Weird WHINING coming from B-Pillar???

[Roggie]

Hey all,

I have a strange one: When it's cold, a very strange oscillating, whining noise comes from the speaker hole in the b-pillar of my 2002 TB. It only happens when it gets cold. The colder it is, the louder it gets, and it seems basically independent of the key's position in the ignition. it goes away once the machine warms up...

SO...ANY ideas? It started doing it at the end of last winter, but once it warmed up, it went away, so I forgot about it. But... now it's back...

 

[STLtrailbSS]

There is an HVAC sensor in there I'm almost positive that's what will be making the noise have never seen the problems of a whine from it. You can just unclip that pillar its easy and investigate it,it does have a rotating part so hopefully its just dusty or something.

 

[Roggie]

There is an HVAC sensor in there I'm almost positive that's what will be making the noise have never seen the problems of a whine from it. You can just unclip that pillar its easy and investigate it,it does have a rotating part so hopefully its just dusty or something.

Great i'll check it out.

Thanks,

 

[The_Roadie]

Yep. It's a tiny squirrel cage fan to suck cabin air past the sensor. Only present in the automatic digital HVAC systems. Seeing the grill, many folks think it's a speaker, or a better guess would be the mike for OnStar. But that's hidden in the overhead console so the speakerphone can hear all the occupants, not just the driver.

 

[Roggie]

Yep. It's a tiny squirrel cage fan to suck cabin air past the sensor. Only present in the automatic digital HVAC systems. Seeing the grill, many folks think it's a speaker, or a better guess would be the mike for OnStar. But that's hidden in the overhead console so the speakerphone can hear all the occupants, not just the driver.

Man, ya learn something everyday, thanks guys.