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Topic: Reduce interior heat w/ a hot water shut-off valve

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Reduce interior heat w/ a hot water shut-off valve (1/21)
7/10/04 1:32am

C3RVETTE
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Anacortes, WA - USA

Vette(s):
1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets

Joined: 12/16/2002
Posts: 1293

http://temp.corvetteforum.net/c3/joeveto/Hot_Water_Shut-Off.shtml The last couple pics are missing,but a fairly good how-to guide... |smokin|

|smokin|

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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

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Reduce interior heat w/ a hot water shut-off valve (2/21)
7/10/04 8:58am

Big Fish
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Joined: 12/16/2003
Posts: 630

For what it's worth, you can buy a ball valve at Home Depo or Lowe's that already has the hose barbs as part of the casting. Cut the hose, install the valve, done for under 10 bucks. I personally prefer the hose barbs over the smooth stubs of copper tubing, less chance for the hose to blow off, and you really don't need the bleeder.

Reduce interior heat w/ a hot water shut-off valve (3/21)
7/10/04 1:17pm

C3RVETTE
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Anacortes, WA - USA

Vette(s):
1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets

Joined: 12/16/2002
Posts: 1293

Sounds good...Lowes,huh? Got one fairly close.Havent done this yet,but I need to.Which hose? Upper or lower? Probly upper... |idea|

|idea|

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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

Reduce interior heat w/ a hot water shut-off valve (4/21)
7/10/04 1:25pm

Big Fish
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C3RVETTE said: Sounds good...Lowes,huh? Got one fairly close.Havent done this yet,but I need to.Which hose? Upper or lower? Probly upper... |idea|

|idea|

Can't remember upper or lower, but you want to install in the 5/8" line. The other line is 3/4".

Reduce interior heat w/ a hot water shut-off valve (5/21)
7/10/04 9:20pm

FLA VETTE
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ORLANDO, FL - USA

Vette(s):
1980 L82 Dark Metallic Green Coupe, Gymkhana Suspension, AM/FM/CB, GM ZZ383....nice....

Joined: 12/11/2002
Posts: 459

You can also find the valve in Advanced Discount auto. I would recommend a screw type valve vs a quarter turn valve. I had the quarter turn ball valve from the PO and it leaked by. Installed a screw type and now I have tight shutoff.

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1980 L82 (5069 made), Dark Green Metalic (844 made)

Gymkhana Suspension, AM/FM/CB, Sporting a ZZ383.........

Reduce interior heat w/ a hot water shut-off valve (6/21)
7/10/04 11:14pm

C3RVETTE
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Anacortes, WA - USA

Vette(s):
1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets

Joined: 12/16/2002
Posts: 1293

FLA VETTE said: You can also find the valve in Advanced Discount auto. I would recommend a screw type valve vs a quarter turn valve. I had the quarter turn ball valve from the PO and it leaked by. Installed a screw type and now I have tight shutoff.

I think you mean a gate valve.The screw down handle closes a "gate" in the valve body that shuts off flow.What size did you use?

|UPDATED|7/10/2004 8:14:20 PM (AZT)|/UPDATED|

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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

Reduce interior heat w/ a hot water shut-off valve (7/21)
7/10/04 11:31pm

FLA VETTE
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ORLANDO, FL - USA

Vette(s):
1980 L82 Dark Metallic Green Coupe, Gymkhana Suspension, AM/FM/CB, GM ZZ383....nice....

Joined: 12/11/2002
Posts: 459

Like Big Fish said, on the smaller of the two lines.

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1980 L82 (5069 made), Dark Green Metalic (844 made)

Gymkhana Suspension, AM/FM/CB, Sporting a ZZ383.........

Reduce interior heat w/ a hot water shut-off valve (8/21)
7/12/04 10:17pm

Steve
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CONCORD, MA - USA

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78 Silver Anniversary (2 Tone) L82 auto loaded

Joined: 6/12/2002
Posts: 185

You should have a vacuum operated valve that shuts off the heater water from the factory!
Steve |wavey|

|wavey|

Reduce interior heat w/ a hot water shut-off valve (9/21)
7/13/04 7:40am

vetteonr
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Southgate, MI - USA

Vette(s):
1980 L48 4 speed.

Joined: 4/4/2003
Posts: 249

Three questions:

1. Does it make that big of a difference?

2. How does it effect the engine cooling since you're cutting off part of the circulation system?

3. What effects will this have on the heater core and return hose if they are dry for a while?

|headscratch|

|headscratch|

|headscratch|

|headscratch|

|headscratch|

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Corvette..........Enough Said!!!

