Not knowing the specifics... ...just asking: Is it possible to drill (carefully!!!) a few strategic holes in the surrounding case, and "flood" the case with coil cleaner a few times - and maybe, do a 1/2 way decent job?
Like I mentioned earlier, I really don't know the specifics of the evapoator set-up. I'm just wondering if there is a chance this might make a substantial difference, without the time involved in removing the evaporator. The job appears to be a daunting task; not only the labor involved, but I strongly suspect some brittle-with-age plastic parts might not survive the ordeal. Any thoughts here?

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82 300D Turbo 124,000 mi.