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Hello, I recently noticed there is intermittent short buzzing noise from the AC control unit "lower deck" from my C300 4Matic. It started 2 months ago "the time when i noticed it", however, I am not sure if it was there since day 1, perchance music from the sound system camouflage the issue...... Anyhow, I brought it in to MB since it should be under warranty and it came back No Fault Found. Based on educated guess, MB replaced the unit anyway (at least they claimed they did and no service paper work available at the time when i picked up my car) and since then, it's been quiet until now "four days later", i started to hear the intermittent short buzzing noise again. I am wondering is this noise a standard thing from the unit or, MB just fake they replaced it or something else ? Any suggestions ? Thanks
 
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