heater core shutoff 69
Thread Starter
Heel & Toe
Joined: Sep 2007
Posts: 16
Likes: 0
From: San Diego ca
heater core shutoff 69
I'm installing a heater core shut off and my hose that returns from the heater core passes throw the coolant overflow. Is it OK to shut off this type system. Also the shutoff valve I bought narrows considerably from 5\8 to maybe 1\4 is this ok. I'm assuming that its fine but I thought I double check before I did it.
Le Mans Master
Joined: Oct 2001
Posts: 6,798
Likes: 25
From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
I sure would like to see a picture of that!
I don't claim to be anything special on cars, but a heater hose running through the overflow seems a little weird.
Putting a 5/8 to a 1/4 valve will be a problem. 1st..how are you going to connect the hose to a 1/4 nipple. 2nd... as long as you have the valve shut off it won't make a difference. When you open it you will have a problem. Too much restriction. I assume that the heater hoses are that size for a reason. I think it would be a lot easier to just go get another valve.
Larry
I don't claim to be anything special on cars, but a heater hose running through the overflow seems a little weird.
Putting a 5/8 to a 1/4 valve will be a problem. 1st..how are you going to connect the hose to a 1/4 nipple. 2nd... as long as you have the valve shut off it won't make a difference. When you open it you will have a problem. Too much restriction. I assume that the heater hoses are that size for a reason. I think it would be a lot easier to just go get another valve.
Larry
Last edited by lebvette; Jul 13, 2008 at 10:23 AM.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
The heater hose goes in and back out of the coolant tank with a 1/4 or 5/16 back to the rad. tube.Here is a link showing the tank he is using.(There are 3 nipples on the tank one of the larger ones you cant see very well plus one for the overflow)
http://www.volvette.com/CL018.html
http://www.volvette.com/CL018.html
Last edited by ...Roger...; Jul 13, 2008 at 10:49 AM.
Le Mans Master
Joined: Oct 2001
Posts: 6,798
Likes: 25
From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
Would someone explain how it works, and why it is like that.
My overflow is a plastic tank.....live and learn.
Larry
My overflow is a plastic tank.....live and learn.
Larry
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
There's a difference between a coolant tank and an overflow tank. My 1967 does not have a rad cap on the radiator. The system is pressurized through a cap on the coolant tank.
To answer the question, this valve from Home Depot works.
To answer the question, this valve from Home Depot works.
Thread Starter
Heel & Toe
Joined: Sep 2007
Posts: 16
Likes: 0
From: San Diego ca
A different view of the Expansion Tank
http://www.zip-products.com/Zip/prod...sp?pf_id=M-319
My hose is not T like Paul’s. Just in one side out the other. I don’t know if that makes any difference.
My shut off looks about the same as Paul’s 5/8 to 5/8 but inside of the valve its pretty small. But I suppose if it’s not as hot as it’s could be it’s probably not a problem.
http://www.zip-products.com/Zip/prod...sp?pf_id=M-319
My hose is not T like Paul’s. Just in one side out the other. I don’t know if that makes any difference.
My shut off looks about the same as Paul’s 5/8 to 5/8 but inside of the valve its pretty small. But I suppose if it’s not as hot as it’s could be it’s probably not a problem.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
You probably dont need much heater action in Texas anyway.
Most valves are going to downsize some. If your worried about the flow you can always do what I do and thats just put a clamp on the 5/8 hose-no valve to buy-no extra clamps to leak-just remove clamp and you have full flow once again-great for NCRS because the valve is not there-best of both worlds.
Most valves are going to downsize some. If your worried about the flow you can always do what I do and thats just put a clamp on the 5/8 hose-no valve to buy-no extra clamps to leak-just remove clamp and you have full flow once again-great for NCRS because the valve is not there-best of both worlds.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Melting Slicks
Joined: Dec 2000
Posts: 3,363
Likes: 303
From: Lansdale 19446 PA
2024 C3 of the Year Finalist- Unmodified
St. Jude Donor '10-'11, '15, '19
There is no radiator cap on the radiator making this external tank the expansion tank for the radiator. To me, that means that you must keep the flow of water to & from the expansion tank. If you restrict the flow on either hose, you will be increasing the pressure within the radiator, which creates a different problem.
My solution was to by pass the heater core - going from the water pump to one port on the expansion tank, the from the expansion tank back to the block.
I don't drive in the winter anyway.
