The pod that I unhooked on my two 116 cars only purpose as far as I can tell is to keep one fresh/recirculate flap open so 20% outside or fresh air is coming in. So when the compressor is on it would hold the flap open.

This flap would stay open all the way and when the compressor switch is turned off when turned on it would close up but not all the way. Unhook the line and the flap would close al the way. Plug the line with somthing.

If you look you can tell exactly what and how to do this on you own car. It was a painless and easy mod.

I have read here about doing the same thing in a 123 car but I have yet to sort it out in my project 123 car.

Happy to help.

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1980 300SD Manganese Brown Metallic Clearcoat 248k
1979 300SD White 148 k
1984 300D Silver project car for daughter
1982 300D wrecked
1980 300SD 310K not running