Mystery(misery?) vibration, I am determined to find a solution.

[Dragonslayer182]

It's not exclusive to having the A/C on. In fact, I haven't noticed it making a difference, though I'll test it later today. It also seems to come at random except for when it's starting up, where it almost always squeals if it's not been on in an hour or two. Putting it into R or D usually makes it worse, likewise putting it into park usually helps stop it.