Last day or two when I start the 155 from cold I get a loud buzzing noise from what appears to be deep inside the dashboard. It goes away after a few minutes. Yes, I've already checked for, and eliminated, bees, wasps other insects and vermin but the noise is still there. Car is '97 2.0L Super with climate control and aircon. Noise is there whether the aircon/climate control is on or off. Any ideas?