jwa Posted November 15, 2019 Share Posted November 15, 2019 Greetings, So i assume that an early Packard A/C unit would need R-12 Freon? Does anyone have info/ experience on adding a clutch to an original A/C compressor? Who has a working unit? Thanks, Jerry Link to comment Share on other sites More sharing options...
bryankazmer Posted November 20, 2019 Share Posted November 20, 2019 It would help to clarify if you are talking about the fifties version or the 40-42 version. I believe both used Freon, but the prewar units are much harder to locate Link to comment Share on other sites More sharing options...
jwa Posted November 20, 2019 Author Share Posted November 20, 2019 My bad, yes 1940-1942. Link to comment Share on other sites More sharing options...
DLynskey Posted November 21, 2019 Share Posted November 21, 2019 (edited) In the 1950's a gentleman I know had an untouched 1942 limousine with factory A/C. The unit was in the trunk and had a very prominent yellow warning tag. "Caution -- Due to wartime restrictions the only gas available for this unit is poisonous. In case it develops a leak evacuate the car immediately". I assume from the warning that the war-time units used ammonia as a coolant. Don Edited November 21, 2019 by DLynskey spelling (see edit history) Link to comment Share on other sites More sharing options...
HH56 Posted November 22, 2019 Share Posted November 22, 2019 On 11/20/2019 at 6:16 PM, DLynskey said: I assume from the warning that the war-time units used ammonia as a coolant The war era refrigerant replacement was Methyl Chloride. 1 Link to comment Share on other sites More sharing options...
DLynskey Posted November 22, 2019 Share Posted November 22, 2019 As rare as they are I figured someone on this forum would come with a copy of the warning. It's not exactly the wording I remember seeing 60 years ago, but the tag doesn't identify the refrigerant used. Don't worry about my aging memory. It's actually getting better. In fact it's so good now my wife keeps telling me that I even remember things that never happened. Don Link to comment Share on other sites More sharing options...
jwa Posted November 22, 2019 Author Share Posted November 22, 2019 Wow, Thanks HH56! I'd never seen that before. A great detail item. I appreciate you sharing ! Jerry Link to comment Share on other sites More sharing options...
8E45E Posted January 31, 2020 Share Posted January 31, 2020 On 11/20/2019 at 7:16 PM, DLynskey said: In the 1950's a gentleman I know had an untouched 1942 limousine with factory A/C. The unit was in the trunk and had a very prominent yellow warning tag. "Caution -- Due to wartime restrictions the only gas available for this unit is poisonous. In case it develops a leak evacuate the car immediately". I assume from the warning that the war-time units used ammonia as a coolant. Don Some speculate the extensive devastation caused by the fire in the Cocoanut Grove/Melody Lounge fire in Boston in 1942 was likely from Methyl Chloride leaking from one of the coolers at the time. Although the actual fire was started from a staff member relighting a candle, igniting a curtain, it was the sudden acceleration of it that baffled the investigators and the NFPA for several years, at first blaming highly flammable plastics which were new at the time. In later years, the investigators concluded the possible substitution of standard refrigerant for Methyl Chloride was partially to blame. Craig Link to comment Share on other sites More sharing options...
dan1 Posted June 24, 2020 Share Posted June 24, 2020 Craig, It is not a big deal to change the size of the expansion, and fill valves, then upgrade the flex hoses to use R-134. If you don't want to do your part for the planet you can supposedly buy R-12 in Mexico. Our 41 Coupe with factory air has a FMOCO compressor with a clutch.. The running driving car will be listed on the AACA forum for sale at $23,500 in the next day or so. Daniewl Link to comment Share on other sites More sharing options...
West Peterson Posted June 24, 2020 Share Posted June 24, 2020 You don't need to go to Mexico for R-12. It is readily available (relatively readily available). Many people hoarded it many years ago, and now supplies seem to be back down to normal prices since hardly anyone needs it anymore. Link to comment Share on other sites More sharing options...
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