great thread. Much like the recent post above, I have 4 mercedes and only one has working A/C.

So in an effort to get 2 of the cars with working A/C in the next couple weeks, I want to test the system first and then flush as necessary.

Question: when considering flushing the system with acetone and compressed air, would it not be best to back flush? So then I would need to know direction of flow for each side of the system, yes ?


I will report back once I have a better idea of the status of each system.

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85 300D 3 pedal. Current project.
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.