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Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)


Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)
Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)


Corvette by the Numbers
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11/20/16 4:23pm - Original Message: 'Where is the heater control valve located'
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 67
Where is the heater water cut-off valve located on my '75, and how do I access it?



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11/20/16 10:55pm - Reply: 'Re: Where is the heater control valve located'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 377
I am not sure that the 1975s had one but if they did, it would be in the heater hose line going to the core.  I believe it would have a small vacuum line going to it.

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1973 L-82 4 spd

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11/21/16 12:58am - Reply: 'Re: Where is the heater control valve located'
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 67
Okay, it is not in the engine compartment, so I didn't know if it was within the heater box.  Thanks for the response.
My heater does not put out much heat, so before I tried flushing the heater I thought I'd see if a valve was stuck.


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11/21/16 10:08am - Reply: 'Re: Where is the heater control valve located'
Redwoman Gold Member
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Bellingham, MA - USA

Vette(s):
1980 loaded red on red. 68,000 original miles. Second owner. Well documented with all original paperwork. NCRS Founders Award 9/27/14. NCRS Top Flight 10/12/14.

Joined: 6/23/2014
Posts: 171
I'm not sure any corvettes had a shut off. I added a shut off and I think that is what everybody does!

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11/21/16 11:04am - Reply: 'Re: Where is the heater control valve located'
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 67
But Corvette America lists a "heater/water control shutoff valve - #41033" which has a vacuum control on it.

I did add a water shutoff valve in the heater hose, which did help in the Summer, but I'm not getting much heat now that it is cold out.  I'll try flushing the heater core next.

Thanks for the responses.


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11/22/16 1:03am - Reply: 'Re: Where is the heater control valve located'
stingrayjim jr Lifetime Member
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SHELBYVILLE, TN - USA

Vette(s):
1976 L48 auto

1978 L82 4speed

1994 LT1 6speed

Joined: 7/5/2002
Posts: 3934
usually the original shut off was located between the heater core and the engine block.  it kinda looks like a crooked letter "P" with one hose going in and another going out, with a small vacuum line somewhere in the middle.... was not one of GM's best designs, and typically they stopped working and were usually taken off or replaced with a gate valve of some sorts... or some of us would just disconnect the hose all together and route it back to itself on the core, and the other hose from the pump to the intake.....  of course when colder weather comes around, would have to route them properly to get a little heat inside... 
1975-1978 Corvette Water Heater Control Valve
here is a picture of the control valve...hopefully,


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StingrayJim
NCM Lifetime Member #1936

Stingray's '76                             StingrayJr's '78                           Lil Red '94

(click each one to see a bigger version)
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11/28/16 7:02pm - Reply: 'Re: Where is the heater control valve located'
Trent Gold Member
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Bellefontaine, OH - USA

Vette(s):
1975 L-48 4spd Bright Blue tilt/tele/cruise/pw/Holly Carb.

Joined: 10/2/2014
Posts: 21
On my 75' the Heater Valve is in the engine bay on the passenger side connected to one of the heater hoses about a foot from the fire wall.
Hope this helps.
Trent.
 


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 Forums -> C3 Cooling and Heating Systems
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