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I bought a pre-owned Volvo XC90 - 2007 3.2 V6 AWD. Or at least that's what it says on the car and the paperwork.
Even in the dry, this car regularly spins the front wheels and there is fairly significant torque steer on acceleration.
In the wet, the car stood still today on a hill with the front wheels scrabbling for grip. I owned a AWD Volvo XC90 previously but never experienced wheelspin or torque steer...
How can I be sure before I approach the dealer about this?
First thing I'd check is that it's got the AWD driveline - there should be a driveshaft from the gearbox in the front connecting to a diff at the rear "axle", plus driveshafts from each rear wheel to the diff. If that's missing, well, there's your problem...
Assuming it has an AWD driveline, my suspicion would be that the center diff that is supposed to feed power to the rear wheels isn't working as it should. A lot of the more recent FWD-based cars normally run something like a 90/10 front rear split and only feed more power to the rear wheels if the front wheels have traction issues. Actually, according to this review of a 2006 XC90 the split is 95%/5% under normal circumstances and can change up to 50%/50% depending on conditions.
FWIW, I've driven an AWD Volvo XC90 several times before and that was my experience as well. If that's normal, then it's the worst AWD system I've ever driven. Had terrible torque steer under hard acceleration, and front wheelspin was a major issue on loose surfaces. Didn't think much about it (even though it was new when I first drove it, and continued to drive it occasionally until it was about 2 years old) since it wasn't my vehicle...
Have you tried checking to see if there are any recalls for it?
Get all four wheels off the ground (either take it to a shop and put it on a lift, or put it on four jack stands), give it some gas, and have somebody check if all of the wheels spin.
