Shut off valve
Thread Starter
Pro
Joined: Oct 2003
Posts: 707
Likes: 18
From: Reinholds PA
mean valve that you put in heater hose to stop the water flow in summertime to heater core, they are available in the heater supply places Saw that some people have installed them but dont know which hose it should go on
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
Or you could just bypass your heater.(it's easier) You can buy a bypass adapter(plastic)for less than $5 at any auto store. It has a 3/4 on one end and 5/8 on the other. No cutting required, use the clamps you already have.
Larry
Larry
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Safety Car
Joined: Dec 2004
Posts: 4,876
Likes: 1
From: Jersey Shore Exit 98
that's the one. just so you don't make a mistake its the top hose. You can get a shutoff valve at home depot or lowes in the plumbing dept. you will also need a four inch copper pipe threaded on both ends which fits the S-off and the size of the 5/8 hose. Cut the pipe in half and use hose clamps on either side of the S-off. Works great no more unwanted heat.
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Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
It maybe all in my head, but when I just closed off one hose (the one from the intake manifold), I still could feel some heat coming from under the dash....but when I closed off the other hose, the heat stopped.....
Burning Brakes
Joined: Aug 2005
Posts: 1,126
Likes: 0
From: Hudson Falls, N.Y. 76 Vette Modified L-48
Some people do both, I valved only the hose that was input flow to the core and it works fine, no more heat in the cockpit during summer....I used a PVC hot water heater valve, it works fine, less weight then brass, painted it black with hi temp spray paint...I guess, pick your poison, valve it or connect both hoses in a loop, they will both work
Racer
Joined: Nov 1999
Posts: 331
Likes: 0
From: La porte Texas
I installed one on each hose in case my 34 yr. old heater core started leaking at an inoppertune moment. Well sure enough last summer I found droplets on the floor mat and blocked it in . It is still closed for now .
Racer
Joined: Nov 2004
Posts: 432
Likes: 0
From: Granbury TX
I don't know why some people try to reinvent the wheel. They sale these cutoffs at most auto supply stores, no reason to go to Home Depot and buy valves and fittings. Go to and autosupply store and say "I need a 5/8 inch and a 3/4 inch heater hose cutoff valve."
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
