In Reply to: What is that #[email protected]*! Humming Noise!? posted by Kirk on October 06, 1999 at 10:41:03:
...the load leveling system in my Expedition. You don't have the trailer-towing package, do you? :) jk
Maybe some sort of bad bearing in an electric accessory? I've had a bearing squeal before (not on my M). Radiator fan? Water pump?
Mine's at almost the same mileage as yours - I'll listen for it today...
: This morning I was in the parking lot with the engine running, radio off and fan off and all I could hear is this humming noise. It had a higher pitch too and it wasn't that subtle. Revving the engine did not change its pitch and as I said I had no accessories running. This has happened intermittently. It was a little cold this morning (45 degrees), but I don't think weather is a factor. I did a walk around the car and could hear it more towards the right front, but not as loud as it was in the car. The car is a stock 99 with 6400k on it. Any ideas?