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Topic: Vacuum actuated heater core shutoff

in Forum: C3 Cooling and Heating Systems

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Vacuum actuated heater core shutoff (1/5)
4/2/08 12:02am

kenimpzoom
Former Member
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Joined: 3/17/2008
Posts: 19

Does a 76 have a vacuum actuated valve that shuts the water off to the heater core?

I am burning up in this car as the heater is always on.

Or do I have to install the manual valves?

Thanks, Ken

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Vacuum actuated heater core shutoff (2/5)
4/2/08 9:34am

EdMan
Former Member
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titusville, FL - USA

Vette(s):
1969 coupe 350/350 m-20 originally cortez silver with gunmetal interior. currently in about a thousand pieces

Joined: 9/30/2006
Posts: 18

Yes all the sharks came with them the originals were made of metal and are available for about 40- 50 bucks. the replacement Delco's are made of plastic to eliminate the rusting problems they're about 20 bucks

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Vacuum actuated heater core shutoff (3/5)
4/2/08 10:52pm

kenimpzoom
Former Member
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Joined: 3/17/2008
Posts: 19

Thanks.

Where is it supposed to be located as I cant see one?

Thanks again,

Ken

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Vacuum actuated heater core shutoff (4/5)
4/3/08 11:19am

jdgrant
Former Member
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HOT SPRINGS NATIONAL PARK, AR - USA

Vette(s):
1978 (25th Annv. Edition)Red, Black interior, 4-Speed Transmission, L-82, Power & Air, Very Rare Option Package(Only 145 Red 1978s with a 4 speed trans) & Very Original Car, with original Window Sticker, Bill of Sale and all documentaion.

Joined: 11/12/2003
Posts: 190

It is mounted on the heater hose (the one that pushes hot fluid to the heater core) directly below where the A/C hoses enter the heater box.

However you must locate the vacuum hose that operates the valve. It should be a very small white tube/hose coming out of the firewall.

If it missing you may want to use a manuel shut off valve.

Hope this helps.

______________

John D. Grant "Corvette; Cure for the common mid-life crisis!"

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Vacuum actuated heater core shutoff (5/5)
4/3/08 9:31pm

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

The only way to totally eliminate the corkpit heat is to install a manual shutoff valve on each heater hose. Even with the vacuum shutoff in good working order the heater core still gets hot water from the other side. The only way to stop this is to have valves on both hoses. Many of us have installed valves...it makes huge difference. NAPA has them at most stores.

Scott

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