In my 05 Elantra I get a grumbling sound comming from the speakers (not constant, just sometimes), this happens even if the volume is turned all the way down.It sounds like when some one blows into a microphone or breathing heavly on the phone. This noise can also be heard when using CD player and both AM/FM radio (note: I have a motorized antennawith factory receiver and factoryspeakers).

Any tips or adivce. Thanks

 

I had a similar problem and took it to the dealer. Apparently, there is a known problem with the radio/CD system in the 2005. The dealer has a kit that will fix it.At first they tried to say that it wasn't under warranty, but I pushed it. If it wasn't aknown problem, why would they have a fix-kit for it?

Good luck.