I have a 1996 Dodge Grand Caravan and have been having a problem with the radio lately. During summer time when the air conditioner or even the blower fan is on you can occassionally hear it through the radios speakers. Then certain times when I come to a stop the entire radio will make a very load hhhmm or buzzing sound through the speakers. The instant I turn off the radio it stops. Now it only does this every once and awhile. I replaced the battery the otherday and it stoppped for awhile but it has started back up again. I have heard that certain 1996 oem radios have gone or go bad over time and would like to know if thats what I need to replace or not. Any help would be greatly appreciated. Thanks