1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Truck Cab Rear Pressure Vent *Research Experiment

Discussion in '2nd Gen. Tacomas (2005-2015)' started by csuviper, Nov 23, 2010.

  1. Nov 23, 2010 at 8:02 AM
    #1
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    I discovered a large vent in the rear of the cab this weekend when I pulled apart the rear seats in my 07 access cab. I didnt think anything of it until I drove down the streat with the seats off. The vent kept popping open which resulted in road and wind noise. I know now that this vent is what I have been very annoyed by ever since I got my truck. Several times I had my wife searching the side and rear windows for leaks.

    Yesterday I decieded to see what would happen if I taped it up so that I could reduce the road and wind noise. I applied a light layer of masking tape to the top of it. I made sure that there were no gaps and that it stuck to all sides.

    I know what you are thinking, I kinda thought the same. This vent eliviates pressure in the cab especially when closing the doors or when the AC/heat is on. The air needs to go somewhere right. I was event told that if you plug up the vent then your ears will explode when you shut the door because of the pressure. Well it was my thinking that there are enough holes and gaps throughout the cab to account for this without having a large vent.Besides it seamed like my vent was defective because it just opened up randomly when driving down the street.

    Results - Test 1
    I did not notice a difference when shutting the door, opening the window or turning on the heat. The windows didn't fog up (and it was a cold one this morning). The fans were not struggling to push air (was not on recirculate). My ears did not explode.

    What I did notice is highly reduced road and wind noise.

    At first impression I am very pleased with the plugged up version. I will continue to test this out as I have a couple more days to install new speakers and Raammat sound deadener. I will add a couple layers of tape and make sure it is fully sealed.
    I might do a second test of just pushing some porus foam down in the vents to still allow air to flow but reduce the velocity and the noise.

    I hope that this test helps out someone that is annoyed by the wind and road noise or sparks some discussion.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    Results - Test 2
    I taped up the vent with double the amount that was already on it. I made sure that there were no gaps at all. This time I did experience a pressured cab. The AC/Heat fan speed was reduced by almost half. The second I turned on the AC/Heat I could feel the pressure in my ears. Shutting the door still was no problem though. The windows did not fog up either. I did not test the windows being open to see how much inflow there was but I will try to do that on my way home from work today.

    In general the road noise was reduced in half and the the wind noise was almost eliminated after plugging up the vent. From the vent there was no noise at all.

    Next test will be to push some foam down in the vent. My thought on this would be that it will reduce the noise but still allow some flow of air. If this holds true then the AC/Heat should run full speed.
    I am also considering a way to hold the rubber flap down unless there is higher pressure in the cab. As I mentioned before with the AC/Heat off and windows closed the flap opened up randomly down the street and stayed upen for most of the time. The pressure in the cab should not have been changing much at all. Actually when I felt the vent when this occured it almost seemed like the air was being driven into the cab, not out of the cab. I was thinking about a rubber band or a some double sided tape. Any other ideas?



    Results - Test 3
    I inserted some foam pieces into the vent. The foam eliviated the higher pressure in the cab. The AC/Heat felt the same as when I opened the window, no flow restriction. The road/wind noise increased however. I could hear times when driving down the road that the vent would open up. It was muffled from the standard but still not perfect. I have driven this way for a couple days so this might be what I settle with in the end. I have one more thing to try... adding weight to the flaps from the inside to see if I can keep the flaps from opening unless the pressure in the cab exceds the weight I add.

    [​IMG]

    [​IMG]


    You can see the thin rubber flap that separates the inside and outside of the cab in the following two pictures (looking down into the vent).

    [​IMG]

    [​IMG]
     
  2. Nov 23, 2010 at 8:06 AM
    #2
    island808

    island808 Me l've got brains.

