[W126 Coupe] A/C Question About R12 & R134

[Josh Allen]

My 134 fittings all have a small thread on the inside, where the 
schrader valve and the cap screw in.
The r12 fitting is threaded both inside and out, and only about 3/8" 
overall diameter as opposed to the roughly 1/2" of the r134 fittings.

-Josh

Michael de Holl wrote:

> Thanks for the quick reply. Looks like the connection is a push on but 

> not sure. The connection has threads on the inside that the blue cap 

> screws onto. What do you think?

>

>     ----- Original Message -----

>     *From:* Mike R. <mailto:mramay at att.biz>

>     *To:* 'Mercedes Coupes Mailing Lists' <mailto:mbcoupes at mbcoupes.com>

>     *Sent:* Saturday, August 29, 2009 12:03 PM

>     *Subject:* Re: [W126 Coupe] A/C Question About R12 & R134

>

>     The R134 connections are push on (no threads) and the R12

>     connections are threaded. Whatcha got??

>

>      

>

>     Mike R.

>

>      

>

>     *From:* mbcoupes-bounces at mbcoupes.com

>     <mailto:mbcoupes-bounces at mbcoupes.com>

>     [mailto:mbcoupes-bounces at mbcoupes.com] *On Behalf Of *Michael de Holl

>     *Sent:* Saturday, August 29, 2009 8:40 AM

>     *To:* Mercedes Coupes Mailing Lists

>     *Subject:* [W126 Coupe] A/C Question About R12 & R134

>

>      

>

>     Just got my 91 SEC back from a trusted Mercedes specialist

>     independent shop for an A\C charge. He said the car needed a

>     partial charge and the temp now at the vent was 42 degrees. On the

>     paper work it says he used R134A refrigerant. As far as I know my

>     system is still R12. There are no tags or decals saying anything

>     different. Can you put R134 into a R12 system? What damage can

>     this cause? Its the weekend so I can't verify what he put in until

>     Monday. Any suggestions?

>

>     Mike

>