Please help me with a noise problem coming from the fusebox in th eengine bay on driver's side. I've heard there is a cooling fan below this fusebox. The noise started after I replaced the auxilliary water pump. Should I be worried or can I continue to listen to the fan's song?? :-)) The truck is '99 ML 320.

Thanks in advance.

Cooling the COMPUTERS in the fuse box is important!

Have the fuse box cooling motor replaced OR replace it yourself..

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Thank you, MB Doc. I'm glad that you confirmed my suspicion about the cooling fan.