Jim, if you are going to play... you are going to have to read the thread....LOL

post 5 says :
"They told me I needed a new auxiliary fan and temp switch, but I repaired the fan easily, tested the switch and circuit according to the service manual
And it works now. It comes on while the car is idling and it is hot out, but only after idling about 2 minutes when outside temp is 95or so. "

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

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