It's really intermittent. Had it once about a week ago, then had it again today.

When rolling down a side street around 40 km/h, I can hear this really high pitch squeal, squeal, squeal, squeal. It happens when I'm NOT applying the brakes, just rolling along normally. When I do apply the brakes the sound DOESN'T change. So I'm thinking it's NOT brake related.

And then the next day I'll go for a drive and all of a sudden it's gone. That's the confusing part.

Just reading through some other posts, I wonder if it's the A/C compressor?