Noises coming from the rear or trunk area? It might be this... - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Lightened · 10-06-2018, 08:37 PM

There are (2) ventilation doors that allow air to escape the cabin when the trunk or doors are closed or when the fan, heater or AC are on.

These vent doors are located underneath both sides of the rear bumper behind the rear wheel wells.

Even with the fan off, if fresh air is entering the cabin through the ventilation system or windows... these vent doors are doing their thing.

While driving you may hear them gently open and close... that's what they are designed to do.

It does allow some outside road noise to enter the cabin, especially with an aftermarket exhaust.

They are accessible from inside the trunk or when the rear bumper is removed.

Most cars have them. Video clip a few posts down...

gravitylover · 10-07-2018, 08:04 AM

It would be so great if you're right about this. That noise has been bugging me for year and I haven't been able to figure out what it is. I've searched all over under and around and each time I look I get more annoyed that I can't figure it out. I'm gonna owe you a beer

Tcoat · 10-07-2018, 12:15 PM

Although the principal is the same the actual parts on the Twins are very different from the picture shown. For one it is on the other side of the car and it is much much smaller. The flaps are just a small piece of rubber not a rigid slat that would bounce and rattle. If you are getting a rattle it isn't the vent.

https://www.google.ca/search?q=su003...AHTcG4EtYmg-KM

Tcoat · 10-07-2018, 12:28 PM

Quote:

Originally Posted by Lightened

Thanks... updated original post.

Was worth a shot.

Lightened · 10-07-2018, 01:11 PM

In action on a WRX with an aftermarket exhaust system.

[ame]https://www.youtube.com/watch?v=sDvvB8CHjGc[/ame]

Lightened · 03-12-2020, 04:15 AM

Updated

soundman98 · 03-13-2020, 01:30 AM

i've had some really kicking sound systems, and while i have heard those flaps slightly fluttering outside the car when the sub is pounding, there's absolutely no way to hear it inside the cabin.

tehShirt · 03-13-2020, 08:32 AM

https://static.nhtsa.gov/odi/tsbs/20...40470-9999.pdf

Here is a TSB with the revised part numbers for these. 72651CA001 for the BRZ

They can get stuck open in some cases.

LancePower · 03-13-2020, 08:43 AM

My 2016 FR-S had a highway-speed (ie vibration in the chassis) ticking noise. It was worse in colder weather and seemed to go away when the windows were down.

Dealer tore the whole interior apart trying to find the source. They concluded it was this vent. They replaced it but the ticking never went away. This was likely before this redesigned part was available.

Mine didn't sound like the video above, which is more of a shutter sound. Mine was more of a ticking sound. Like raindrops falls on tin metal.

Boomerang · 03-13-2020, 09:54 AM

check your trunk dude..

10-06-2018, 08:37 PM	#1
Lightened Every Ounce Counts Join Date: Jul 2015 Drives: 86 Location: Earth Posts: 214 Thanks: 165 Thanked 206 Times in 90 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Noises coming from the rear or trunk area? It might be this... There are (2) ventilation doors that allow air to escape the cabin when the trunk or doors are closed or when the fan, heater or AC are on. These vent doors are located underneath both sides of the rear bumper behind the rear wheel wells. Even with the fan off, if fresh air is entering the cabin through the ventilation system or windows... these vent doors are doing their thing. While driving you may hear them gently open and close... that's what they are designed to do. It does allow some outside road noise to enter the cabin, especially with an aftermarket exhaust. They are accessible from inside the trunk or when the rear bumper is removed. Most cars have them. Video clip a few posts down... Last edited by Lightened; 03-14-2020 at 04:11 PM.

10-07-2018, 08:04 AM	#2
gravitylover Senior Member Join Date: Nov 2014 Drives: 2013 BRZ Premium 6MT White Location: SE NY Posts: 1,503 Thanks: 1,218 Thanked 669 Times in 474 Posts Mentioned: 7 Post(s) Tagged: 1 Thread(s)	It would be so great if you're right about this. That noise has been bugging me for year and I haven't been able to figure out what it is. I've searched all over under and around and each time I look I get more annoyed that I can't figure it out. I'm gonna owe you a beer __________________

10-07-2018, 12:15 PM	#3
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,294 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	Although the principal is the same the actual parts on the Twins are very different from the picture shown. For one it is on the other side of the car and it is much much smaller. The flaps are just a small piece of rubber not a rigid slat that would bounce and rattle. If you are getting a rattle it isn't the vent. https://www.google.ca/search?q=su003...AHTcG4EtYmg-KM __________________ Racecar spelled backwards is Racecar, because Racecar.

10-07-2018, 01:11 PM	#5
Lightened Every Ounce Counts Join Date: Jul 2015 Drives: 86 Location: Earth Posts: 214 Thanks: 165 Thanked 206 Times in 90 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	In action on a WRX with an aftermarket exhaust system. [ame]https://www.youtube.com/watch?v=sDvvB8CHjGc[/ame] Last edited by Lightened; 03-09-2020 at 12:38 AM.

03-13-2020, 01:30 AM	#7
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,675 Times in 6,782 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	i've had some really kicking sound systems, and while i have heard those flaps slightly fluttering outside the car when the sub is pounding, there's absolutely no way to hear it inside the cabin. __________________ "The time you enjoy wasting is not wasted time"

03-12-2020, 04:15 AM	#6
Lightened Every Ounce Counts Join Date: Jul 2015 Drives: 86 Location: Earth Posts: 214 Thanks: 165 Thanked 206 Times in 90 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Updated

03-13-2020, 08:43 AM	#9
LancePower Senior Member Join Date: Aug 2016 Drives: 2020 BRZ tS Location: NJ Posts: 513 Thanks: 96 Thanked 192 Times in 119 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	My 2016 FR-S had a highway-speed (ie vibration in the chassis) ticking noise. It was worse in colder weather and seemed to go away when the windows were down. Dealer tore the whole interior apart trying to find the source. They concluded it was this vent. They replaced it but the ticking never went away. This was likely before this redesigned part was available. Mine didn't sound like the video above, which is more of a shutter sound. Mine was more of a ticking sound. Like raindrops falls on tin metal.

03-13-2020, 09:54 AM	#10
Boomerang 86 Join Date: May 2016 Drives: 2015 Toyota GT86 MT UEL E85 RSR CWP Location: Perth, Western Australia Posts: 3,293 Thanks: 3,553 Thanked 4,850 Times in 2,166 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	check your trunk dude..

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