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Old 05-24-2012, 07:45 AM   #16
Metalkid
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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.
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Old 05-24-2012, 09:03 AM   #17
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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.
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Old 05-25-2012, 06:49 AM   #18
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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
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Old 05-25-2012, 07:11 AM   #19
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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
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Old 05-25-2012, 07:11 AM   #20
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Oooops, double post. How do you delete a post?
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Old 05-25-2012, 10:01 AM   #21
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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.
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Old 05-25-2012, 10:19 AM   #22
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Quote:
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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???
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Old 05-25-2012, 12:55 PM   #23
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AFAIK, all A/C cars should have the cutoff valve. If it's not there, it's been removed.
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Old 05-25-2012, 01:05 PM   #24
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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.
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Old 08-19-2019, 10:50 AM   #25
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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?
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