Reduce interior heat w/ a hot water shut-off valve (10/21)
7/13/04 8:22am

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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: 6424

1. Yes it makes a big difference.
2. It won't affect engine cooling at all. This is a factor with some cars, 4 cyl Mopars for example, but not a GM. Some GM factory set ups have a vacuum operated cutoff valve from the factory to shut off the heater when the A/C is on.
3. The core does not go dry, there is coolant in the other line and core. You just stop it from circulating. You should open it for a short time once in a while to keep from building sludge.

|UPDATED|7/13/2004 5:22:22 AM (AZT)|/UPDATED|

Reduce interior heat w/ a hot water shut-off valve (11/21)
7/13/04 3:06pm

C3RVETTE
Former Member
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Anacortes, WA - USA

Vette(s):
1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets

Joined: 12/16/2002
Posts: 1293

I havent got the parts yet,but I'm planning on stopping by my local Lowes.You said its the smaller of 2 hoses? 5/8"'s? I think Kyster is correct,& I wont,at least now,have to get to & check this vacuum valve you've mentioned.Now I'm stuck on which valve to use,but there shouldnt be that much pressure,so a ball valve should work fine,rite? I went to an air show my local club was invited too this last Sunday,& didnt take the tops off at 7:30 am when we went over cuz it was overcast & drizzly,but after parking there it got quite warm, & on the way back put on the vent,& man the air coming out of there was almost hot this time.

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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

Reduce interior heat w/ a hot water shut-off valve (12/21)
7/13/04 6:21pm

Big Fish
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Posts: 630

Jon

Typically the ball valves are rated at 125 pounds (minimum) and "WOG" (water, oil, or gas). They should not have any problem whatsoever on the smaller (5/8") heater hose line. Like Ken suggested, open it every now and then to prevent any solids from accumulating in the un-circulated coil and piping. The valve I used (from Lowes) had 5/8" hose barb connections, the only other things I needed were properly sized hose clamps. Try to locate the valve as far away from the exhaust manifold as you conveinently can because the heat from the manifold might melt the plastic off the valve handle if it's really close.

Reduce interior heat w/ a hot water shut-off valve (13/21)
7/13/04 8:11pm

C3RVETTE
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Anacortes, WA - USA

Vette(s):
1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets

Joined: 12/16/2002
Posts: 1293

OK,I'll see if they,ve got the barbed valve.I havent done alot of soddering,& it sounds like its pretty much ready to go...

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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

Reduce interior heat w/ a hot water shut-off valve (14/21)
7/14/04 6:09am

TOORED
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Pompton Lakes, NJ - USA

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1979 Coupe

Joined: 2/13/2003
Posts: 65

Man, I love this site............ My local Corvette club meets in the service bay of a Chevy dealer, and I get more solid tech information in one night on this site, than I have in two years of club meetings. Adam, ten bucks a year is a stone bargain!

|UPDATED|7/14/2004 3:09:39 AM (AZT)|/UPDATED|

Reduce interior heat w/ a hot water shut-off valve (15/21)
7/14/04 1:30am

C3RVETTE
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Anacortes, WA - USA

Vette(s):
1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets

Joined: 12/16/2002
Posts: 1293

I've been going to club meetings around here off & on for a couple years.We NEVER talk tech,just plan meetings,cruises,& shows!

|UPDATED|7/13/2004 10:30:37 PM (AZT)|/UPDATED|

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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

Reduce interior heat w/ a hot water shut-off valve (16/21)
7/14/04 1:01am

Chips58
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, - Australia

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71 Coupe Black on Black

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Reduce interior heat w/ a hot water shut-off valve (17/21)
7/14/04 7:38am

vetteonr
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Southgate, MI - USA

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1980 L48 4 speed.

Joined: 4/4/2003
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Thanks for the answers Ken. This is something I'm really looking to do.

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Reduce interior heat w/ a hot water shut-off valve (18/21)
7/14/04 11:20am

garry72conv
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BRADENTON, FL - USA

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1972 convertible 350 auto trans, delux int, air, ps, pb, t/t wheel, pw, 79,000 org miles Rare one year only color

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Posts: 669

i plan on installing mine behind the gills. you can access it from under the car or us lucky enough to have removable gills behind the gills. it will be out of sight that way. a ball valve or quarter turn valve or a vacuume valve will be better than a gate valve as the gate valve is larger and requires more turns to close.

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Reduce interior heat w/ a hot water shut-off valve (19/21)
7/14/04 11:23am

C3RVETTE
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Anacortes, WA - USA

Vette(s):
1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets

Joined: 12/16/2002
Posts: 1293

You're welcome |wavey|

|wavey|

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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

Re: Reduce interior heat w/ a hot water shut-off valve (20/21)
9/18/14 1:35pm

dwa175
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leesburg, FL - USA

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1979 coupe and now 2007 c-6

Joined: 7/19/2014
Posts: 195

hi can we get pics of T-tops dwa

Re: Reduce interior heat w/ a hot water shut-off valve (21/21)
9/18/14 7:35pm

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Grapevine, TX - USA

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1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 1409

You can get this at O'Reilly or Autozone:

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