I have 2005 CLK320 with a bad engine control module, had the same problem with t

What is your question?

I have 2005 CLK320 with a bad engine control module, had the same problem with the car in the beginning of this year, the cooling fan run on high constantly and tells me to "Visit Coolant Work Shop." Sent the ECM in and had it reprogramed and fixed the problem, it reoccurred with the same problem cooling radiator fan running on high constantly and tells me to "Visit Coolant Work Shop," so sent it back in and they could not repair it this time. My question is, can I take an ECM from a donor car (salvage) and replace my old ECM with that one. If so, what else would I have to do besides also switching the key and ignition switch? Would I have to change anything else, like the truck locks or door locks, etc.….? Thanks!