    Joined:
    Oct 9, 2010
    Member:
    #44414
    Messages:
    1,892
    Gender:
    Male
    First Name:
    Jedediah
    hawaii
    Vehicle:
    '10 6speed 4x4 access cab
    I've never noticed a road noise or air rush.
    I wonder if they don't have it in the 10. As when I turn on fresh air after being on recirculate.. it does "hurt" my ears.

    I would guess that's the door closing, no window crack vent?
     
  3. Nov 23, 2010 at 8:12 AM
    #3
    Andrew H

    Andrew H What is this "search" you speak of?

    Joined:
    Nov 6, 2008
    Member:
    #10545
    Messages:
    4,281
    Gender:
    Male
    Dirty Tucson
    Vehicle:
    2010DCSB4X4TRDORMGM
    See build thread.
    i think i hear air coming in through my driver side front door/window. maybe it is this though. are these on the 2010s? looks like a pita to get to though.
     
  4. Nov 23, 2010 at 8:25 AM
    #4
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    If you want to see if you have it or not, look between the cab and the bed of the truck. There will be a little box extruding out centered just below the rear window. Have someone shut the door while looking at this box. A flap should open. The problem is that the flap just randomly opens when driving down the street.
     
  5. Nov 23, 2010 at 8:32 AM
    #5
    chilidogrc

    chilidogrc Play stupid games, win stupid prizes

    Joined:
    Aug 22, 2009
    Member:
    #21561
    Messages:
    2,515
    Gender:
    Male
    First Name:
    Rodrigo
    San Diego
    Vehicle:
    05 AC Sport 4x4
    King RR Coilovers, FM 40, Allpro rear bumper, OME Dakar leafs, rear 5100's, Snugtop Rebel shell, Treadwright tires, Allpro apex front plate bumper, triple hella 700's, Blacked out headlights, CF hood, weathertech floor mats
  6. Nov 23, 2010 at 3:08 PM
    #6
    shook0002

    shook0002 "The Fuzz"

    Joined:
    May 29, 2008
    Member:
    #6957
    Messages:
    223
    Gender:
    Male
    First Name:
    Joe
    Philly
    Vehicle:
    '08 Doublecab 4X4 SR5
    Do you see a reduction in air coming from the vents when the fan in on high in fresh air mode?
     
  7. Nov 23, 2010 at 3:24 PM
    #7
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    I did not feel or hear any reduction in the air coming from the vents when the fan is on high in fresh air mode. I tested the difference of window closed and window open while the vent was taped up.
     
  8. Nov 23, 2010 at 11:28 PM
    #8
    chacotaco

    chacotaco Well-Known Member

    Joined:
    Aug 21, 2010
    Member:
    #42043
    Messages:
    166
    Gender:
    Male
    First Name:
    Travis
    Albuquerque & Palo Alto
    Vehicle:
    2011 SSM TRD SPORT DCLB
    Black Snugtop XtraVision Sleep Deck.
    I am curious if that vent is for flow-through ventilation, to keep you from passing out in the event there is exhaust leaking into the cab.
    (Happened to me in a ~92 Suburban). I know this has been discussed before, (over at TNation)
     
  9. Nov 23, 2010 at 11:43 PM
    #9
    jdkeller

    jdkeller How many words can be fit in this s

    Joined:
    Nov 26, 2008
    Member:
    #11040
    Messages:
    12,983
    Gender:
    Male
    First Name:
    Jonathan
    Inland Empire, Ca
    Vehicle:
    2008 Tacoma Prerunner TRD Offroad
    Dome light LED, 6000k HID Headlights and fogs, Grillcraft black mesh, rear 5100's, Total Chaos UCA's, 285/75/16 BFG KM2's, Spidertrax spacers, Blacked out emblems, cb,kenwood tm270 ham radio, All Pro 3" leaf pack, Fox 2.0 coilovers, Revenge Fab Sliders, u bolt flip kit, Pioneer avh4200, bed bar with light and antenna, Wet Okoles, Weathertech Mats, Wet Okole Armrests, Rear KR Fab bumper, bed mat, N-Fab spare tire carrier with full size spare on 16" TRD rim, Bedlinered flares and grille. Camburg Spindles, All Pro front fenders.
    I thought I remember hearing someone say it's for when the airbags go off. To get rid of the pressure.
     
