Random knocking behind glove box

2002 CHEVROLET SILVERADO
177,000 MILES • 4.8L • V8 • 2WD • AUTOMATIC
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JTCSTMXRDR
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  • 4 POSTS
I have this knocking, not a clicking noise, behind or above my glove box. It happens randomly. When I turn the car on or just when I am driving. It doesn't matter if AC or heater is on it is just a random knocking. Lay fire a couple seconds? I am sure it is an actuator but have no clue for sure. Any help would be great.
Sep 25, 2018 at 6:51 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,628 POSTS
Yes it does sound like a blend door actuator. If the HVAC system is off does the noise still occur? You need to be able to have the car make the noise so you can see where it is coming from. Here is a guide that can help:

https://www.2carpros.com/articles/replace-blend-door-motor

Please let us know what happens.

Cheers, Ken
Sep 27, 2018 at 3:50 AM
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JTCSTMXRDR
  • MEMBER
  • 4 POSTS
Hi Ken,
Ya it happens when the ac, hot air, recirculating air or when everything is off. But I pulled the plug out of what I think is the blend door actuater behind the glovebox and so far no noise. So I think I found my culprit. Well I hope I did. I will keep you posted then I buy a new one. Thanks again Ken.


Jamie T
Sep 27, 2018 at 8:25 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,628 POSTS
Yep, it sounds like you found it. Nice work. Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
Sep 28, 2018 at 4:48 AM
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