Vacuum line behind intake

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Aug 17, 2006 | 10:56 PM

Turbosixx

Thread Starter

Burning Brakes

Joined: May 2006

Posts: 813

Likes: 2

From: Norco La.

Vacuum line behind intake

I'm in the process of changing my heads, cam and intake. While I was taking the passenger side head off I noticed a small plastic vacuum line going inside the big harness bolted to the back of the passenger side head. I did not unplug this line so it must have come disconnected when I was removing the intake, or it wasn't connected to anything. Where does this line go?

Aug 17, 2006 | 11:12 PM

berryj

Drifting

Joined: Mar 2003

Posts: 1,398

Likes: 1

From: Kingsport TN

It may be this line shown in my post here:
http://forums.corvetteforum.com/show....php?t=1472249

I have a piece of rubber tubing attached to it. The stock "straw" is black hard plastic which attaches to the small rubber elbow on the back of your intake manifold. However, I don't know where the other end of that straw goes after it dips behind the engine.

Aug 17, 2006 | 11:17 PM

vette747

Racer

Joined: Jan 2005

Posts: 375

Likes: 0

From: Montreal Drive it like you test it !

This is to open and closed the HVAC AC doors.

Comments in red talk about this hose:

And the other end it connects to:

Aug 17, 2006 | 11:28 PM

Turbosixx

Thread Starter

Burning Brakes

Joined: May 2006

Posts: 813

Likes: 2

From: Norco La.

HA! I didn't notice when I pulled the intake. I would have been mad if the A/C didn't work. You guys rock!

Aug 18, 2006 | 06:05 AM

Blow Torch

Melting Slicks

Joined: Nov 2003

Posts: 3,011

Likes: 9

From: Dublin GA

[QUOTE=vette747]This is to open and closed the HVAC AC doors.

I "extended" mine on both cars (learned from the 1st) with some additional line (approx. 4") so I could hook it up before sliding the manifold back in place. It is a PITA to hook up once the intakle is back!

Aug 18, 2006 | 06:14 AM

vettenuts

Team Owner

Joined: Mar 1999

Posts: 22,025

Likes: 192

From: At the beach in little Rhody

Need small hands, this is where kids and the wife can help

Aug 18, 2006 | 06:28 AM

WKMCD

Race Director

Joined: Dec 2004

Posts: 13,760

Likes: 75

From: Haymarket VA

[QUOTE=BOTTLE FED]

Quote:

Originally Posted by vette747

This is to open and closed the HVAC AC doors.

Extend it....You've been warned!

Aug 19, 2006 | 09:41 AM

Varmit

Team Owner

Joined: Jan 2006

Posts: 20,800

Likes: 59

From: Tellico Village, Tn

St. Jude Donor '08

Will this cause a rough idle if there is a problem with it???

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Aug 19, 2006 | 07:10 PM

VetteTech81

Le Mans Master

Joined: Nov 2002

Posts: 7,179

Likes: 2

From: Charlotte, NC

Quote:

Originally Posted by RamonaC5

Will this cause a rough idle if there is a problem with it???

Meaning if there was a leak in the line or if the line was disconnected... yes very possible... you would have false air entering the intake, meaning air that the PCM can't see through the MAF sensor.... I've see the intake bellows/accordian tube after the maf has a small tear in it and it would cause the car to run rough.. and sometimes the rough condition would come and go supraticly since the tube was flexing...
-=Rick

Aug 19, 2006 | 07:16 PM

#10

cruisemon

Melting Slicks

Joined: May 2000

Posts: 2,498

Likes: 4

From: Brentwood TN

Rough idle is almost certain...

Quote:

Originally Posted by RamonaC5

Will this cause a rough idle if there is a problem with it???

But that is NOTHING compared to language which shall emanate from the passenger compartment upon discovering the AC she's a no work. Some may be able to reach this *^#%@( tube after you put the (*&^#% manifold back on the &%(*^#$ engine but my hands are too (*^&#%^ big to do it.

Charlie

Aug 19, 2006 | 09:35 PM

#11

berryj

Drifting

Joined: Mar 2003

Posts: 1,398

Likes: 1

From: Kingsport TN

I haven't had any problems w/ my extension. I made it just long enough as you can see in my picture via the link above in my post. When I push the manifold into position there is no kinking/leaking. I've had it like this for over 3 months, no problem.

Aug 20, 2006 | 03:23 PM

#12

corvette Mark

Pro

Joined: Jan 2003

Posts: 526

Likes: 0

From: Tampa fl

Quote:

Originally Posted by vette747

This is to open and closed the HVAC AC doors.

Comments in red talk about this hose:

And the other end it connects to:

This information is GOLD for all of us who like to work on our own cars.

Thanks for posting!!!

Aug 20, 2006 | 05:36 PM

#13

vette747

Racer

Joined: Jan 2005

Posts: 375

Likes: 0

From: Montreal Drive it like you test it !

Quote:

Originally Posted by corvette Mark

This information is GOLD for all of us who like to work on our own cars.

Thanks for posting!!!

Glad I could help. If you want some more, I have about 30 DIY on my web site.

http://pages.videotron.com/vette747/

Aug 20, 2006 | 09:31 PM

#14

Bill Curlee

Tech Contributor

Joined: Dec 1999

Posts: 32,910

Likes: 2,396

From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

My 98 had the HVAC quit working and I traced it down to that fitting coming off the intake. Man talk about a pain in the *** to get back on. A mirroe, lond needle nose plires and lots of cursing but I got it back on. YES,,, I added an extension hose!!!

Here are some more pics fr=or your files! Isave them all!!!

Here is the vacuum resivour that it goes to!

Hope that helps!

Bill Curlee

Aug 20, 2006 | 11:48 PM

#15

SpeedyZ

Drifting

Joined: Oct 2004

Posts: 1,384

Likes: 8

From: Southwest Virginia

As other here has said that hose goes to the vacuum reservoir tank in the right fender well. Here is a photo of the tank and hoses, the manifold hose enters at the bottom.

Oct 30, 2024 | 10:23 PM

#16

Littleman55

Intermediate

Joined: May 2024

Posts: 25

Likes: 0

[img alt="Does anyone know how to fix this problem whit my 2003 corvette
"]https://cimg5.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/2000x1504/img_0766_b5a85654619adf2e0746ba05cd5d4ed 35ec32c5e.jpeg[/img]
Does anyone know how to fix this problem whit my 2003 corvette

Oct 31, 2024 | 07:41 AM

#17

lucky131969

Tech Contributor

Joined: Jan 2007

Posts: 19,115

Likes: 1,038

From: Dyer, IN

Quote:

Originally Posted by Littleman55

I believe you are in the running for the thread resurrection award this week......18 years old ! ...........but.....what does your fuel sending unit issue have to do with the intake manifold vacuum hose?

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