XC70 screams when wet

[pelaton]

I have a 2006 XC70 with 41K on it. It runs great but twice now, when it's been VERY wet on the roads, we'll start to hear this screaming sound from, I think, underneath. The pitch does not vary with speed and if I throw it into neutral and cost, it still has no change. We'll come to a stop and I'll race the engine for a minute then it seems to quiet down. We'll start driving and once again, it starts. I can't create it, or stop it. After the roads dry up, it fully stops. I don't notice any performance issues while it's happening. The temperature stays constant. It's just this horrible, loud screaming/whining. We bought the car for Christmas last year with 32K on it and within a week, the turbo had to be changed. It was blowing smoke. It's been fine since. Any thoughts?

[JRL]

You have rain squeal
Common in R's not so common in XC's
The exhaust expands when wet and it contacts the driveshaft,
See Volvo for the fix