I too have to go through this. The A/C failed on my W123, it is inop in the W124, and was working when I purchased the W126.

I am hoping to get our 2 wagons 'chilling' again.

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83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.