My XC70 makes a weird whistling type noise in heavy rains that last a long time. It doesn’t do it in light rains, or rains that are heavier but don’t flood roads or collect water on the shoulder or slow lanes, only the really heavy, hard to find the road type.
There are no warning lights when it happens, turning off everything, except the car and windshield wipers, doesn’t help. Pulling off the road, helps after about 30 seconds, but then we start again, and it continues. This is only happening during really heavy rains, is scary, and I don’t have a clue what it’s doing or why nor does my mechanic.
Help please, and thanks.