Block off heater hose ? - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Block off heater hose ?

Reply
 
 
 
Thread Tools Search this Thread
Old 07-03-2012, 09:10 PM   #1
Mod75
CF Senior Member
Thread Starter
 
Mod75's Avatar
 
Member Since: Jan 2007
Location: Danville Illinois
Posts: 4,139
Thanks: 0
Thanked 5 Times in 5 Posts
Default Block off heater hose ?

How many of you block off the heater hose to the heater?
Thinking of doing this on my 75 to reduce the heat.

Block off inlet or exit? Pros/cons.

Any pics welcome.
Mod75 is offline   Reply With Quote
Old 07-03-2012, 09:23 PM   #2
annicorvette
CF Senior Member
 
annicorvette's Avatar
 
Member Since: Dec 2006
Location: biloxi mississippi
Posts: 105
Thanks: 0
Thanked 0 Times in 0 Posts
Default

i have the hose (2) bocked off on my 78. in deep south MS we dont need heat much. but went to lowes and purcased 2 in line shutoff valves cut the hose,clamped in the shutoffs and if i need the heat i pop the hood switch the valves and instant heat. used the heat last fall at Mid America would also suggest if ou use this method to ever so often open the valves to circulate new fluid through the heater core (makes the core last longer)
annicorvette is offline   Reply With Quote
Old 07-03-2012, 09:47 PM   #3
sstopczy
CF Senior Member
NCM Sinkhole Donor
 
sstopczy's Avatar
 
Member Since: Jul 2009
Location: South Bend IN
Posts: 309
Thanked 0 Times in 0 Posts
Default

I just put a shut-off valve on the inlet hose a few weeks ago and it has greatly reduced the heat at my feet. At $5 it is probably the best bang for my buck so far
sstopczy is online now   Reply With Quote
Old 07-03-2012, 09:58 PM   #4
Peterbuilt
CF Senior Member
 
Peterbuilt's Avatar
 
Member Since: Aug 2006
Location: mount holly NC
Posts: 4,171
Thanked 108 Times in 97 Posts
Default

A shut off valve helps a lot. I used a ball valve.
Peterbuilt is offline   Reply With Quote
Old 07-03-2012, 11:35 PM   #5
sstopczy
CF Senior Member
NCM Sinkhole Donor
 
sstopczy's Avatar
 
Member Since: Jul 2009
Location: South Bend IN
Posts: 309
Thanked 0 Times in 0 Posts
Default

I just put a shut-off valve on the inlet hose a few weeks ago and it has greatly reduced the heat at my feet. At $5 it is probably the best bang for my buck so far
sstopczy is online now   Reply With Quote
Old 07-04-2012, 12:02 AM   #6
LastC3AZ
CF Senior Member
 
LastC3AZ's Avatar
 
Member Since: Mar 2009
Location: Mesa AZ
Posts: 374
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I just pulled the hoses from the heater core .... capped the water pump and the intake .... called it a day ........ no more cabin heat !@!!
LastC3AZ is offline   Reply With Quote
Old 07-04-2012, 06:47 AM   #7
superdave269
CF Senior Member
 
Member Since: Feb 2012
Posts: 590
Thanks: 0
Thanked 1 Time in 1 Post
Default

I put 2 inline ball valves from Home Depot in my 79. It worked so well I can't believe that I didn't do this 15 yrs ago. I plan on by passing the heater core on my 73 in a week or two because now that its on the road I can feel the cabin heat even with the top down.
Quote:
I have found it's better to block both hoses. One thing I like about this is if I need heat(not that I ever drive it in the winter) all I have to do is open up the valves and in the mean time no more burnt feet.

I also like the suggestion that is directly above mine. If the fitting would come out of my water pump and intake on my 73 I would just put in pipe plugs. I bet I would brake them since they have been in there for 39 years.

Last edited by superdave269; 07-04-2012 at 06:54 AM.
superdave269 is offline   Reply With Quote
Old 07-04-2012, 07:04 AM   #8
Mooser
72 BB Coupe
Support Corvetteforum!
 
Mooser's Avatar
 
Member Since: Apr 2011
Location: 324 miles West South West of Paul74 Ontario
Posts: 4,079
Thanked 128 Times in 108 Posts
Default

Added a valve this year. Just did the one line but it made a significant difference in heat.
I tucked it in as tight as I could to the firewall
You can kind of see it here


Mooser
Mooser is offline   Reply With Quote
Old 07-04-2012, 07:09 AM   #9
mk's78
CF Senior Member
 
Member Since: May 2011
Location: Dover Delaware
Posts: 270
Thanked 3 Times in 3 Posts
Default

did both a few summers ago in my 78 and it does work......

mk's78
mk's78 is offline   Reply With Quote
Old 07-04-2012, 07:19 AM   #10
mds3013
CF Senior Member
 
mds3013's Avatar
 
Member Since: Mar 2009
Posts: 3,101
Thanks: 0
Thanked 2 Times in 2 Posts
Default

Block off the inlet with this valve. From Four Seasons. Has 5/8 connections. And yes my hose clamps are properly dated.



