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1978 C3: My headlights are stuck in an open position.
Any guidelines in troubleshooting this problem...Thanks,
zzzs
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R
BIG HAMMER
, SORRY IT'S BEEN ONE OF THOSE DAYS. nOT SURE IF YOUR YEAR IS ANYTHING LIKE MINE SO NOT MUCH HELP HERE, BUT THERE IS GOING TO BE ANSWERS TO YOUR QUESTION FROM SOME ONE ON THIS SITE...
, SORRY IT'S BEEN ONE OF THOSE DAYS. nOT SURE IF YOUR YEAR IS ANYTHING LIKE MINE SO NOT MUCH HELP HERE, BUT THERE IS GOING TO BE ANSWERS TO YOUR QUESTION FROM SOME ONE ON THIS SITE...Be the first to like this post
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Maybe this will help: http://vetteworks.tripod.com./techdocuments/Vaccum.html Big Fish 38603.7006481482
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See mcspeed.com and change to "Killer Lights". They are no more expensive than replacing your vacuum components. Killer lights use electric motors and eliminate any possibility of a vacuum leak with your headlights. Mine work great and open every time and together. They close the same way. Another plus is that the car runs better without sucking all of that vacuum.
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NCM Life Member #994
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Does the vaccuum system come from the engine or transmission?....zzzs
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R
Engine,there is a vacuum T right behind the carburater,the line for your headlights goes to a white plastic filter,then the hose goes to a metal valve which is a 1 way valve on the back side of the valve are 2 fittings one line if I remember correctly goes into the firewall the other one goes into the hose that feeds the vacuum tank for your headlights,on your 78 the hose goes all the way down in front of the radiator,where it connects to a large crossmember that goes between the frame rails.that is the vacuum tank on 78s and newer Vettes
C3VR Lifetime Member #93
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The vacuum line going thru the firewall, does that operate
or affect the vent for the heater/AC ? My AC is
not comming out the dash vents...thanks
chuck.
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R
Yep,the line going through the fire wall goes to a couple of things,some of the vacuum goes to the headlight switch- over ride switch,the over ride switch is directly below the steering column,you pull it down,to raise or lower the headlights manually with out having to use the headlight switch.the rest of the vacuum goes over to the heater control switch,which from there is routed out to the other parts of the heater A.C. system ,vacuum door actuaters,hot water control valve,etc. so you can see,if you have any vacuum leaks,they will add up quickly and something isnt going to get enough to operate,and with vacuum lines that are over 25 years old ,such as the ones in your car and mine you ARE going to have leaks no doubt about it,I have replaced all the vacuum lines in the engine compartment,but have'nt touched any inside the cabin yet,that is going to be a winter project
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t
In the dr rebuild catalog you can purchase a vacuum trouble shooting guide for $3.95
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in Forum: C3 Electrical, Body and Interior
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