hi all,
I am hearing a loud vibration or rattling type noise from my 01 explorer when I idle with the AC on. I had a similar noise after changing the serpentine belt, turned out the pretensioner was bad, so they replaced it. Twice. The latest is a ford factory tensioner. THis noise (current) is louder with the AC on. The AC works great, no noticable problems. Any idea what it could be, other than anaother bad tensioner?