I recently replaced the original vacuum operated shut off valve so this manual valve may not be needed any more. I plan to test it here shortly. The factory set up will work if the vacuum system on the climate control system is working properly. mike..
mds3013 is offline   Reply With Quote
Old 07-04-2012, 10:59 AM   #11
C3batmobile
Junior Member
 
Member Since: Nov 2010
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I put a valve on my inlet hose this spring. It makes a difference. I have opened it up during brief 'cold snaps' or for defogging after rainstorms. So far no problems. I hope to drive her enough in cooler fall weather to keep the (new) heater core in good shape.
C3batmobile is offline   Reply With Quote
Old 07-07-2012, 11:42 PM   #12
scf100
CF Senior Member
 
scf100's Avatar
 
Member Since: May 2012
Location: North Georgia
Posts: 244
Thanks: 0
Thanked 0 Times in 0 Posts
Default

dumb question.......on a 74 BB engine which hose should I add the valve to?..

intake hose or waterpump?
scf100 is offline   Reply With Quote
Old 07-08-2012, 09:10 AM   #13
scf100
CF Senior Member
 
scf100's Avatar
 
Member Since: May 2012
Location: North Georgia
Posts: 244
Thanks: 0
Thanked 0 Times in 0 Posts
Default

ttt
scf100 is offline   Reply With Quote
Old 07-08-2012, 09:42 AM   #14
mds3013
CF Senior Member
 
mds3013's Avatar
 
Member Since: Mar 2009
Posts: 3,101
Thanks: 0
Thanked 2 Times in 2 Posts
Default

From the intake is the supply to the heater core. Think about the flow through the radiator. The thermostat allows the water to flow into the rad.. The water pump pulls the water into itself then pushes it through the block and out the heads into the intake. mike...
mds3013 is offline   Reply With Quote
Old 07-08-2012, 11:46 AM   #15
7t9l82
CF Senior Member
 
7t9l82's Avatar
 
Member Since: Oct 2010
Location: melbourne florida
Posts: 4,148
Thanked 29 Times in 29 Posts
Default

it is unnecessary to block both hoses with a valve. only one is needed and it makes no difference which one.
7t9l82 is offline   Reply With Quote
Old 07-08-2012, 11:57 AM   #16
Richard Cooper
CF Senior Member
 
Richard Cooper's Avatar
 
Member Since: Feb 1999
Location: New Paltz, New York USA
Posts: 2,291
Thanks: 0
Thanked 4 Times in 4 Posts
Default

I removed both hoses two weeks ago on my 81. Had a small drip from the heater core, NEVER used the heater or defroster in 15 years!
Richard Cooper is offline   Reply With Quote
Old 07-08-2012, 12:29 PM   #17
69 Chevy
CF Senior Member
 
Member Since: Aug 2008
Location: Lehigh county Pennsylvania
Posts: 2,200
Thanks: 0
Thanked 1 Time in 1 Post
Default

I installed a McMaster-Carr.com #4912K99 Miniature Chrome-Plated Brass Ball Valve, Screwdriver Handle, 1/2" NPT Female X Male Connection and a Russell 1/2" NPT 45 degree hose adapter...I can turn it on/off using one thin dime. No need to carry around a screwdriver.

You might need different plumbing depending on the location of your manifold fitting.

69 Chevy is offline   Reply With Quote
Old 07-09-2012, 12:50 PM   #18
marshal135
CF Senior Member
 
marshal135's Avatar
 
Member Since: Sep 2011
Location: Horsham PA
Posts: 1,539
Thanked 72 Times in 62 Posts
Default

Mine is disconnected. Kinda counter productive to expect A/C to work with a heater core passing radiant heat through the same ducts simultaneously.
My divertor doors close properly, heat seeps in still through the firewall.
Even passive heat is still felt with the valve style "fix".
My car is warm inside buttoned up on a 30 degree day w/o a heater.
A/C would be more season appropriate for the times I drive the car.
Marshal
marshal135 is offline   Reply With Quote
Old 07-09-2012, 03:48 PM   #19
roscobbc
CF Senior Member
 
roscobbc's Avatar
 
Member Since: Oct 2005
Location: East London/SW Essex UK
Posts: 1,025
Thanked 1 Time in 1 Post
Default

I used a gas valve - it comes with a nice 3" lever - easy to use

roscobbc is offline   Reply With Quote
Old 07-09-2012, 06:20 PM   #20
superdave269
CF Senior Member
 
Member Since: Feb 2012
Posts: 590
Thanks: 0
Thanked 1 Time in 1 Post
Default

A forum memeber asked me for a pic. They may not be pretty but they work really well. I used 2 natural gas ball valves as they have nice small handles. I'll be installing this set later this week if all goes well. They 1/2 copper for the 5/8 hose the galv. rigid nipples for the 3/4 hose.
Quote:
superdave269 is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Block off heater hose ?
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Heater Core Test Roger L C1 & C2 Corvettes 22 06-05-2015 04:01 PM
    Heater delete, heater hose routing 1964 in 808 C1 & C2 Corvettes 11 02-03-2015 10:29 PM
    Heater Control Valve Bond007 C3 Tech/Performance 14 06-27-2005 09:44 AM
    Help please with Heater Bypass in a BB - 2 methods? mike229 C3 Tech/Performance 3 03-22-2005 11:20 PM
    Heater Hoses for A/C equipped 68? Robbo C3 Tech/Performance 10 05-13-2004 03:46 AM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not 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 Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 01:01 PM.