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Irritating HVAC noise - Not sure where to start

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Bradtastic View Drop Down
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Joined: 13-Oct-2014
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  Quote Bradtastic Quote  Post ReplyReply Direct Link To This Post Topic: Irritating HVAC noise - Not sure where to start
    Posted: 22-May-2015 at 21:28
I'm hoping someone could tell me if they have experienced this and maybe can point me in the right direction...

When driving, regardless of whether the climatronic is on or not, when I exceed 60-65 mph, I get what sounds like a flapper valve opening and closing. It's kind of like a dull whistle that comes and goes in 2-3 second intervals.

I've noticed that this only happens when recirculate is OFF. If I flip recirculate ON it stops. If HVAC is off, and the noise starts, and I flip it on, and flip recirculate on, then shut HVAC off it goes away and wont come back. (I haven't determined if it doesn't come back until I turn off/on or if it will after some time still running)

It sounds as if it's coming from under the front passenger seat, but with it being speed-related, I'm wondering if it has to do with the cabin air inlet?

Any suggestions on what to look for?

Thanks!
-Brad

04 W8V 6MT
11 Husqvarna TE310
12 Triumph Tiger 800XC
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