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6/26/08 1:32pm - Original Message: 'Heater Hoses'
79FOREVER
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METAIRIE, LA - USA

Vette(s):
1979 BLACK COUPE

Joined: 6/7/2007
Posts: 144

On my 79 which heater hose is the inlet and which is the outlet.  Which hose feeds coolant to the heater core and which exits coolant from the core?  I don't have a vacuum hot water shut off valve on it and I am think to putting some type of shut off on it again.  My intent is to cut off fluid to the heater core and stop pressure on one or both lines if possible. 

 
Joe
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6/26/08 2:26pm - Reply: 'Heater Hoses'
767REP Lifetime Member
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Joined: 3/31/2007
Posts: 293
I just capped mine off at the water pump yesterday, $2.00 and just tucked the heaterhose into the fender beside the a/c compressor. Works great and easy to install and remove (best of all cheap)Wink

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6/26/08 4:48pm - Reply: 'Heater Hoses'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
Posts: 2580
The one going to water pump is the outlet or return. Most guy's will put shut-off on both hoses.

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6/26/08 10:37pm - Reply: 'Heater Hoses'
kstyer Lifetime Member
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CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6410
It really does not matter which hose  you put the valve on.  If you stop the water flow in or out, you also stop the other one.  No flow is no flow.

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6/26/08 10:48pm - Reply: 'Heater Hoses'
ranger3 Lifetime Member
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North Charleston, SC - USA

Vette(s):
1975 L48 AT AC T-top

Joined: 3/20/2004
Posts: 4176
Mine made no difference at all until I put valves on both hoses. Even if the hot water is not moving, it is still in the heater core. That heat will still infiltrate the corkpit. On most of the threads posted. most people valved both heater hoses. Again, putting one valve on mine made little to no difference. When I did both, it made a huge difference. I hope this helps. I hope someone else chimes in.

Scott
ranger32008-07-14 18:09:57

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6/26/08 11:20pm - Reply: 'Heater Hoses'
kstyer Lifetime Member
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CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6410
With one there is no flow.   If two helped, it had to block heat radiating through the non flowing water.  Possible.  I have only one and it works fine.

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On the "Tail of the Dragon"
(some day, no strike that, October 2008 it turned red, still in progress!)

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6/27/08 7:07am - Reply: 'Heater Hoses'
crossfire1982
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Cramerton, NC - USA

Vette(s):
black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

Joined: 8/22/2006
Posts: 1094
Here is an old thread on the same topic.  Seems its a "HOT" topic every summer Rolling%20On%20The%20Floor%20Laughing

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6/27/08 8:50am - Reply: 'Heater Hoses'
79FOREVER
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METAIRIE, LA - USA

Vette(s):
1979 BLACK COUPE

Joined: 6/7/2007
Posts: 144

Thanks for the inputs.  It appears the hoses may have been two different sizes?  3/4 and 5/8?  I also discovered last night in my assembly manual there is a tube inline under the a/c bracket for the lower hose coming off the water pump.  I need to get it, just running the a hose right now.  I had a valve on it at one time, but it always got corroded and had to be replaced. 



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Joe Dewey             
joseph.d.dewey.mil@mail.mil
joe.dewey@yahoo.com


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7/14/08 12:29pm - Reply: 'Heater Hoses'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
I've been reading many of these threads about installing heater hose shutoff valves. Sounds like a good idea. 
I'd like to go ahead and get this done & I'll be using 2 valves - 1 on each heater hose.
(How am I doin' so far?)
My qeustions are;
1) If I install both valves and run the engine, should I first shut one valve off to block any further coolant from entering the heater core?
2) Then, would leaving the other one opened for a time evacuate what coolant is left in the heater core. At some point I'll know the heater core is empty (I hope) and then I'd close the second valve. I'm thinking that an empty heater core is what I'm after to keep things cooler.
3) If I'm on the right track here, does an empty heater core rot out or cause other problems?
 
I hope I'm not overcomplicating an easy job. Confused


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7/14/08 1:55pm - Reply: 'Heater Hoses'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Just to throw this out there, I have made sure my sytem is working properly.(new vacum valve and testing that vacum is there to shutoff the valve.  I was wondering if placing onother vacum valve on the other hose would make a differance.

