Nice work, Jeremy. I'm sure I'll have to do the same to my W124 as my fresh air/recirculation switch appears to have no effect on the air. It's either this or a vacuum module- not sure what else it could be.

Another gremlin I have is I cannot get the highest airflow to work in manual mode. It 'works' in auto mode but it takes a few minutes before the air flow will get to the highest output. Not quite sure if it's related (ie- due to various doors not fully opening/closing, or due to an a/c logic system not kicking in) but I'll play with it soon.

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1993 E250 2.5L TD 230,000 kilometers
Vicenza, Italy