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1987 Euro 500SEC & 1988 Euro R107 420SL
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70 Posts
Discussion Starter #21
As promised, here is a list of all the major parts you will need and the cars they are used on. One word of caution: Just because a part number is used on a certain model does not mean it is used on all cars of that model. But I think if you get parts from a 1986 to 1989 RHD 500SL with manual air you will be pretty safe.

Also for some reason I could not find the controls or the compressor for the 420SL in EPC.

View attachment 2651310
Hello Roncallo

Thank you so much. It will be useful for me. I am still having discussion about getting the OEM AC Used parts.
Are those parts still available new, Ron? I heard the parts are no longer in production
 

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1975 280SLC
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107 Posts
Looks like the AC lines will probably be coming out on the right side of the engine compartment. That would put the US parts out of the question.
On my right hand drive ( 280 ) the compressor and hoses do run on the right of the engine looking forward.
Cant imagine where they would go on the V8.
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,808 Posts
Hello Roncallo

Thank you so much. It will be useful for me. I am still having discussion about getting the OEM AC Used parts.
Are those parts still available new, Ron? I heard the parts are no longer in production
I would say most parts are no longer available, I was able to get a condenser and lines for my 560SL. I have seen the evaporators available new and the heater core. I would defiantly put new ones in of those. I would recommend you find the largest parallel flow aftermarket condenser and fit that in place instead of the OEM. The system will perform a lot better with the parallel flow.
 

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1987 Euro 500SEC & 1988 Euro R107 420SL
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70 Posts
Discussion Starter #24
I would say most parts are no longer available, I was able to get a condenser and lines for my 560SL. I have seen the evaporators available new and the heater core. I would defiantly put new ones in of those. I would recommend you find the largest parallel flow aftermarket condenser and fit that in place instead of the OEM. The system will perform a lot better with the parallel flow.
Alright Ron, Btw what is the OEM compressor brand for the SL? is it Nippondenso or something else?
 

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1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,808 Posts
Alright Ron, Btw what is the OEM compressor brand for the SL? is it Nippondenso or something else?
I would assume that all the V8's used the Nippondenso for 1988. That is what the 1988 560SL used. I couldn't imagine them having two compressors but Mercedes has certainly done stranger things.
 

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Premium Member
1983 380SL, 2000 S430, 1991 420SEL (retired) - RHD
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5,840 Posts
This is what the old lever fascia with air
107  fascia.jpg
looked like. The levers have bee removed in the pic. They just pull out.
 

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Premium Member
1983 380SL, 2000 S430, 1991 420SEL (retired) - RHD
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5,840 Posts
The evaporator is at the front of the heater box (closest to the motor). I'm not sure if your box would just have an empty space or be totally different. I have a completely rebuilt box with all the cabin aircon bits ( no compressor etc). However freight to you would be outrageous.
 

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1987 Euro 500SEC & 1988 Euro R107 420SL
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70 Posts
Discussion Starter #28
I would assume that all the V8's used the Nippondenso for 1988. That is what the 1988 560SL used. I couldn't imagine them having two compressors but Mercedes has certainly done stranger things.
This is what the old lever fascia with air View attachment 2651648 looked like. The levers have bee removed in the pic. They just pull out.
Hello Aussie Merc

Thank you for showing the right panel for the AC. Mine does not have the 2nd round knob on the right. I will save this pic for my reference.
 

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1987 Euro 500SEC & 1988 Euro R107 420SL
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Discussion Starter #29
The evaporator is at the front of the heater box (closest to the motor). I'm not sure if your box would just have an empty space or be totally different. I have a completely rebuilt box with all the cabin aircon bits ( no compressor etc). However freight to you would be outrageous.
Hello Aussie Merc

The engine bay pic is at the 1st page but maybe it does not show the space in front of the motor.
Tomorrow I will ask the workshop people to take some pics of the engine bay with more details surrounding.

Can you list all the AC parts you have for the R107 please?
May I know what is the OEM compressor brand and part number for Aussie R107?

The workshop told me that they will need these major parts:
  • The Compressor complete with the Pulley and the Bracket
  • Ac Tensioner
  • Condensor
  • Evaporator
  • Pressure sensor
  • Ac control switches and the panel
  • Wiring for the ECU maybe to tell the engine to compensate the idle rpm when the ac turn on.
Thank you
 

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1987 Euro 500SEC & 1988 Euro R107 420SL
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Discussion Starter #30
I would assume that all the V8's used the Nippondenso for 1988. That is what the 1988 560SL used. I couldn't imagine them having two compressors but Mercedes has certainly done stranger things.
Hi Ron

Do you have the ND part number? I tried to trace the OEM R107 AC compressor from SL SHop Uk and came out the compressor brand is Harrison. I am thinking even if I can find this compressor, the future will be difficult for me if later on have to fix it because that brand is not available in Indonesia. For ND or Nippondenso is avaliable in here.

If I can use the ND plus the pulley and bracket plus the tensioner, that will be a great start
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,808 Posts
Hi Ron

Do you have the ND part number? I tried to trace the OEM R107 AC compressor from SL SHop Uk and came out the compressor brand is Harrison. I am thinking even if I can find this compressor, the future will be difficult for me if later on have to fix it because that brand is not available in Indonesia. For ND or Nippondenso is avaliable in here.

