we have 99 RX300.
has 116K miles.
about 2 years ago, started developing a whistling noise somewhere from the rear. when i seat in the driver seat, it's coming from behind my right shoulder, from the back, and about my ear level. i am 6'5''. basically, sounds like upper part of tailgate.
it comes up only at high speeds. sometimes it's 55, always 65 and up. starts with slight hiss then turns into what i can describe as low pitch flute sound. whoooooooooooooo. it is speed relevant, pitch goes higher as speed increases.
it is absolutely annoying.
so far, i had additional seals added to the entire tailgate. rear roof rack removed. had entire tailgate taped around so that no air gets in. tried create positive pressure inside and sprayed soapy water on all doors and tailgate. nothing helps.
i asked my sons several times to locate the sound origin, while driving, they can't. it's somewhere in the back is there response. i tried it myself, and still can't pinpoint where it's coming from.
it's quite loud, actually.
yes, i did have rear diff fluid changed at 65K. it does not sound metallic or crunchy, like bearings. i have no idea.
anyone had this?
unfortunately, i am leaning towards thug's suggestion. antenna is not up, i had entire talegate sealed with ductape, spoiler wouldn't have showed itself only 2 years ago, in 11 years of ownership. and when i had positive pressure created inside, and sprayed all seams with soap water, there was no bubbles coming out on sunroof, or doors.
i'll get it out on hwy again with me in the back. if it's coming from tire well or lower portion, it's bearing. that will be easy to fix. rear diff is filled with Amsoil, i do not believe it went bad on us, besides, we almost never go on 4 or tow. towing was, actually, done only once, and rear diff fluid changed thereafter. also, i saw some other posts referring to bad rear hub bearings on those.
thank you all for suggestions.
it's just that that noise AWFULLY sounds like wind noise. oh well, never a moment without learning something new. i'll try to record it and post here for reference.