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Old 10-21-2005, 07:10 PM
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I just purchases a 76 vet, and a friend decided to raise the headlights for night driving. However, he raised them by hand and know I don't know how to lower them. Since I just got the car, and I don't have an owners manual....how do I raise and lower the headlights?


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Old 10-21-2005, 07:17 PM
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There are 2 knobs hanging down under the dash.......these are the manual controls. Is the vacuum system for the headlights not working?
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Old 10-21-2005, 07:25 PM
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I saw the two knobs. One twists to the right and to the left. The other pulls in and out, but nothing happens.
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Old 10-21-2005, 10:50 PM
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Doc here ,

Welcome to the board!

Is Your headlight doors Vacuum or Electrical? (my book doesn't Show the cut off years)

If it is Vacuum, and I'm guessing it is..go to the drop down switch under the dash, and push it up..cycle the headlight switch and see if they don't close this time..(with the engine running) That should do it..

IF not you have leaks in the system, it will show up as poor running out of by[pass also..mine backfired the leaks were so bad...You NEED Vacuum to close the doors opposite of what you'd think it would be..but it is..

You need to determine if you have Vacuum at BOTH the control circuit and the actuator circuit..

Easy test is just pull the hose going to the bypass switch under the dash, and with a hand Vac/pump/gauge (NAPA, $15 bucks..and you'll need it to troubleshoot the system..)

check for vacuum at one or the other hoses..if none there, determine what one goes to the actuator regulators (in the center nose piece, with 2 larger hoses, and one small hose, the small one is control) Put vacuum on that line, up to 20 in Hg..the doors should close..and the vacuum should hold AT least 5 minutes..If that works, trace the other one down, should be on the drivers side, going to a manifold source...and have a Moisture filter on it as well as a one way check valve..check for vacuum here, and leaks..if that's good...

Move on to the Actuator Vacuum circuits..In the nose there is a Vacuum canister about the size of a 3 lb coffee can with 3 or 4 hoses coming off it..pull any one off going to either regulator..and place your vacuum gauge there. Start the engine and look for 17 to 20 in Hg vacuum there, If none, pump it up to 17 to 20 in Hg with the hand pump, the other door should close..(the one not disconnected) If that happens, or in either case backtrack the vacuum line to the engine nd look for leaks or an open..repair and test again..it should all work now...

If the doors won't work at all, both actuator bellows may be shot (common on these cars) you'll need to order an actuator repair kit from corvette central. com I think about $59 bucks..

I'd replace ALL the hoses anyway,as you test, hose is cheap and if its original it probably needs it anyway, and you just may cure the problem while doing so..

To get the doors down manually, crawl underneath the car (hard to do if your a big guy without jacking) and find the linkage rod that runs from the door to the actuator..push outboard on it while LIGHTLY pushing down on the door and it will close..

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