v to pin #4 inside the engine bay on the servo wiring harness which is the power for my board. Unlike the old servo, this is my direct source of 12v, so it will not be affected by a water pump failure. Thank you for your suggestion, and I am open to any more!  :D

I have done extensive testing over the past week on my '81 380SL with the 1st gen Auto Climate Control System, and I am confident in the technology. Now, I am putting together some of the final boards that I will proceed to bench test, once again. From there they will be good to go for anyone interested.
-Davis
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: daantjie on 21 March 2018, 09:50 AM
Whilst I applaud your efforts, I find that the boxed unit appears quite large to fit in the engine bay of larger engined 116's.  For example I would be surprised if you would be able to fit that sized unit into the bay of the 6.9.  The ACC unit is already a snug fit in there.  Just my 2c.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 21 March 2018, 01:45 PM
Daantjie-

I really appreciate your warning there. I picked that housing to prototype my unit in the 380SL, without noting the size constraint differences between the R107 and 380SL. Luckily, the board is much smaller at 3.5" x 5" x 1.75" (including the valves in that height), so for the final shipment a much smaller housing will not be a problem.

This is why I posted to the forums first! You guys are the most knowledgeable and familiar with your specific models. Any other sizing/ installation issues that sound like they might pop up would be great to hear!

Take Care,
Davis
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: daantjie on 21 March 2018, 02:24 PM
Quote from: Blue300SD on 21 March 2018, 01:45 PM
Daantjie-

I really appreciate your warning there. I picked that housing to prototype my unit in the 380SL, without noting the size constraint differences between the R107 and 380SL. Luckily, the board is much smaller at 3.5" x 5" x 1.75" (including the valves in that height), so for the final shipment a much smaller housing will not be a problem.

This is why I posted to the forums first! You guys are the most knowledgeable and familiar with your specific models. Any other sizing/ installation issues that sound like they might pop up would be great to hear!

Take Care,
Davis


Yup here you have come to right place for 116 info (and critique ha-ha).  There is simply no better resource on the planet ;D  Many other boards have 116 sections but this is the place to come to if you want the real deal.

Another mention on the 6.9 is that there is the leveling valve for the front suspension which is bolted onto the front sway bar, which in turn is bolted onto the firewall (US passenger side). It sits fairly deep into the engine compartment so it should not be an issue, but just another thing to consider.  For example if you want to work on the leveling valve on a US spec 6.9 you have to yank the ACC servo unit and all related hoses and auxiliary water pump out before you have ready access to the leveling valve and the hydraulic lines connected to it.

Cheers
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: xaliscomex on 30 March 2018, 12:16 AM
Will be closely following this post.  Own a 1979 300sd w116 and want to get rid of my Servo and amplifier
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 31 March 2018, 06:16 PM
Hey Guys-

I was back at it this weekend doing some final testing. I finished fine tuning the heating/cooling intervals based on the user's input, and I also found a much more compact enclosure for the board that is made of aluminum. It is now smaller in every dimension than the Chrysler piece of junk-- and not to mention lighter for all of you trying to take your w116 to the track  ;) just kidding

Please see the attached photos of the new aluminum case.

I will continue testing the board and running it through the wringer this week. I want to go live with sales by the end of the week. Thanks

-Davis
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: 1960mog on 04 April 2018, 10:25 AM
Your ACC fix sounds very interesting.
If you are familiar with this older systems could you please describe what other components feed into your box and how to test them before installing your upgrade.
Things like temp wheel, temp sensor and vacuum pods.
Would your system work in a W123?
Would it be possible to mount the box inside the passenger compartment?
It would be more protected there, especially from the exhaust heat.

Thanks
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 06 April 2018, 06:05 PM
Re: 1960mog-
Thanks for your interest in the project! The kit is compatible with some w123's that shipped with the 1st generation automatic climate control system. Just make sure your control panel looks like the one pictured and it will work (note the vertically stacked buttons).

