A few days ago my "washer/water fluid" light came on because my windshield washer fluid got low. Today I was headed to get some washer fluid and a very loud solid screeching tone came on thru the radio speakers that would only go away when I shut the radio off. It was not affected by turning the volume up or down. I could hear the radio station in the background get louder if I turned the volume up but the screeching tone was deafening at all times. Later today it quit doing the screeching tone but I am wondering what the heck it was and why.....

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1999 CLK 430
W208
113. Engine
105,000 Miles
Raptor 245/40/17