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Bob R
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7/14/08 8:07pm - Reply: 'Heater Hoses'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
Posts: 2580
[QUOTE=KDADDY79]I've been reading many of these threads about installing heater hose shutoff valves. Sounds like a good idea. 
I'd like to go ahead and get this done & I'll be using 2 valves - 1 on each heater hose.
(How am I doin' so far?)
My qeustions are;
1) If I install both valves and run the engine, should I first shut one valve off to block any further coolant from entering the heater core?
2) Then, would leaving the other one opened for a time evacuate what coolant is left in the heater core. At some point I'll know the heater core is empty (I hope) and then I'd close the second valve. I'm thinking that an empty heater core is what I'm after to keep things cooler.
3) If I'm on the right track here, does an empty heater core rot out or cause other problems?
 
I hope I'm not overcomplicating an easy job. Confused
[/QUOTE]
 
Hey Kevin. Ah, your over complicating an easy job.LOL
All you need to do is splice in 1 or sometimes guy's put in 2 valves. Close em when ya don't want heat. Open em when ya do. I've done it to a bunch of vehicles and it works fine.


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7/14/08 8:12pm - Reply: 'Heater Hoses'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
Posts: 2580
[QUOTE=rraider1]Just to throw this out there, I have made sure my sytem is working properly.(new vacuum valve and testing that vacuum is there to shutoff the valve.  I was wondering if placing onother vacum valve on the other hose would make a differance.[/QUOTE]
 
Personally I've never heard of putting a vacuum valve on the return side. I really don't think its gonna make a difference. Some guy's put manual valves on both hoses, but in my own experience, I don't think that's necessary either. Just my .02


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7/14/08 8:22pm - Reply: 'Heater Hoses'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Alright then, I'll keep it a simple job after all!   Big%20smile
 
Thanks for the input!


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8/12/08 10:40am - Reply: 'Heater Hoses'
79FOREVER
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METAIRIE, LA - USA

Vette(s):
1979 BLACK COUPE

Joined: 6/7/2007
Posts: 144
I have decide not to re-install my lines at all, I just hope my heat core doesn't go to camp due to non-use.  I do not use the car that much in the winter and it is to hot down here anyway.   Just four more possible leaks.  System is down right now, I will buy nipple & plug kit and have on hand if I want to install the lines.

____________________________________
Joe Dewey             
joseph.d.dewey.mil@mail.mil
joe.dewey@yahoo.com


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8/12/08 11:03am - Reply: 'Heater Hoses'
hmel '74
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Carlisle, PA - USA

Vette(s):
1974 mille miglia red with oxblood interior 355ci, 320hp

Joined: 9/4/2005
Posts: 533
[QUOTE=my7T1][QUOTE=KDADDY79]I've been reading many of these threads about installing heater hose shutoff valves. Sounds like a good idea. 
I'd like to go ahead and get this done & I'll be using 2 valves - 1 on each heater hose.
(How am I doin' so far?)
My qeustions are;
1) If I install both valves and run the engine, should I first shut one valve off to block any further coolant from entering the heater core?
2) Then, would leaving the other one opened for a time evacuate what coolant is left in the heater core. At some point I'll know the heater core is empty (I hope) and then I'd close the second valve. I'm thinking that an empty heater core is what I'm after to keep things cooler.
3) If I'm on the right track here, does an empty heater core rot out or cause other problems?
 
I hope I'm not overcomplicating an easy job. Confused
[/QUOTE]

i'm kinda with kevin here.  i put the valves on my hoses and i still seem to have a lot of heat coming from the heater vents by my feet (and yes, the valves are closed Wink)
i thought maybe i had to purge the heater core also.





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8/12/08 11:37am - Reply: 'Heater Hoses'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
Posts: 2580
If you have shutoff valves in your lines it will not make any difference if you purge core as there will be no hot coolant going through it. It really is a good idea to keep coolant in the core to keep it from drying out if not used in a long period of time. As to why your still getting heat, the shutoff valves may not be closing completly or your getting hot air from outside bypassing your evaporator core.

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8/12/08 12:33pm - Reply: 'Heater Hoses'
79FOREVER
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METAIRIE, LA - USA

Vette(s):
1979 BLACK COUPE

Joined: 6/7/2007
Posts: 144

I may try and keep some coolant in it, push it in and loop / connection one hose to each tube, thus keeping coolant in the core.



____________________________________
Joe Dewey             
joseph.d.dewey.mil@mail.mil
joe.dewey@yahoo.com


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