Hi Chuck, The purest AC Service Tech's will recommend that you replace the Dryer if the system is opened up. If you are switching from R12 to R134a ... You will need to replace the Dryer. The difference between an R12 and R134a AC dryer lies in the desiccant used. Older R12 dryers had desiccants that are not compatible with R134a/oil, but if the dryer was manufactured after 1993, the desiccant should be compatible with both refrigerants. When converting an AC system from R12 to R134a, it is recommended to replace the dryer with a new one that has a desiccant compatible with R134a. For more details .. here is a good reference: https://www.perplexity.ai/search/r12-r134-ac-dryer-diference-5JelBMroRqeCiDY... As for the foam around it... I have no idea. Best regards, -dt Don Thomas On Thu, May 29, 2025 at 9:15 AM Charles Engles <cengles@cox.net> wrote:
Dear Forum,
This is a trivial question about the dryer in the Pantera AC system.
Is the stock factory foam insulation over the dryer necessary if converting to R134? Mine is fifty years old and ready for retirement. Must it be replaced?
Curious, Chuck Engles _______________________________________________
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Hi Chuck, The purest AC Service Tech's will recommend that you replace the Dryer if the system is opened up. If you are switching from R12 to R134a ... You will need to replace the Dryer. The difference between an R12 and R134a AC dryer lies in the desiccant used. Older R12 dryers had desiccants that are not compatible with R134a/oil, but if the dryer was manufactured after 1993, the desiccant should be compatible with both refrigerants. When converting an AC system from R12 to R134a, it is recommended to replace the dryer with a new one that has a desiccant compatible with R134a. For more details .. here is a good reference: [1]https://www.perplexity.ai/search/r12-r134-ac-dryer-difere nce-5JelBMroRqeCiDYC3RLc4Q As for the foam around it... I have no idea. Best regards, -dt Don Thomas On Thu, May 29, 2025 at 9:15 AM Charles Engles <[2]cengles@cox.net> wrote: Dear Forum, This is a trivial question about the dryer in the Pantera AC system. Is the stock factory foam insulation over the dryer necessary if converting to R134? Mine is fifty years old and ready for retirement. Must it be replaced? Curious, Chuck Engles _______________________________________________ Detomaso Email List is not managed by POCA Posted emails must not exceed 1.5 Megabytes DeTomaso mailing list -- [3]detomaso@server.detomasolist.com To unsubscribe send an email to [4]detomaso-leave@server.detomasolist.com To manage your subscription (change email address, unsubscribe, etc.) use the links above. Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages. References 1. https://www.perplexity.ai/search/r12-r134-ac-dryer-diference-5JelBMroRqeCiDY... 2. mailto:cengles@cox.net 3. mailto:detomaso@server.detomasolist.com 4. mailto:detomaso-leave@server.detomasolist.com