Yes, The inst. cluster is most likely faulty. Sorry you will have to replace it because it is out of warranty. Mercedes did offer a rebuilt board that could be fitted into the clusters when they were having to flip the bill, but when the affected cars went out of warranty they discontinued the parts. Now you have to buy a new cluster. The new one will have all digital numbers on the odo and trip odo. You have to get the millage calibrated. As for the evaporator I have not heard of any one getting help on it; that's not to say it hasn't ever happened.