1980D complete servo removal then bypass? bypass? - Page 2 - PeachParts Mercedes-Benz Forum

Whiskeydan · #16 07-22-2008, 09:13 PM

Quote:

Originally Posted by ForcedInduction

Performance Products has a Digital AC Servo Upgrade Kit for $600.
http://www.performanceproducts4benz.com/productpage.aspx?pid=109850&cid=3&sid=383

[IMG]http://content.************************/main/109850/NO.jpg[/IMG]

Is this still available?

I think I could come up with a simpler, cheaper solution if there's enough interest.

charmalu · #17 07-24-2008, 12:48 AM

Unwired tools has the same type up grade. I think it use to be listed for
$700.00 and could buy it direct from them. now they don`t sell to the
general public.

www.unwiredtools.com click on the buy tab, then click on ssautoparts.

then click on ACC II installation manual. seems easy enough to DIY.

looks similar to the performance products picture.

charlie

#18 07-24-2008, 03:19 PM

http://unwiredtools.com/accii.asp

Yes, it looks almost identical.

280EZRider · #19 07-24-2008, 03:37 PM

Quote:

Originally Posted by spleen

Upon further reading of a very good, detailed post on how to bypass the servo, I am left wondering why just bypass it, why not completely remove the servo and the quagmire of potentially leaking vacuum lines along with it and simply have a conventional cable operated heater control valve on the firewall. Has anybody tried this? It looks like somehow, a person could leave the vaccum system in place in the dash for opening and closing ducts, then regulate hot water into the heater core with the manual heater control valve and direct the air it with the push button controls which still utilize vacuum.

Any ideas would be appreciated.

What you are considering is basically what I did on my '77 280E shortly after buying it. So yes, it can be done. I removed the complete CC unit, including its wiring harness. It was necessary to replace the heater box as well. The doner was a '77 240D. Any manual control unit from a W123 will work, but since your 300D is from 1980, I would look for a manual system from that year in a 240D. Many 240Ds & 230s had manual systems. The only non-240D part I used was the thermostat from a W114 just for simplicity. It's a time consuming task, but well worth it.

bigmaq · #20 07-24-2008, 03:45 PM

There is a new unwired version called the ascii-diy for less than 1/2 the price. The only difference is that you manually switch a vacuum line for heat (winter) and cool (summer).

Whiskeydan · #21 07-25-2008, 12:27 AM

People, It's not that complex to "manualize" this system.
Air is directed thru the ducts via flaps controlled by vacuum pods. Heat (hot coolant) flow is controlled with a vacuum accuated valve. The AC compressor is active with a simple switch applying +12 volts to the clutch. The blower motor can be controlled (slowed) with resistance in series or a very simple PWM control circuit.

The "luxury" of these old beauties is the simplicity of the drivetrain that seems to last and last if maintianed. Why make the rest of the car complex??? It doesn't take much knowledge to figure it out.
I say if you have an old servo system that's problematic, yank that MF out and manualize. If you can't figure out how to do so, find another vehicle to drive.

JimmyL · #22 07-25-2008, 01:38 AM

Quote:

Originally Posted by Whiskeydan

People, It's not that complex to "manualize" this system.
Air is directed thru the ducts via flaps controlled by vacuum pods. Heat (hot coolant) flow is controlled with a vacuum accuated valve. The AC compressor is active with a simple switch applying +12 volts to the clutch. The blower motor can be controlled (slowed) with resistance in series or a very simple PWM control circuit.

The "luxury" of these old beauties is the simplicity of the drivetrain that seems to last and last if maintianed. Why make the rest of the car complex??? It doesn't take much knowledge to figure it out.
I say if you have an old servo system that's problematic, yank that MF out and manualize. If you can't figure out how to do so, find another vehicle to drive.

He forgets that we all aren't the electrical genius he is. And he is.......

vstech · #23 07-25-2008, 09:48 AM

Quote:

Originally Posted by Whiskeydan

People, It's not that complex to "manualize" this system.
Air is directed thru the ducts via flaps controlled by vacuum pods. Heat (hot coolant) flow is controlled with a vacuum accuated valve. The AC compressor is active with a simple switch applying +12 volts to the clutch. The blower motor can be controlled (slowed) with resistance in series or a very simple PWM control circuit.

The "luxury" of these old beauties is the simplicity of the drivetrain that seems to last and last if maintianed. Why make the rest of the car complex??? It doesn't take much knowledge to figure it out.
I say if you have an old servo system that's problematic, yank that MF out and manualize. If you can't figure out how to do so, find another vehicle to drive.

yup, sounds pretty simple... ya wanna post a D.I.Y. pictorial on this manualization? I am sure it would get plenty of use...

JimmyL · #24 07-25-2008, 10:30 AM

Quote:

Originally Posted by vstech

yup, sounds pretty simple... ya wanna post a D.I.Y. pictorial on this manualization? I am sure it would get plenty of use...

Your new avatar is very distracting. Isn't that Whunter's???

vstech · #25 07-25-2008, 10:39 AM

I got it off a VW forum. I did not know roy used that one. but hey like minds!
does it move on your browser?
what os and browser are you using? on mine only the head basher in my sig moves...