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Toyota Highlander Maintenance and Repair

4695 messages,  Last post on Dec 02, 2009 at 7:26 AM

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#1502 of 4695 Re: Noise, vibration & harshness... [wwest] by wain Jul 23, 2004 (5:52 am)
Replying to: wwest (Jul 22, 2004 1:43 pm) cool keep at it "For a very obtuse reason I happen to know that the cabin airflow exhauster port is located just inside that quarter panel just behind the rear bumper "bulge" as it wraps around toward the wheelwell."   where is this? post a pix? more detail? are you saying its like a check valve that flutters? Replies to this message: wwest (Jul 23, 2004 2:19 pm)
#1503 of 4695 Check valve..... by wwest Jul 23, 2004 (9:31 am)
that flutters....   Yes, exactly. There is a light rubber membrane covering the outlet flow, exhauster, port. If the cabin interior air pressure it greater than the atmospheric pressure near this outlet then the membrane will "open". If the atmospheric pressure is equal or above the vehicles cabin pressure the membrane will remain closed due to the force of gravity and/or reverse pressure.   At this point I'm guessing that the distance between the exhauster port opening and the directly facing exterior body panel, maybe 3 to 4 inches, is causing a low frequency resonance which results in an air pressure standing wave and thereby the membrane flutters "open and shut, open and..." at the low frequency you hear with just the rear window(s) down.
#1504 of 4695 Re: Noise, vibration & harshness... [wain] by wwest Jul 23, 2004 (2:19 pm)
Replying to: wain (Jul 23, 2004 5:52 am) Toyota/Lexus cabin air outflow exhauster port oriented as in vehicle such that gravity holds the membrane shut.   Membrane shown removed
#1505 of 4695 by wain Jul 23, 2004 (2:53 pm)
where exactly is it????????????   maybe it needs a hole in it just big enought to soften its closing effect and reduce its effectiveness.
#1507 of 4695 And the results are..... by wwest Jul 23, 2004 (3:21 pm)
Drove home to remove the membrane and on the way home I lowered the right rear window. At 40MPH (max on city streets) the pressure waves were painful on my eardrums. On the way back to the office after removing the membranes the pressure waves were practically non-existant.   Will do more trials at higher speeds over the weekend but it's hard to believe that Toyota and Lexus would screw up this seriously and then simply let it ride for so long.   On the other hand some of the fault for that is likely mine since I have been saying that these pressure waves are somewhat normal historically.   How many of you have actually lodged a complaint with Toyota or Lexus about this?   Since I happen to have a "spare" exhauster port and if the pressure waves persist at higher speeds I may add another exhauster port on the opposite side. After removing the reverse flow blocking membrane, of course.   I know from my experience with the Ford station wagons that it didn't take much of an opening of the rear liftgate glass to completely eliminate the pressure waves.
#1508 of 4695 Where is it... by wwest Jul 23, 2004 (3:26 pm)
On my 01 RX300...   Directly behind the red "street/parking" lamp that's mounted on the rear bumper wraparound "bulge" on the driver's side rear quarter panel. If you put the fan on high and flow on fresh with the vehicle closed up completely you can feel the air outflow behind the rear wheel at the bottom of the driver's side rear quarter panel.   On the RX300 you will also likely hear the fluttering that first called my attention to this.
#1509 of 4695 FYI by wwest Jul 23, 2004 (3:50 pm)
Posted on the Toyota LC and Lexus LX forums.   LC & LX owners, HL and RX owners need your help. Many of these owners have posted complaints about the eardrum busting helicopter noise generated within the vehicle with a single rear window down and clipping along at hwy speeds.   From my own experience I know historically of this problem. My 68 and 72 Ford station wagons were subject to this effect but by simply lowering the rear liftgate glass slightly I could eliminate the effect.   I notice that the LC, and maybe the LX, have cabin airflow exhauster ports which are mounted above the "beltline", one on each side of your vehicles.   Do those exhauster ports and their "high mount" location allow enough cabin air outflow to prevent the helicopter sound in the LC and LX? Or are have you seen the same type of complaint?   For reference read:   Toyota Highlander Owners: Problems and solutions at post 1490 on... Replies to this message: 02hl (Jul 23, 2004 7:28 pm)
#1510 of 4695 Re: FYI [wwest] by 02hl Jul 23, 2004 (7:28 pm)
Replying to: wwest (Jul 23, 2004 3:50 pm) Although I would love to drive with the sunroof wide open, I can deal with the wind noise knowing the car has such an excellent seal throughout. As for your project, you may want to reconsider if you plan on keeping it permanent. Humid conditions could cause musty odors in your vehicle.
#1511 of 4695 what by wain Jul 23, 2004 (7:34 pm)
is the original purpose of these vents.   still ask for a better description of where it is.   1. is it in the wheel well somewhere near the tire? yes no?   2. connected to the vent on the left when you open the rear hatch. there is a vent inside the car which has open slots - on the other (passenger side) the vent looks the same but is sealed up?   3. can you see it from outside the car or do you have to pull the lower fender edge out on the drivers side at the back?

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