My board receives three electronic inputs from the car: The sensor chain resistance, 12v ignition power, and a signal from defrost. Additionally, it receives a direct vacuum input line to control the heater valve, and then another vacuum source to control the vents inside the car (foot vents/ center vents).

Before you install the board, you need to make sure the vacuum on your car is pretty good (no worries if it's not perfect, it should still work okay). In the gasoline models, look at the economy gauge at idle. It should be far to the left if your vacuum is good. Aside from that, if you take a vacuum gauge to one of the lines running from the passenger side to the driver's side, you should be able to measure vacuum then do a leak down test.

One vacuum pod (#14 on r107, #19 on w116) controls whether the blower motor can come on or not. It is located behind the glovebox. If it leaks your blower motor will act like it's not working. Test this by trying to cut the blower motor on using the auto low/ hi functions. If it comes on, you're good to go. If it doesn't work but comes on when you hit DEF, then this vacuum pod is either leaking or not getting vacuum. The wires flowing into the pod can be bypassed and replaced with a toggle switch if your vacuum system is plagued with leaks (at your own risk).

The one other variable is the sensor chain. It is made up of a thumbwheel selector, ambient temperature sensor, and cabin temperature sensor. The goal of the climate control unit is to balance the selected temperature sensor with the cabin sensor. It is rare that these sensors fail, but more likely that they are out of calibration. However, my software was designed with that in mind. These are old cars, and thus their sensors are not accurate as new cars, so we created a greater margin of error that leans towards giving you hotter heat in the winter and cooler a/c in the summer :)
Thank you

P.S. Please let me know if I can offer you more assistance personally. I'd be happy to email with you/ talk over the phone to discuss specifics.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: alabbasi on 06 April 2018, 06:39 PM
Nice effort. It looks like an old hard drive enclosure would would make a perfect housing and you'll get a small cooling fan to boot.

Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: daantjie on 09 April 2018, 05:47 PM
I see these on ebay now, happy selling ;D
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 09 April 2018, 06:13 PM
Daantjie + All-

Thank you for your support + advice during the development. With all your help, I was able to make very important revisions to the kit.

I have listed the unit for sale on eBay and on my website that I just set up, www.mercedesfix.com/products/climatecontrol. I've got a good number in stock that have tested out and are ready to ship. More are on the way!

To anyone who wants to order- I made a discount code as a thank you for all your help: W116FORUM. You can order on eBay or my website; the promo code only works on my website. Sorry if I sound like a salesperson!

I made a policy of 35-day returns for any reason and a 90-day replacement warranty. If anyone purchases it and needs repair advice/ climate control advice, don't hesitate to PM and I will give you my personal cell so we can discuss it over the phone.

I couldn't have done it without you guys! Not sure if this will wind up being profitable, but I sure enjoyed the development process :) Any future ideas for replacement kits are welcomed.

Take Care,
Davis

P.S. Becuase of the crazy weather here in NC, one day I would be using full heat, and then full a/c on another! I got to test it across the board.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Zaxxon on 09 April 2018, 06:57 PM
Now I am even more excited to take the W116 out of winter hibernation and start working on the A/C manifold/line. Because once that's fixed, I'll get one of these and hopefully have a functioning system this summer! Props and high 5's to you for coming up with a great product! Can't wait to hear some success stories!

--Zax
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Harv on 09 April 2018, 07:49 PM
Everything looks great Davis.

Have you thought about making a video on an install? Obviously not two hours long, but just highlighting the main steps. Just throw it on Youtube. It's free marketing if someone runs across the video while searching 116/123/107 stuff then you can direct them to your website to buy.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 09 April 2018, 07:50 PM
Harv-
That sounds like a good idea. I will try to pull the time together in one of the coming weekends to make that happen. Greatly appreciated!
-Davis
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: avantbenz on 30 April 2018, 06:42 PM
Your box looks great! How does it differ from other solutions available (if they still even are, that is) - like George Murphy's or Kent B from Mercedes Source?

