I know exactly what noise you heard, I had the same wee wee wee noise onthe Misses 07 Hemi Aspen. I could here it when idling in the garage but not under acceleration. I could not pin point the source, so I brought it in to the dealer under warranty. The wee wee wee disn't really bother me too much, it was a pretty faint sound. Well, they barely heard it (of course it was noisy in the bay) and said it sounded normal to them. Knowing that I had a lot of warranty left and the vehicle was new,I figured I would let a few miles build up and see what happens. Low and behold, at 8000 miles, no more wee wee wee. Don't know what it was or where it went, but it is gone.

 

Strange. He is going to a dealership in another city Friday so we'll see what they say.