79Mercy, I do not think you pic posted correctly... and I could not put that into location box and go there either.. can you try again ? thanks,
Ok now I see the picture... I guess I will have to get the books out to deal with this... if the car has a txvalve.. that wouldl usually include the function you attribute to this switch...
So yall may have to finish with the puzzle....

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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