Singing fusebox
 

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..

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