I've got the exact same problem with my Canadian-spec '05 X-Trail SE. In my case as well, my initial inquiry to the dealer resulted in an "it's normal/could not reproduce" response.
My obsessive search for the source of the hiss has led me to the passenger-side tweeter grille, through which the side window defroster airflow passes. I'm not 100% sure, but I think the whistling sound is because the seal is poor between the dash duct and the outlet in the grille. I think the cold weather worsens the problem because the foam stiffens up and/or shrinks.
On thing I have confirmed, though, is that same speaker grille makes a rubbing noise every time I hit a bump, so I'm going to ask my dealership to replace it, and hopefully do something to improve the seal as well. I'll let you know if I have any luck.
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Originally Posted by KelS
Hi everyone. I'm a newbie here and have a question for anyone else with an X-Trail in Canada. Got in in August and absolutely love it, except for one thing... the fan makes a high-pitch whistling sound on all fan settings, but the higher you go, the worse it gets. And it also changes depending on which setting it's on (floor, front window etc.). When I had it in for the first oil change I asked them about it and they said that's just the way it is. I accepted it initially, but now that the weather is much colder and I'm using it more often, it's really getting annoying. My husband just turns it off when he's riding with me. He can't stand it. Has anyone else experienced this? I want to take it back to the dealership but though I should ask around first.
Thanks!
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