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noise hours after car is parked and turned off

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136K views 43 replies 25 participants last post by  paulieb480  
My 2006 CLS 320 has been sitting on my drive for nearly 5 weeks without running. I went out this morning and there was a quite loud buzzing noise coming from the engine near the passenger side. I opened the car and started it but the noise continued. I had to shut the car down and disconnect the battery to make it stop. Any ideas?
My idea is that as this is a GLA-dedicated forum you may be better served at a Benz forum that discusses a number of different/older models, such as Mercedes-Benz Forum