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C3 Corvettes, 1968 - 1982
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Vacuum issue

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Vacuum issue

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Old

Aug 24, 2014 | 04:47 PM

#1

npatton

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Vacuum issue

After owning my 1972 roadster for 35 years I have a sudden vacuum issue. Yesterday both my headlight doors and the wiper door failed to open. The vacuum at the manifold is 14 and at the large outlet on the check valve however the small side is showing nothing. I believe this is the issue but was hoping to get a second opinion. Since I opened the headlights manually is there a special trick to closing them?

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Old

Aug 24, 2014 | 05:50 PM

#2

'75

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Sounds like you need a new check valve. You should be able to put a T in place of it for testing purposes, till you get the new check valve.

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Old

Aug 24, 2014 | 05:55 PM

#3

Sayfoo

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From: Orange County Ca

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Quote:

Originally Posted by npatton

After owning my 1972 roadster for 35 years I have a sudden vacuum issue. Yesterday both my headlight doors and the wiper door failed to open. The vacuum at the manifold is 14 and at the large outlet on the check valve however the small side is showing nothing. I believe this is the issue but was hoping to get a second opinion. Since I opened the headlights manually is there a special trick to closing them?

You should be able to reach up under the headlight assembly (under the bumper) and pull on the linkage to release it. A knee action joint that over travels to lock up. On my 69, the linkage extends past the pivot point about 1 1/2" and there is a hole through the hub.

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Old

Aug 24, 2014 | 08:28 PM

#4

npatton

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Quote:

Originally Posted by Sayfoo

You should be able to reach up under the headlight assembly (under the bumper) and pull on the linkage to release it. A knee action joint that over travels to lock up. On my 69, the linkage extends past the pivot point about 1 1/2" and there is a hole through the hub.

Thanks that worked.

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Old

Aug 24, 2014 | 08:29 PM

#5

npatton

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Quote:

Originally Posted by '75

Sounds like you need a new check valve. You should be able to put a T in place of it for testing purposes, till you get the new check valve.

Ok thanks.

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Old

Aug 25, 2014 | 07:31 PM

#6

Sayfoo

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From: Orange County Ca

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You can also reach under and push on the linkage to open if you ever have a problem getting them to pop up

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