The FSM is really helpful when debugging the ACC. Do you have access to it?

To remove, you need to pry the zebrano panel off. Then there are screws holding a retaining plastic piece in, and the ACC comes right out.

Be careful, you will need to GENTLY remove the lightbulbs from their places, as well as the two main ire harnesses from either side.

I do not think you need to also remove the radio to get the ACC out, when I pulled mine the whole dash was coming off. Maybe someone else can verfiy this for me?

This early parts of this article may be hepful in showing the underdash: http://www.peachparts.com/Wikka/W123Evaporator

dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car