  10. Nov 24, 2010 at 7:30 AM
    #10
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    Results - Day 2
    I taped up the vent with double the amount that was already on it. I made sure that there were no gaps at all. This time I did experience a pressured cab. The AC/Heat fan speed was reduced by almost half. The second I turned on the AC/Heat I could feel the pressure in my ears. Shutting the door still was no problem though. The windows did not fog up either. I did not test the windows being open to see how much inflow there was but I will try to do that on my way home from work today.

    In general the road noise was reduced in half and the the air rushing noise was almost eliminated after plugging up the vent. From the vent there was no noise at all.

    Next test will be to push some foam down in the vent. My thought on this would be that it will reduce the noise but still allow some flow of air. If this holds true then the AC/Heat should run full speed.
    I am also considering a way to hold the rubber flap down unless there is higher pressure in the cab. As I mentioned before with the AC/Heat off and windows closed the flap opened up randomly down the street and stayed upen for most of the time. The pressure in the cab should not have been changing much at all. Actually when I felt the vent when this occured it almost seemed like the air was being driven into the cab, not out of the cab. I was thinking about a rubber band or a some double sided tape. Any other ideas?
     
  11. Nov 24, 2010 at 8:59 AM
    #11
    dirtfondler

    dirtfondler Well-Known Member

    Joined:
    Nov 5, 2010
    Member:
    #45762
    Messages:
    240
    Gender:
    Male
    San Jose, CA
    Vehicle:
    00 F250 7.3L Diesel
    Add a stick on wheel weight or two to the flap itself.
     
  12. Nov 24, 2010 at 9:00 AM
    #12
    yosh2000

    yosh2000 Well-Known Member

    Joined:
    Sep 18, 2007
    Member:
    #2733
    Messages:
    2,925
    Gender:
    Male
    Denver, CO
    Vehicle:
    '05 4runner SR5 v8
    i had to drive my truck like this for a day when i was deadening my truck.

    i DID notice a difference of airflow when i blocked this port. it does not make sense that you would NOT notice a difference. the cab has a certain pressure and is sealed for the most part. that little blower fan can only put out a certain pressure. if the cab was sealed, that little blower fan cannot pressurize the cabin, therefore it needs a bleed off (the rear vent)
     
  13. Nov 24, 2010 at 9:14 AM
    #13
    05Moose

    05Moose Middle-Aged Member

    Joined:
    Jan 18, 2010
    Member:
    #29613
    Messages:
    2,535
    Gender:
    Male
    First Name:
    Jim
    In the snow (NorCal)
    Vehicle:
    '05 4x4 DC LB SR5 #8 (LSD, Tow Pkg)
    '05 4x4 DC LB SR5 (LSD & Tow Pkg), Timbrens, AAL, 5100s (.85), Owned: 12/3/04 Mods: Fog, Map/Dome Light, Illuminated 4wd Switch, Washable Cabin Air Filter
    You know, I knew the flap was there from previous posts. And I was curious because you said you can hear noises through yours, but I can't. So when you mentioned having someone shut the door while you watch between the bed and the cab...well, I don't see mine flapping open. I wonder if yours is just deformed and not staying shut all the time like it should?
     
  14. Nov 24, 2010 at 10:06 AM
    #14
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    Hmm, I dont know. The noise coming from this vent is so annoying that it drove me to do this experiment. It is possible that the flap on mine is defective in some way.
     
  15. Nov 24, 2010 at 10:08 AM
    #15
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    This is definately a good idea. I dont have the wheel weights though but I could try adding weight in some way to hold it down. Might be difficult reaching down between the cab and the bed.
     