I'm running a 1980 300SD and am definitely interested!
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: xaliscomex on 09 June 2018, 04:27 PM
Has anyone here on the forum purchased and installed one of these ACCII Climate Control replacement units?

A video showing the installation and how it works would really help in persuading people to buy it.

Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: thegreg92 on 14 June 2018, 03:32 PM
I ordered one last week and received it yesterday. It's not installed quite yet as I am in the process of overhauling/upgrading the entire climate control system. I'll post when its installed and how I made out
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Harv on 14 June 2018, 06:08 PM
Quote from: thegreg92 on 14 June 2018, 03:32 PM
I ordered one last week and received it yesterday. It's not installed quite yet as I am in the process of overhauling/upgrading the entire climate control system. I'll post when its installed and how I made out

Do you think you can tackle it?
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: xaliscomex on 22 June 2018, 08:59 AM
What was the total price after using discount code and after shipping?

I need to make a decision on wether to go back to a rebuilt aluminum body Servo or move on to an alternative climate control system.

Questions to seller;

What happens if the climate control unit fails after a year of installing and using it?

Just wondering if you have some sort of idea on what you will be charging to repair your unit?
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: daantjie on 22 June 2018, 09:57 AM
Guys I don't want to be rude, but I think for this price this unit represents a fat bargain.  I get that we all want to pinch the pennies, but really the questions and grilling on this unit might have driven the developer away.  I mean do you really expect the seller to support this part into perpetuity?  If my ACC goes tits up I will for sure seek out this kind of setup.  Even if it does not work after a few years, it is still better than than you had with an inop ACC unit, no?  Granted, I live in a fairly mild climate, thus a perfectly working HVAC unit is not high on my list so I get why some of you are quite anal about this, I just think that it might be time to calibrate your expectations a bit here.
Friday rant over 8)
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: raueda1 on 22 June 2018, 11:03 AM
Quote from: daantjie on 22 June 2018, 09:57 AM
Guys I don't want to be rude, but I think for this price this unit represents a fat bargain.  I get that we all want to pinch the pennies, but really the questions and grilling on this unit might have driven the developer away.  I mean do you really expect the seller to support this part into perpetuity?  If my ACC goes tits up I will for sure seek out this kind of setup.  Even if it does not work after a few years, it is still better than than you had with an inop ACC unit, no?  Granted, I live in a fairly mild climate, thus a perfectly working HVAC unit is not high on my list so I get why some of you are quite anal about this, I just think that it might be time to calibrate your expectations a bit here.
Friday rant over 8)
I was thinking the exact same thing.  Well said.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Squiggle Dog on 22 June 2018, 01:06 PM
Yeah, it's a fact of life that the ACCII system on the W116 is going to cause problems and repairs can be tedious. I think this setup is the way to go. Good for the seller for coming up with this design which greatly simplifies the system and makes it more reliable. Of course, I'd recommend converting to manual climate control, but that is such a huge undertaking in itself that it's not realistic for the average owner. If I were to have kept my ACCII, this is the way I would have gone. It seems the worst that could happen is the circuit board fries. In that case, it should be able to have the bad components replaced. Even then, I suspect it would last much longer than even an aluminum bodied servo.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: raueda1 on 22 June 2018, 03:33 PM
Quote from: Squiggle Dog on 22 June 2018, 01:06 PM
Yeah, it's a fact of life that the ACCII system on the W116 is going to cause problems and repairs can be tedious. I think this setup is the way to go. Good for the seller for coming up with this design which greatly simplifies the system and makes it more reliable. Of course, I'd recommend converting to manual climate control, but that is such a huge undertaking in itself that it's not realistic for the average owner. If I were to have kept my ACCII, this is the way I would have gone. It seems the worst that could happen is the circuit board fries. In that case, it should be able to have the bad components replaced. Even then, I suspect it would last much longer than even an aluminum bodied servo.
And to be clear - it seems that the "average owner," if this board is representative of anything, tends to be a pretty hard core enthusiast.   
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Blue300SD on 27 June 2018, 04:40 PM
Quote from: daantjie on 22 June 2018, 09:57 AM
Guys I don't want to be rude, but I think for this price this unit represents a fat bargain.  I get that we all want to pinch the pennies, but really the questions and grilling on this unit might have driven the developer away.  I mean do you really expect the seller to support this part into perpetuity?  If my ACC goes tits up I will for sure seek out this kind of setup.  Even if it does not work after a few years, it is still better than than you had with an inop ACC unit, no?  Granted, I live in a fairly mild climate, thus a perfectly working HVAC unit is not high on my list so I get why some of you are quite anal about this, I just think that it might be time to calibrate your expectations a bit here.
Friday rant over 8)

