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Thread: Heater hose / heater core cut-off valve Reply to Thread
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Topic Review (Newest First)
08-19-2019 10:50 AM
JoeyA
Quote:
Originally Posted by 6880 Mike View Post
AC cars have the cut off valve, depending on model year. Non-AC usually do not have one.

You can add one. You can also purchase rubber caps which allow you to remove the hoses and cap off the lines on the engine.

new here! but where would you recommend to purchase rubber caps?
05-25-2012 01:05 PM
clemsontiger
Quote:
Originally Posted by Batbrain View Post
AFAIK, all A/C cars should have the cutoff valve. If it's not there, it's been removed.
So what color vaccum hose should be going to it? Everything I see shows white, but my white doesn't go there and were it should go it is obvious that there was never anything there.
05-25-2012 12:55 PM
Batbrain AFAIK, all A/C cars should have the cutoff valve. If it's not there, it's been removed.
05-25-2012 10:19 AM
clemsontiger
Quote:
Originally Posted by gtr1999 View Post
my original base 350 automatic w/ac didn't have them. The SB 4 speeds had the expansion tanks in the early 70's and the only valve I've seen is also in a SB 4 spd, non ac car.
This seems to be what I'm hearing as well. So...I don't quite understand how the A/C works with the heater core full of hot water all the time???
05-25-2012 10:01 AM
gtr1999 my original base 350 automatic w/ac didn't have them. The SB 4 speeds had the expansion tanks in the early 70's and the only valve I've seen is also in a SB 4 spd, non ac car.
05-25-2012 07:11 AM
clemsontiger Oooops, double post. How do you delete a post?
05-25-2012 07:11 AM
clemsontiger Is it possible that my car didn't come with an expansion tank or heater control valve? I talked with a local Corvette guy yesterday and he said my car wouldn't have come with one...which makes sense based on what I'm seeing, ie; the holes where the expansion tank should be mounted were never drilled out. I'm also not seeing any sign that there ever was a heater control valve mounted anywhere. The final thing is, as mentioned above, the white line coming from the A/C control in the console doesn't go through the firewall, but rather to some kind of actuator on the back of the inside heater box. The only two hoses going through the firewall are black and green/black (see pic). Also, when I look on the firewall outside, the third hole, below black and gree/black is factory sealed...never punctured, for another hose.

Any help guys?


Untitled by clemson_tiger29679, on Flickr
05-25-2012 06:49 AM
clemsontiger Is it possible that my car didn't come with an expansion tank or heater control valve? I talked with a local Corvette guy yesterday and he said my car wouldn't have come with one...which makes sense based on what I'm seeing, ie; the holes where the expansion tank should be mounted were never drilled out. I'm also not seeing any sign that there ever was a heater control valve mounted anywhere. The final thing is, as mentioned above, the white line coming from the A/C control in the console doesn't go through the firewall, but rather to some kind of actuator on the back of the inside heater box. The only two hoses going through the firewall are black and green/black (see pic). Also, when I look on the firewall outside, the third hole, below black and gree/black is factory sealed...never punctured, for another hose.

Any help guys?


Untitled by clemson_tiger29679, on Flickr
05-24-2012 09:03 AM
blckslvr79
Quote:
Originally Posted by Metalkid View Post
Be aware that this vac line is (at least on a 78) a thin (1/8" OD?) white plastic hard line, (not rubber) that if original, is likely brittle and prone to breakage. You may not see more than a short piece protruding from the firewall, or even broken off at the firewall.
My '79 has a special grommet in the firewall. Inside the cabin and under the hood, it has standard vaccum line attached to that grommet. I don't have hard plastic.

Again, maybe years are different?
The '79's also had the vacuum valve above the frame on the passenger side near the radiator overflow tank. Right out in the open.
05-24-2012 07:45 AM
Metalkid
Quote:
Originally Posted by 6880 Mike View Post
Routes from the AC console control, through the firewall, and over to the valve.
Be aware that this vac line is (at least on a 78) a thin (1/8" OD?) white plastic hard line, (not rubber) that if original, is likely brittle and prone to breakage. You may not see more than a short piece protruding from the firewall, or even broken off at the firewall.
05-24-2012 07:11 AM
6880 Mike
Quote:
Originally Posted by clemsontiger View Post
...where is the vacuum line that is supposed to operate it?...
Routes from the AC console control, through the firewall, and over to the valve.

The assembly instruction manual (AIM) would help you. It has diagrams of the factory AC installation, including the vac hose routing and the location and plumbing for the cut off valve.

05-24-2012 06:29 AM
clemsontiger I think someone removed both my expansion tank and this valve as neither are anywhere to be found. :-/ No my problem is...where is the vacuum line that is supposed to operate it?
05-23-2012 09:44 PM
Batbrain The stock valve on my 77 was right in the middle of the passenger side of the engine bay, in the same area as the expansion tank. It may have moved over the years.
05-23-2012 08:30 PM
iburke You will find it on the passanger side just below the heater fan motor in the wheel well just to the rear of the expantion tank.

You can get to it by removing the side louver...
05-23-2012 04:58 PM
Batbrain
Quote:
Originally Posted by blckslvr79 View Post
The aftermarket vacuum valves are plastic and work much better. My heater core stays cold when the valve is closed.
Agreed. The stock metal valves don't work very well at all. Especially after 35-40 years of wear and tear.
This thread has more than 15 replies. Click here to review the whole thread.

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