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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.


How do you install seat covers on a 1977 Corvette?

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

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


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.


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?

== == more than likely your dimmer switch is bad,hope that will help


What is the spark plug gap for a 1977 Corvette?

Spark plug gap for a 1977 Corvette using ACDelco R45TS is .035


Do you have a diagram of a 1977 corvette horn assembly?

You can find a diagram of a 1977 Corvette horn assembly at your local library. Look in the car repair section for a Corvette repair book.


Is 1977 Corvette a stingray?

No, the last year for the Corvette to be called a Stingray was in 1976.


Will the door panels off a 1976 Corvette fit a 1977 Corvette?

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How do you repair a window on a 1977 Chevy Corvette?

== ==


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== ==


What Oil type is used for a 1977 corvette?

15W40


How much did a Corvette cost in 1977?

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You had installed a brand new CD in dash stereo in your 1977 corvette and now when you turn on the headlights it will knock off the stereo until you turn the headlights off again Anyone have an idea a?

The headlights turn off because you have accidently hooked the stereo's power wire onto the headlight relay wire. When you turn on the stereo, there's not enough power left to run the headlight relay. Thus, no headlights. Re-wire the stereo.


Where can you find a vacuum hose diagram for a 1977 Corvette you are replacing all of the broken climate control and engine compartment hoses?

I can' help with a diagram. I can just suggest you do them one at a time, so as to not need a schematic.


Why won't my headlamps on my 1977 corvette go down when I turn them off There is a vacuum hiss at the switch when you try to cut them off pull back out go's away. Is there a simple test?

You have a vaccume leak


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Fuse box location on a 1977 Corvette?

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A roadster is a convertible. The Stingray was the 1969-1977 Corvette model. The 1968 was the same body style, but was not called Stingray.


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No the back spacing is wrong, c-4 to c-6 does not work, GRR


What did a New Jersey couple try to trade for a 1977 corvette?

Their daughter