Noise in dash

[JeanDouet]

So I have a 2016 GMC Sierra 1500 SLT Premium All Terrain. I have a noise in my dash that is driving me insane. I took pillars down and also cover for speakers and can’t find anything loose. It seems to be deeper than the panel after the speaker panel. It’s rattler noise kinda like when u flick a door stopper and it bounces up and down. Anyone with help towards me fixing this problem would be greatly appreciated. It’s has a 8” lift with 22s on 35s and rides great. Nothing wrong with the truck other than this. Please help

[1SLOW1500]

If you look careful you can see the issue in the first picture. Good luck. [emoji38][emoji38]

Sent from my SM-N960U using Tapatalk

[JeanDouet]

Haha ok now help me out please tell me I don’t have to do all this lol

[Joppy818]

What was your issue. I sent DM,. trying to investigate myself- I think maybe its an actuator on the HVAC box. Or maybe duct tapping on dash carriage?

[NorEaster]

Anyone ever figure this out? I removed the panel by the knee bolster, tightened one screw thinking it would help (it was very loose) ended up still having the rattle. Took the dash trim off closest to the windshield, where the heater vent is and couldn't find anything. Someone has got to have figured this out.

[Joppy818]

On 10/29/2019 at 5:22 PM, NorEaster said:

Anyone ever figure this out? I removed the panel by the knee bolster, tightened one screw thinking it would help (it was very loose) ended up still having the rattle. Took the dash trim off closest to the windshield, where the heater vent is and couldn't find anything. Someone has got to have figured this out.

You need to put flocking tape around the hooks that secure the defrost grill. There is a tsb on that

[NorEaster]

On 11/2/2019 at 11:09 AM, Joppy818 said:

You need to put flocking tape around the hooks that secure the defrost grill. There is a tsb on that

Do you mean on the actual vent that you remove? I put a piece of duct tape on each of those clip/tabs. Still have the rattle.

[Joppy818]

That’s the defroster grill vent. and it’s the only piece you can remove from the dash. By just removing the a pillar. The tabs are part of it, there are also “hooks that when you reinstall will slide into “holes”closest to the windshield. Try wrapping flocking tape around the hooks. That helped my problem. Until I had another rattle, now sounds like I have a loose duct and or evaporator or heater core. Also, you can insulate the cutout for the vent on the underside 

[NorEaster]

8 minutes ago, Joppy818 said:

That’s the defroster grill vent. and it’s the only piece you can remove from the dash. By just removing the a pillar. The tabs are part of it, there are also “hooks that when you reinstall will slide into “holes”closest to the windshield. Try wrapping flocking tape around the hooks. That helped my problem. Until I had another rattle, now sounds like I have a loose duct and or evaporator or heater core. Also, you can insulate the cutout for the vent on the underside 

Seems like this rattle is common. Ive also heard of people having the rattle coming from the AC plug in the little cuby by the cup holders. Ill have to give it another look. I appreciate the help!