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There is a vacuum line attached to the back of the headlight switch on the dash. When you pull the switch out to turn on the lights this allows vacuum to open the light doors through rubber vacuum lines. When you turn the lights off this cuts the vacuum to the lights and a spring opperates the doors and closes them.

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โˆ™ 2006-05-02 14:18:39
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Q: How does the vacuum operate the headlights in a 1977 corvette?
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Why dont the lights go down on your 1977 corvette?

The headlights require a vacuum to operate down. If there is no vacuum they remain in the up position. You may have a vacuum leak such as a disconnected or broken vacuum line. I have also seen the vacuum reservoir can rotted out and unable to hold a vacuum.


Can a 1978 Corvette headlight fit on 1977 Corvette?

Yes, the headlights should be completely identical.


Where can you find a 1977 corvette vacuum headlight hose diagram?

go to http://www.supermotors.net/registry/media/611233


What is a 1977 Corvette?

A Corvette that was built in late 1976 up to late 1977.


Why would the headlight doors on a 1977 corvette just stop working headlights work just fine but neither one will pop up?

Your vacuum system has a leak. If both of your doors stopped working at the same time, I would check up stream from the actuators. Check out docrebuild.com for diagrams and the parts.


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what is the process for installing new seat covers in a 1977 chevrolet corvette


How do you install power window switches for a 1977 Corvette?

How do I replace the power window switch on 1977 Corvette coupe


Why does the low beam headlight not illuminate in your 1977 Corvette when you first turn the headlights on but does when you hit the high beams?

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