  16. Nov 24, 2010 at 10:20 AM
    #16
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more

    So you kept your closed up huh. Like you said, I hope that you dont find your closed up vent an issue after reading this. I am hoping to come up with the best solution with my experimentation.
     
  17. Nov 30, 2010 at 12:20 PM
    #17
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    05Moose: I tried the shutting of the door and found out that I dont see it flapping open either. I looked and felt the thin rubber flaps in the vent that separate separates the inside and outside of the cab and found that they dont open up far enough to see from the side of the truck.

    [​IMG]

    [​IMG]
     
  18. Nov 30, 2010 at 12:28 PM
    #18
    csuviper

    csuviper [OP] Moderator Moderator

    Joined:
    Jan 9, 2009
    Member:
    #12424
    Messages:
    4,322
    Gender:
    Male
    First Name:
    Brian
    Broomfield, CO
    Vehicle:
    2012 Tundra Rock Warrior 5.7L 4x4
    3" Toytec Ultimate Lift, 315/70R17 Duratracs, RW Wheels, Grillcraft Grill, Toyota "Raptor" Lettering and more
    See post 1 for updated results (3)
     
  19. Nov 30, 2010 at 7:21 PM
    #19
    TRDSport10

    TRDSport10 Well-Known Member

    Joined:
    Sep 26, 2010
    Member:
    #43839
    Messages:
    78
    Gender:
    Male
    First Name:
    John
    Rhode Island & Virginia
    Vehicle:
    '10 AC TRD Sport 4x4 - Silver
    TRD Exhaust, Tube Steps, Towing Hitch, Paint Protection Film, Bed Mat, Wheel Locks, Spare Tire Lock, First Aid Kit, Ashtray Cup, TRD Air Filter, TRD Oil Cap, TRD Radiator Cap, FJ TRD Hub Caps, FJ TRD Shift Knob, BackFlip F1, TSB Rear Springs, Coupe TRD Battery Hold Down Bar, KatzKin Leather Seats with W.E.T. Seat Heaters, WeatherTech: FloorLiners DigitalFit, Side Window Deflectors, ClearCover License, LampGard
    Brian,

    Thanks for posting and describing your experiments with road /wind noise. My new 2010 Taco AC with 1200 miles on it seems to have the exact same problem from day one that you describe. In my Taco, sitting in a parking lot, engine off and emergency brake on, even a light breeze the wind noise sounds like a hurricane thru the back of the cab, maybe exaggerating a bit, but it is annoying. Drove with a buddy to lunch the other day and we both tried to figure out what was causing the wind/air rush buffeting noise without determining anything except it sounds like a stiff breeze coming thru the inside of the cab. Even driving the truck say at part throttle 2K RPM, with TRD Exhaust talking on windy day, the buffeting wind noise is quite evident and annoying. Time to take her back to the dealer and tell them to confirm and fix the cause of the problem - replace the cabin vent or whatever that flapper device is called if necessary! Being new, only a couple months out of the dealership and having a subwoofer in the middle of the back of the cab, don’t think I want to dive into it.

    Good luck and looking forward to hearing how you eliminate the wind noise in your Tacoma.

    TRDSport10
     
  20. Dec 11, 2010 at 6:00 AM
    #20
    Toyo_Jet

    Toyo_Jet Well-Known Member

    Joined:
    Nov 26, 2009
    Member:
    #26544
    Messages:
    51
    Gender:
    Male
    First Name:
    Shane
    Flatlands of Indiana
    Vehicle:
    10 4X4 V6 SR5 access Cab
    Thanks for posting. This explains the wind noise I have been hearing. I recently upgraded from a 2010 Std cab, to a 2010 Access Cab. I never noticed this noise or the vent on the Std cab. I wander how they vent the Std. cab? As soon as I drove the Access cab, I thought the seals were bad on the rear doors. I'll be looking at mine this weekend. Other than the wind noise I love this truck. Although I do get a lot of dirty looks since I live about 5 miles from a GM truck plant.
     
To Top