What’s this sound? Heater A/C related
 

https://twitter.com/biggmoe/status/1...923069955?s=21https://twitter.com/biggmoe/status/1441587117923069955?s=21

1996 Tahoe just started making this sound this morning. It’s coming from the passenger side under dash area. I posted a video on the link above. Initially thought it could be a blend door actuator, but it’s so loud.
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Re: What’s this sound? Heater A/C related
 

Probably a heater vent door actuator (or whatever it is called) thing. Check this thread.

https://67-72chevytrucks.com/vboard/...d.php?t=257463

Thank you, I’ll check it out.
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Re: What’s this sound? Heater A/C related
 

I've heard odd noises coming from that area before in my '95. Not that loud or as repetitive or rapid. I figured it was some issue with a flapper actuator. I never figured it out. I don't think I've heard it in a while but this thread made me think of it.

Re: What’s this sound? Heater A/C related
 

Sounds like the blend door actuator on my Impala when it failed.
The plastic gears strip out and then it sits there and clatters.