I'm slowly going through all of mine. I converted my 560SEL back to R12 as the R134 was becoming less effective in the Texas heat. I got the A/C working in my 560SEC. Last year I got the a/c working on my 500SLC and my 500SL.

My 6.9 has fantastic A/C and it's running R134 so I leave it well alone.

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With best regards

Al