Passenger Side Air Vent in Carpet Question
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
Passenger Side Air Vent in Carpet Question
Have my car stripped down doing deadening and new audio system. I've never read anything about this vent doing anything. That it's worthless. Have read it's a Bond 007 sleeping gas dispenser. lol
Does it actually blow air? I've read that no setting on the climate control will actually blow air out of it. Is this true??
I'm asking because I'm thinking to just cap it off and get the tube behind the carpet out of the way so I can lay my Luxury Liner MLV behind it easier. If it's a useless vent, might as well get it out of my way.
As long as I cap it off, anyone see an issue with it?
Does it actually blow air? I've read that no setting on the climate control will actually blow air out of it. Is this true??
I'm asking because I'm thinking to just cap it off and get the tube behind the carpet out of the way so I can lay my Luxury Liner MLV behind it easier. If it's a useless vent, might as well get it out of my way.
As long as I cap it off, anyone see an issue with it?
Racer
Joined: Nov 2006
Posts: 297
Likes: 26
From: San Jose California
Oh Great !
The vent bezel on the right side of the trans hump fell off on my ride home from the dealer. I had more serious problems with the car so I never thought about it until you brought it up. I doubt that Government Motors would have sprung for ducting and a lousy, cheap bezel unless it was supposed to serve some function. But- since nobody misses it, I'd cover it up if I were upgrading my interior.
Safety Car
Joined: Dec 2011
Posts: 4,704
Likes: 239
From: Redondo Beach CA
For the longest time I thought it was an air vent for the gremlins.
Some say.......That it is the location for the audio pick up in the volume compensation circuit . It is a gain following circuit that adjusts the radio volume so you don't get blasted out when the car quiets down, like stopping for a light. Unfortunately, any added circuit will add distortion, so I usually keep this convenience feature at zero gain via the little thin control lever **** under the main volume control. It is a somewhat common convention on a convertible radio, where the sensor is usually mounted on the radio faceplate.
Some say.......That it is the location for the audio pick up in the volume compensation circuit . It is a gain following circuit that adjusts the radio volume so you don't get blasted out when the car quiets down, like stopping for a light. Unfortunately, any added circuit will add distortion, so I usually keep this convenience feature at zero gain via the little thin control lever **** under the main volume control. It is a somewhat common convention on a convertible radio, where the sensor is usually mounted on the radio faceplate.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
It's an air duct. When you pull the carpet there is the vent bezel that attaches to the carpet opening and a 6" or so bent duct that connects to a port up under the dash. It pulls off easy.
Only reason I considered removing and plugging up the tube was because I've never felt any air coming out of it. If the blower fan isn't strong enough to blow air out of that vent, what's the point of it being there? My thought of closing the port is no different than closing one of the dash vents. It blocks the air and just forces more air out of the remaining open vents.
Only reason I considered removing and plugging up the tube was because I've never felt any air coming out of it. If the blower fan isn't strong enough to blow air out of that vent, what's the point of it being there? My thought of closing the port is no different than closing one of the dash vents. It blocks the air and just forces more air out of the remaining open vents.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
There is no external microphone for the "volume" compensation for the C5 which is actually "frequency" compensation. The radio receives input from the serial bus based on speed and throttle position.
None of this is found in the FSM except for there being no external microphone.
In the end, capping that small vent will not have any significant impact on the system air balance.
None of this is found in the FSM except for there being no external microphone.
In the end, capping that small vent will not have any significant impact on the system air balance.
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
There is no external microphone for the "volume" compensation for the C5 which is actually "frequency" compensation. The radio receives input from the serial bus based on speed and throttle position.
None of this is found in the FSM except for there being no external microphone.
In the end, capping that small vent will not have any significant impact on the system air balance.
None of this is found in the FSM except for there being no external microphone.
In the end, capping that small vent will not have any significant impact on the system air balance.
First time I ever heard the "microphone theory" 
I'd have to double check but it may only function in the heat mode.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
If you could, please let me know. My interior is still torn down doing my stereo install. Thanks for the help. As of now, I'm leaving it. But if it does nothing, I'm capping it off.
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Team Owner
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Well, it's definitely tied to the HVAC system. I'll see if I can find anything more specific.
Team Owner
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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
After a FSM review, other than the description on how to R&R the outlet tube, etc, there's no definitive description other than that inferred by its name "floor outlet duct". IOW, I'm not sure if air is discharged in heat (only) mode or bi-level mode or maybe both. Same for AC mode. A lot depends on its physical connection to the actual HVAC module itself, i.e. is it on the heater plenum side or the AC condenser side.
I think you may want to just fire up your engine and turn on the AC/heater and crank the blower up to high, then change modes. Some people tape a small piece of tissue paper over outlets to gauge airflow. Easy enough to do.
I think you may want to just fire up your engine and turn on the AC/heater and crank the blower up to high, then change modes. Some people tape a small piece of tissue paper over outlets to gauge airflow. Easy enough to do.
Team Owner
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From: Dear Karma, I have a list of people you missed.
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Drifting
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From: Iowa
Team Owner
Joined: Jul 2006
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From: Kannapolis NC
Before I say this, a couple of qualifiers:
It makes no difference to the original question.
I have a 2004 convertible.
My car DOES have a vent under the dash behind the left side of the glove box that blows down on the passengers feet in addition to the vent in the tunnel carpet. I don't know if the 04 is different or if a convertible is different, or neither. The OP didn't say the year or body style he's working on.
Either way, if I wanted to block the tunnel vent in question, I would. It doesn't blow enough air to make a difference.
It makes no difference to the original question.
I have a 2004 convertible.
My car DOES have a vent under the dash behind the left side of the glove box that blows down on the passengers feet in addition to the vent in the tunnel carpet. I don't know if the 04 is different or if a convertible is different, or neither. The OP didn't say the year or body style he's working on.
Either way, if I wanted to block the tunnel vent in question, I would. It doesn't blow enough air to make a difference.
Last edited by 65GGvert; Jul 4, 2014 at 11:37 PM.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
There is a foot vent for the passenger as was just mentioned. That one does all the work. The carpet one is useless. I'm leaving it either way as it didn't really get in my way.
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
Have my car stripped down doing deadening and new audio system. I've never read anything about this vent doing anything. That it's worthless. Have read it's a Bond 007 sleeping gas dispenser. LOL
Does it actually blow air? I've read that no setting on the climate control will actually blow air out of it. Is this true??...
Does it actually blow air? I've read that no setting on the climate control will actually blow air out of it. Is this true??...
I really enjoyed reading this book. It's filled with little details like this one
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Last edited by GCG; Jul 5, 2014 at 12:14 PM.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
Hmmm. I have the book here and started reading it and just can't get back to it. Some day.
And I don't have dual climate control. I have the ****** global(single) control. Maybe mine leaks too but I've never felt it.
And I don't have dual climate control. I have the ****** global(single) control. Maybe mine leaks too but I've never felt it.
