If it’s leak free keep it r12. If having to replace compressor etc probably 
best to go 134. Done right 134 works fine. 

Sent from my iPhone

> On Feb 14, 2023, at 5:31 PM, Allan Streib via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> I think converting R12 to R134a kills it.
> 
> If you have an original R12 system, keep it R12 or compatible. Do not charge 
> it with R134a.
> 
> 
>> On Tue, Feb 14, 2023, at 18:23, Dwight Giles via Mercedes wrote:
>> we only have 2 working. 82 300CD not working even after 1 year of  r134
>> change over.
>> 
>> On Tue, Feb 14, 2023, 5:58 PM Curt Raymond via Mercedes <
>> mercedes@okiebenz.com> wrote:
>> 
>>> It's only since 2019 when I got my 2015 Jetta TDI that we have all 3
>>> vehicles in the family having working AC...
>>> 
>>> -Curt
>>> 
>>> On Tuesday, February 14, 2023 at 12:36:31 PM EST, Randy Bennell via
>>> Mercedes <mercedes@okiebenz.com> wrote:
>>> 
>>> 
>>> On 14/02/2023 11:31 AM, Allan Streib via Mercedes wrote:
>>>> I have been without working A/C in my primary car for many long
>>> stretches of time. It's definitely nice to have but I've grown accustomed
>>> to being without it as well.
>>>> 
>>> I hear you. It hasn't worked in my old MB for a while but I generally
>>> only drive it close to home and with the windows down it is OK. I really
>>> do want to repair it though.
>>> 
>>> 
>>> Randy
>>> 
>>> 
>>> 
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