A/C and heat problem on 2002 Mercedes-Benz C240

okay so when i turn on my air conditioner or heat in my 02 mercedes benz c240 nothing comes on, what could be the problem?

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3 answers
IT COULD BE THE TEMP CONT PANNEL WE WOULD NEED TO CHECK IT THOUGH!
I have the same problem, after some research I found that one of three is the problem, the Compressor, the Altenator, or the Control Unit.
this car is almost impossible to diagnose without having the MB scanner and diagnostic software specific to this car. suggest a local MB specialty shop diagnose this for you.