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#1
10-06-2021, 03:54 PM
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W123 A/C Leak Detecting
Oh, boy ~ it's been decades since I did A/C repairs and now my 1982 240D has leaked out all the R134a .
Where to begin ? . TIA,
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better 
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#2
10-06-2021, 11:55 PM
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I replaced all the rubber hoses, using better "barrier hose". For the large suction hose, I used "reduced barrier" for a smaller OD. You need to cut the shells off the fittings to re-use, since I don't think they are available. M-B used thick ferrules, but you can get them off w/ a hacksaw, screwdrivers, and vise. If changing to a newish parallel-flow condenser or Sanden compressor, you can use more common O-ring fittings at those ends. If you don't have a ferrule crimper (I do), you can use Oeticker stepless ear clamps (ebay) and perhaps even PEX ferrules from Home Depot for some hose sizes. Download a hose catalog (Gates or Goodyear) and check dimensions. Replace all O-rings with HBNR type (usually green). Fill with oil w/ uV dye so you can find future leaks easier. I used PAO 68 oil which works with all refrigerants and Duracool HC refrigerant. R-134A is a potent greenhouse gas so is being discontinued.
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1984 & 1985 CA 300D's 1964 & 65 Mopar's - Valiant, Dart, Newport 1996 & 2002 Chrysler minivans
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#3
10-07-2021, 02:15 AM
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What compressor is on it? The Gm R4 has an engineered leak to keep the outer shaft seal lubricated.
Like Bill Grissom, I use Duracool HC. Less head pressure than 134 and cools like R12.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#4
10-07-2021, 02:18 AM
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Thanx guys ! .
I'd rather not change the hoses if I don't have to.... It has a nice new Japanese made SANDEN 7 compressor . I checked it to - day, zero retained pressure dammit .
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#5
10-07-2021, 02:22 AM
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Pull a vacuum on it. See what happens.
When was it last serviced? Also, check the condenser for damage. Rocks love them. I hate that the condenser is also used as an expensive rock shield for the radiator.
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#6
10-07-2021, 02:43 AM
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It was recently serviced, that's why I'm so upset .
I don't have a vacuum pump . I will give the condenser a gander .
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#7
10-07-2021, 02:59 AM
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I do not have one, either, so I do the lend lease program from Auto Zoo.
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#8
10-07-2021, 06:17 AM
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Quote:
Ac leaks should ONLY be found and tested with pressure. Vacuum is for removal of air and moisture. ONLY after leaks have been eliminated…
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#10
10-07-2021, 08:19 AM
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I have had good luck going through system and replacing all orings. I run envirosafe, which like duracool runs lower pressures.
__________________
1985 300 TD 448K 1984 300 TD 278K 1983 240D euro 240k 1994 f-250 idi turbo 330K 1986 f-350 IDI 1987 F-350 IDI 1985 JD 1050 4wd 1965 IH 3660
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#11
10-07-2021, 08:28 AM
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Quote:
Yep - I’m no chemist but I understand the duracool/envirosafe molecule is larger like R12, so hose porosity is less of a concern. “It’s the future” lol. Sent from my iPhone using Tapatalk
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#12
10-08-2021, 10:01 AM
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What is " auto zoo "? .
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#13
10-08-2021, 11:18 AM
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A derisive term for AutoZone .
__________________
78 W116 300SD 'Desert Rose' new as of 01/26/2014 79 W116 300SD 'Stormcloud' RIP 04/11/2022
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#14
10-08-2021, 11:49 AM
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Many years ago when R12 was the freon commonly in use there was an electronic freon leak detector. It used a wand to pass over suspect leak areas and if it started beeping you found the leak. Possibly such a leak detector exists for the newer refrigerants and is available for loan from Auto Zone.
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#15
10-08-2021, 08:26 PM
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A Little Help
Thanx guys ! .
My tools fed my family for 50 years so I never think of loaner tools . I'll give AutoZone & OReilly's a look, see what they have .
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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