Daantjie, I appreciate your consideration of both sides.

I didn't realize this forum post was still moving along (so I haven't been active in a while on this site), and I want to make clear that I am here for any help/ support in the future.

I have sold a significant number of units now to many different places across the US, Canada, and some countries in Europe--which was only possible with the help, questions, and tough advice from you guys. So far, every customer has gotten their unit up and running in their car. A handful of customers had initial difficulty in getting the unit installed, but with my guidance, they were able to overcome that and all the units shipped are currently functional.

Responding to xaliscomex, each unit contains three solenoid valves to direct the vacuum that are very expensive and tough to manufacture because they are medical-grade and designed to last for hundreds of millions of cycles. These solenoids are the biggest expense in a given unit, but also the most reliable part. Thus, if you were to face some failure 1, 5, or even 7 years out, it would be likely that these solenoids could be reused, which would result in a relatively low cost of repair.

As always, I really appreciate any questions + comments you guys have on the kit! Feel free to reach out to me personally as well if you need anything.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: Diesel 617 on 03 November 2018, 09:04 AM
Just ordered a kit, excited for it to arrive! Hopefully it breaks 40 next week.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: ACC2 on 27 January 2020, 12:23 PM
Quote from: Diesel 617 on 03 November 2018, 09:04 AM
Just ordered a kit, excited for it to arrive! Hopefully it breaks 40 next week.

May I ask how well it works? I'm thinking to order this one myself.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: ACC2 on 27 July 2020, 09:03 PM
I have been running this setup for 6 months. I have to say it%u2019s not perfect, but it%u2019s better than a non functional system.

My friend also ordered a unit for his car and it%u2019s ok. I wouldn%u2019t say the ACC2 system was great to begin with and also my car may have another issue compounding some struggles as well.

I made an installation video if anybody wishes to see:

https://youtu.be/uXqRBWebOHk



Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: xaliscomex on 09 August 2020, 09:36 AM
Appreciate the time you took to film the video. 

Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: TruditheBenz on 09 December 2020, 01:44 PM
I just checked the Hamilton Motor Company site that was linked and it looks like they're out of stock.  Is there a plan to make more?  Are either of the two shown on eBay for $669 the same as the one discussed here.  I'd really like to go with this one - the combination of an install manual and video have convinced me that I might succeed on my own. ?
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: john erbe on 11 December 2020, 09:00 PM
Years ago I put in the UnwiredTools unit. Works great.
Title: Re: 1st Gen Mercedes ACCII Climate Control Servo: Less Expensive Replacement Option
Post by: karmann_20v on 12 December 2020, 01:18 AM
Quote from: TruditheBenz on 09 December 2020, 01:44 PM
I just checked the Hamilton Motor Company site that was linked and it looks like they're out of stock.  Is there a plan to make more?  Are either of the two shown on eBay for $669 the same as the one discussed here.  I'd really like to go with this one - the combination of an install manual and video have convinced me that I might succeed on my own. ?

Why don't you use the contact form on the website and ask them if they will re-stock soon (or at all)? If not, the UnwiredTools is still available from various sources.