vacuum lines ? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-26-2005, 10:03 AM
Registered User
 
Join Date: Jun 2005
Location: ALABAMA
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
vacuum lines ?

I just recently dropped a 350 in a 78 Grand Prix and got rid of all the emissions hoses but there is a black ball like canister that has two small vacuum lines one is purple and the other is black coming from it I believe they control the heater and are ac operations. I not sure what to do with them now. There is no place to hook them up to. Hopefully someone can help me out on this .Thanks in advance.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-26-2005, 11:36 AM
rbfpezcore's Avatar
Not fast, but loud as hell
 
Last photo:
Join Date: Oct 2003
Location: md
Age: 29
Posts: 142
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Not sure what the lines go to, find a shop manual. But the big black ball like thing is your vacuum storage tank I believe. Do you have power locks or a power trunk? Those are likely candidates.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-26-2005, 11:44 AM
bet on black's Avatar
hotrodder 4 life
 
Last photo:
Join Date: Oct 2004
Location: houston, tx
Age: 33
Posts: 169
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
it is probably a vacuum resivior to keep the hvac working normally when the engine is operating under low/no vacuum.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-26-2005, 11:57 AM
Jmark's Avatar
Registered User
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 61
Posts: 4,925
Wiki Edits: 0

Thanks: 13
Thanked 47 Times in 36 Posts
It needs to be hooked up if you are going to use the a/c or heater. The black hose goes to any "manifold" vacuum source. The purple hose is most likely a small plastic line with a rubber end. It goes to the vacuum selector on the dash to control the vacuum motors for the a/c and heater functions.

Mark
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-01-2005, 04:16 PM
New Member
 
Join Date: Jul 2005
Location: florida
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ac/heat

what exactly does the purple line do.and the black?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-01-2005, 06:17 PM
Jmark's Avatar
Registered User
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 61
Posts: 4,925
Wiki Edits: 0

Thanks: 13
Thanked 47 Times in 36 Posts
The larger black hose provides vacuum to the "black ball" canister. Its actually a vacuum storage tank. The hard plastic purple line provides a vacuum signal to the dash selector that controls the a/c, heater and defroster doors under the dash.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-02-2005, 03:27 PM
New Member
 
Join Date: Jul 2005
Location: florida
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
i capped of my heater hoses ,its been running hot .now it runs cooler .is there a control that turns off the heater hose?87 cutlass.i may have forgot some thing during reassembly.i live in florida .it ran over 210 .cap the heater hoses its much better.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 08-02-2005, 04:56 PM
Jmark's Avatar
Registered User
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 61
Posts: 4,925
Wiki Edits: 0

Thanks: 13
Thanked 47 Times in 36 Posts
Blocking off the heater hoses should have no affect on the systems ability to cool off the engine. Sometimes its quite the opposite. The heater core is just a miniture radiator. Turn on the fan and it will pull more heat from the system.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 08-02-2005, 05:20 PM
Henry Highrise's Avatar
Lost in the 60's
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Dec 2001
Location: Dixieland
Age: 69
Posts: 15,189
Wiki Edits: 4

Thanks: 0
Thanked 11 Times in 10 Posts
Jmark is exactly right, that controls the flapper doors in your heat and air ducts. Without that being hooked up your A/c , heat, and defrost will not work right. Your heater hoses should have no effect on your engine temp. A lot of vehicles have a cable operated valve in one of the heater hoses to cut off the water flow to the heater corewhen you turn your heater off. I do not know if yours is like that or not.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 08-02-2005, 06:37 PM
New Member
 
Join Date: Jul 2005
Location: florida
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
if you think about it .water goes out of the intake through the heater core back into the engine .with out ever going through the radiator.in florida the ac is chronically on.heater core is doing no cooling either.so the water from the radiator mixes with with heater water .heats the radiator water back up . making it run hotter .caping it off worked for me.10 degrees. i think it sounds logical to , and it was worth a try.has any one else ever done this?
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 08-02-2005, 06:41 PM
New Member
 
Join Date: Jul 2005
Location: florida
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
my out put heater hose goes into the passenger side top of the radiator .not the water pump.89 chevy serpentine drive set up .
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 08-02-2005, 07:30 PM
Jmark's Avatar
Registered User
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 61
Posts: 4,925
Wiki Edits: 0

Thanks: 13
Thanked 47 Times in 36 Posts
I have thought about it and stand by my earlier post. Blocking off the heater hoses should not affect the engine temp at all.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 08-02-2005, 07:41 PM
Henry Highrise's Avatar
Lost in the 60's
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Dec 2001
Location: Dixieland
Age: 69
Posts: 15,189
Wiki Edits: 4

Thanks: 0
Thanked 11 Times in 10 Posts
I agree with Jmark plugging the heater hoses should have no effect on the engine temp. If the heating system is working properly you shut the water flow to the heater core off when you turn the heater off. If the heater core was helping to cool the engine as some of you suggest, I think you would be very hot in the car.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 08-02-2005, 07:49 PM
New Member
 
Join Date: Jul 2005
Location: florida
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
i did put water wetter in it to .i forgot to mention,but a percentage of water comes out of the heater .mixes wit cooled water from the radiator .that would heat the water back up.cut it off the only water going into the engine is radiator water not mixed with hot heater water .it worked .or that watter wetter REALLY does work .if it works that good,im impressed.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 08-02-2005, 07:52 PM
Henry Highrise's Avatar
Lost in the 60's
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Dec 2001
Location: Dixieland
Age: 69
Posts: 15,189
Wiki Edits: 4

Thanks: 0
Thanked 11 Times in 10 Posts
Good water wetter can make as much as a 10 degree difference.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last 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 for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Vacuum advance hooked up directly to manifold....is this bad????? Steve-0321 Engine 69 03-10-2014 06:10 PM
Distributor Tuning and Theory - Part 1 Rick WI Engine 35 04-26-2011 01:38 AM
Port or Full time vacuum cool rockin daddy Engine 129 10-05-2010 04:00 PM
Vacuum adv.. underdog305 Engine 58 01-30-2007 12:19 PM
vacuum advance help batman09 Engine 14 09-09-2004 10:42 PM


All times are GMT -6. The time now is 06:29 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.