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It sounds like you have a vacuum leak somewhere in your system. Probably in a hose somewhere. purchase a vacuum squeeze pump from an auto parts store or mid america. Connect straight to your headlight diaghram. Onec you squeeze the light open it shoul remain open. If not you need to replace the diaphram.Mid America has a book on the wiper and vacuum system for these vettes that is excellent. i suggest you go ahead and buy some new check valves that the book describes. I had problems and followed these procedures and for less than 200 bucks my light have been working great for ten years.Mid America's website is

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โˆ™ 2007-01-02 22:27:28
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Q: How do you fix lazy headlights that won't go up all the way by themselves in a 1981 Corvette?
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If they are vacuum operated then I would suspect a vacuum hose leak. It may also be that some moving parts need lubrication.

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