S212 E-Class cabin temperature sensor replacement

[Hiacekim]

Hi everybody My cabin temperature control is all over the place fan kicking in and out..so I had a star plugin,that showed that the temperature sensor behind that little microphone grill left hand side of the steering wheel needs replacing as showing the -50c on the readout.... Very inexpensive part purchased now how to get to it to change it... I tried taking the front trim and the radio out to get down the side but it's all closed box. I can feel up the left hand side of the steering column cowl to get my hand around there but not enough.... Next job I suppose is to take the steering column cowle off to give me more room to maneuver.. Has anybody completed this job of how did you do it please.
I can't find anything on utube or the forums covering in any detail of this job being completed,any help would be great,thanks Kim