The chances of any normal human being having all the special tools to do this correctly is zero... I have the MB AC manual with the take apart procedure..
but my scanner is not set up at this time.... if you take my word on it it will save you a lot of time and effort... find a good new one and install it correctly.. meaning full flush before hand.. you know all the rest of the ' drill '... and do not hit it with any sticks...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html