If I can use the ND plus the pulley and bracket plus the tensioner, that will be a great start
For some reason my EPC does not show the AC compressor or compressor line set for the 420SL so I don't have the part numbers. The US spec 380 SL came with this style compressor and I see no reason why these parts shouldn't fit as the 380SL is a 107 equipped with this compressor.

US spec 380SL parts:

Ref #Part NumberDescriptionNotes
NAA0031312501AC CompressorSuperseded
NAA0002304911"Current
NAA1171300457Compressor Line SetSuperseded
NAA1171300857"Superseded
NAA0001300357"Current
101​
A1171300335Compressor Mount
212​
A1161310541Idler Bracket
146​
A1161300460Idler Pulley
149​
A1159900219Pulley Bolt
152​
A1151320053Pulley Bushing
140​
A180466xx51Spacer Ring 2 requiredxx = 01 to 10 selective increments of 0.25mm
92​
A1171340053Spacer
227​
A1161310051Spacer

2651822


2651824
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,808 Posts
For some reason my EPC does not show the AC compressor or compressor line set for the 420SL so I don't have the part numbers. The US spec 380 SL came with this style compressor and I see no reason why these parts shouldn't fit as the 380SL is a 107 equipped with this compressor.

US spec 380SL parts:
Also A note on the Harisson compressor. This compressor is probably the most common compressor in the world up until the mid 1970's and used on most larger luxury cars and truck up to the late 80's. It was manufactured under several different names ,including Frigidaire, AC/Delco, Delphi, and Harrison. Commonly referred to here in the US as the GM A6 compressor. This is a very heavy compressor made with a steel case. There are aftermarket Aluminum versions of it made out of Aluminum. Something should be available in your country.
 

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1987 Euro 500SEC & 1988 Euro R107 420SL
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70 Posts
Discussion Starter #33
Also A note on the Harisson compressor. This compressor is probably the most common compressor in the world up until the mid 1970's and used on most larger luxury cars and truck up to the late 80's. It was manufactured under several different names ,including Frigidaire, AC/Delco, Delphi, and Harrison. Commonly referred to here in the US as the GM A6 compressor. This is a very heavy compressor made with a steel case. There are aftermarket Aluminum versions of it made out of Aluminum. Something should be available in your country.
Thank a lot Ron

Let me try to find the Compressor and the supporting parts base on the part numbers you provided
 

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Premium Member
1983 380SL, 2000 S430, 1991 420SEL (retired) - RHD
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5,840 Posts
The evaporator and controls are a complicated piece of kit. Especially with the probe and gas filled wire. I'd be looking at aftermarket. Your fascia has the space for a switch. See the right side on mine.
107  fascia.jpg
 

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Premium Member
1983 380SL, 2000 S430, 1991 420SEL (retired) - RHD
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5,840 Posts
When it comes to 107 aircon I think it's fair to say Roncallo has forgotten more than I ever knew :)
 

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1987 Euro 500SEC & 1988 Euro R107 420SL
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70 Posts
Discussion Starter #36 (Edited)
When it comes to 107 aircon I think it's fair to say Roncallo has forgotten more than I ever knew :)
Hi Aussie Merc

After long discussion with the workshop, they want to do custom with some OEM parts in the mix.
if by chance you have this part to for sale:
  • The AC switch for sale
  • AC Extra Fan + Bracket
Thank you
 

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Premium Member
1983 380SL, 2000 S430, 1991 420SEL (retired) - RHD
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5,840 Posts
Hi Aussie Merc

After long discussion with the workshop, they want to do custom with some OEM parts in the mix.
if by chance you have this part to for sale:
  • The AC switch for sale
  • AC Extra Fan + Bracket
Thank you
The AC switch behind the fascia is a complicated one using electric recognition of the gas expansion in side the probe and 3 vacuum controls. You would not need one of these in an aftermarket fitting. Apart from that they are NLA. Even the Ranco switchbox at the back is NLA.
107 AIRCON SWITCH PROBE 002 copy.jpg
107 aircon on- off switch 004.jpg
107 AIRCON SWITCH knob  REAR VIEW copy.jpg
 

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1987 Euro 500SEC & 1988 Euro R107 420SL
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70 Posts
Discussion Starter #38
The AC switch behind the fascia is a complicated one using electric recognition of the gas expansion in side the probe and 3 vacuum controls. You would not need one of these in an aftermarket fitting. Apart from that they are NLA. Even the Ranco switchbox at the back is NLA. View attachment 2652075 View attachment 2652076 View attachment 2652077
Ah Ok Aussie Merc, let me ask the workshop to go aftermarket too for the AC controller switch then.

Thank you for making it clear
 

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Premium Member
1983 380SL, 2000 S430, 1991 420SEL (retired) - RHD
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5,840 Posts
You could probably use an original knob pulled apart, modified and then re attached to look like a pair to the fan speed one.The knob part is all nylon/plastic.
 
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