Vacuum line question - Chevelle Tech
Chevelle Tech General Tech Area
Please try and post in specific forums

 6Likes
  • 1 Post By JChilders
  • 2 Post By OO52
  • 1 Post By HKalin
  • 2 Post By 72soft-top
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 8 (permalink) Old Oct 16th, 19, 8:48 AM Thread Starter
Dillon
 
Join Date: Sep 2019
Location: Battle Ground, Indiana
Posts: 22
Vacuum line question

I replaced my stock intake manifold on 71 Malibu and while doing so I found a vacuum line that connects to the intake and then disappears into passenger side upper fire wall. Do you guys know what it is for? If you follow the line in the picture behind the plug wires you can see where it goes into fire wall. It connects into a dual fitting at the intake, one goes to transmission but not sure on this one. I want to make sure this one is actually connect somewhere so I don’t have a vacuum leak.
Attached Thumbnails
Click image for larger version

Name:	860020E8-351B-4EE9-878C-676E6A667B7B_1571226350992.jpg
Views:	23
Size:	71.1 KB
ID:	605584  
D16136 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Oct 16th, 19, 9:17 AM
Lifetime Premium Member
Jon
 
Join Date: Jun 2006
Location: West Chester, Pa
Posts: 1,519
Garage
Re: Vacuum line question

Is it an AC car? If so it is probably the vacuum line that controls the heat/AC
LeoP likes this.

1972 Chevelle SS 454 "W" code
JChilders is offline  
post #3 of 8 (permalink) Old Oct 16th, 19, 11:00 AM Thread Starter
Dillon
 
Join Date: Sep 2019
Location: Battle Ground, Indiana
Posts: 22
It is an ac car, but does not work. I plan to remove the compressor and may purchase all new ac parts in the future. For the time being I may just unhook and plug the port.
D16136 is offline  
 
post #4 of 8 (permalink) Old Oct 16th, 19, 11:24 AM
Lifetime Premium Member
Ed
 
Join Date: Nov 2012
Location: San Diego
Posts: 947
Garage
Re: Vacuum line question

That line also controls your heater and defroster. The A/C cars use vacuum to switch from A/C to heat to defrost. Heater only cars use cables.
71350SS and LeoP like this.

Ed

70 El Camino SS 396
68 GTO (Thanks Mom)
06 Silverado
07 SRX
OO52 is offline  
post #5 of 8 (permalink) Old Oct 16th, 19, 11:30 AM
Senior Tech Team
Hank
 
Join Date: Feb 2006
Location: Connecticut
Posts: 6,720
Garage
Re: Vacuum line question

The line that goes thru the firewall should only be about the same size as the hose running to the distributor vacuum advance canister. After it goes thru the firewall it should hook up to the heater, A/C vacuum controller.
71350SS likes this.

71 Malibu, Cottonwood Green, 396 BBC, AutoGear M22W 4 speed, 12 bolt 3:55 posi.
HKalin is offline  
post #6 of 8 (permalink) Old Oct 16th, 19, 2:37 PM Thread Starter
Dillon
 
Join Date: Sep 2019
Location: Battle Ground, Indiana
Posts: 22
Thanks! Guess I will leave it then. Should I be able to see from under dash? My blower does not work. I need to investigate if power issue or bad motor.
D16136 is offline  
post #7 of 8 (permalink) Old Oct 16th, 19, 5:22 PM
Lifetime Premium Member
 
Join Date: Jul 2000
Location: In the Shadow of GIANTS stadium,N.J.
Posts: 7,634
Garage
Re: Vacuum line question

That vacuum line is needed to switch between heat-defrost- but doesn't affect the blower operation.

John
71 El Camino SS
406 SBC M21 3.31 12 bolt
"Quality is always remembered,long after the price is forgotten"
71350SS is offline  
post #8 of 8 (permalink) Old Oct 16th, 19, 5:57 PM
Lifetime Premium Member
Brian
 
Join Date: Apr 2000
Location: Holland, PA
Posts: 1,208
Here’s some info I found on a previous search
Attached Thumbnails
Click image for larger version

Name:	0EABE21A-7DA0-4A22-A679-E2BFBC636133_1571259417844.jpeg
Views:	10
Size:	44.5 KB
ID:	605632   Click image for larger version

Name:	35886B4A-3E4C-43A1-8FFD-FEA9B7B1DB89_1571259428868.jpeg
Views:	11
Size:	56.6 KB
ID:	605634   Click image for larger version

Name:	48EE4722-CF63-43F5-8786-762815BF215F_1571259443584.jpeg
Views:	9
Size:	78.2 KB
ID:	605636  
71350SS and LeoP like this.

Team Chevelle Member (19 years and counting...
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
)

'72 Chevelle Convertible (Mohave Gold) (all SS options, no SS badging)
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


2004 Pontiac GTO (Quicksilver) RIP April 2013
--> Replaced with 2004 Pontiac GTO (Barbados Blue)

2003 Chevrolet Avalanche (Sunset Orange Metallic)
72soft-top is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome