You turned the rotors and they warped again...that's where the shudder is coming from...it's very common and hardly anyone turns them. If they're warped, we replace them...it's really not that expensive. If you need new ones, buy the OEM Volvo ones (made by Zimmerman, I believe) from www.fcpgroton.com

The other issue you mention could be the serp. belt tensioner and not the belt itself. In other words, the belt might not be bad (at 10K miles) but the piece the belt goes around could be, and needs to either be replaced or the belt taken off and it (not the belt) lubricated thoroughly. Spraying the lubricant on the belt is probably getting on the tensioner too and helping it, but only for a short while.

I believe I'd just keep up on these boards and learn what you need to learn, so youll "know your stuff" when you talk to a mechanic. Many assume that women don't know anything about cars, but if you show them that you do, then they will take you seriously. If you don't have confidence, then let your boyfriend or whoever go with you.

If the same mechanic who turned your rotors is claiming the serb belt is bad, then I would find a different mechanic. Where do you live? Maybe someone here can make a good suggestion concerning one.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.