I would like to know some data about AC charge in the 126.
1) how many ounces of R12 needed if system is completely empty and clean.
2) how many ounces of oil in the system (split in compressor and dryer
3) Is BJ frigi quiet the compressor oil to use.
Is anyone on the Forum who could guide me trough the process
I have the R12 license, know some basics but I am not an expert.
My system is not working since I own the car 3 years ago. No pressure on the system. And I want to get the AC back to work. Thanks
Martin

On my W126, I think its something like 2.9 pounds of R-12. Yours could be different. I think you should replace the drier and possibly the expansion valve with new o-rings for all. Not sure about the oil. As for the oil requirements, I think you need to drain and measure what oil was in those componets and fill them back with the same amount of fresh oil.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

There is a data sticker under the hood - Here is a thread from months ago where I posted a picture of the data sticker

Proper R-12 Charge in '87 300SDL

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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif
15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
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Did you even find the source of the leak? It would be a shame to go through all that work only to have it leak out again.

__________________
1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

THE BG is good oil. I have it in my system.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

No, I haven't looked for the leak yet but would love to. This might be one of the first tasks. . I hope it is not a leaking evaporator.
Can you tell me how to search for the leak in the system successfully?
pump air in, like 5 bar and watch how the system holds the pressure?

Second task would be testing the compressor?
Can any one guide me?
Martin

I had in mind to check the operation of the compressor, short it with the low pressure switch and see if the clutch engages, then try to turn it. May be tak e it out and drain as much as I can. Is that what you call drain? I for sure will put all new o-rings on, new dryer and expansion valve. Looking for the leak at forst might be a good option. So at least I can see if there is major leak somewhere. Martin

I found the very same sticker in my SDL: 1300g (2.86 pounds or 46.85 oz) of R12
Any idea how much compressor oil is needed? SOem say 8 oz, 4 in the compressor 4 in the dryer?
How precise do I need to be when filling? Are 3 cans with 14oz = 42oz ok?
Or do I need 3.3 cans? What are you doing with the open cans.
How do you handle this in reality?