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Vacuum bypass for head lights on 81 corvette

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Old 04-05-2022, 02:02 AM
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allpro2
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Default Vacuum bypass for head lights on 81 corvette

I ordered a new switch for the vacuum bypass on headlight doors but there's no way it fits, My car has the hole for it in front and not under the dash. Also there's a furrel in the dash that the shaft of the switch must go through and there's no way that can happen since the **** and shaft of the new switch are one piece and doesn't come off. I am thinking there must of been an update for the 81 model and no one at the parts store noticed. Anyone have info on this issue?
Old 04-05-2022, 09:46 AM
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Easy Mike
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Originally Posted by allpro2
...My car has the hole for it in front and not under the dash...
Over ride should be under the dash. Post a pic of your set up.
Old 04-07-2022, 03:28 PM
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MelWff
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Originally Posted by allpro2
I ordered a new switch for the vacuum bypass on headlight doors but there's no way it fits, My car has the hole for it in front and not under the dash. Also there's a furrel in the dash that the shaft of the switch must go through and there's no way that can happen since the **** and shaft of the new switch are one piece and doesn't come off. I am thinking there must of been an update for the 81 model and no one at the parts store noticed. Anyone have info on this issue?
Where did you buy it and what is the part number?
Old 04-09-2022, 12:38 AM
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allpro2
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HOLE FOR BYPASS SWITCH

FURREL GOES IN DASH HOLE
Old 04-09-2022, 12:40 AM
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Default Vacuum bypass problem

As below in pics
Old 04-09-2022, 07:51 AM
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bmotojoe
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The same override switch was used from 1968-1982.
From the photos I have seen of the 81 override switch location yours is in a different location.
Either location to retain the sleeve the switch must be split in 2.
Once the switch is open simply remove the spool, slide the sleeve over the spool, push spool and sleeve back through the opening in "Your" dash then snap the two halves of the switch together.
Before snapping the two halves back together now would be a good time to add a dab of Dow Corning vacuum grease to the spool.
Example:
https://www.amazon.com/Corning-High-Vacuum-Grease-Lubricant/dp/B01ES44RC0/ref=sr_1_2?crid=2I0F31HZ1OFC&keywords=Dow+Corning+High+Vacuum+Grease+1%2F2+oz&qid=1649504829&sprefix=dow+corning+high+vacuum+grease+1%2F2+oz%2Caps%2C136&sr=8-2 https://www.amazon.com/Corning-High-Vacuum-Grease-Lubricant/dp/B01ES44RC0/ref=sr_1_2?crid=2I0F31HZ1OFC&keywords=Dow+Corning+High+Vacuum+Grease+1%2F2+oz&qid=1649504829&sprefix=dow+corning+high+vacuum+grease+1%2F2+oz%2Caps%2C136&sr=8-2

Old 04-09-2022, 11:14 AM
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MattoonVette
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That is not the switch location for the headlight over ride switch on the 81. Is this the over ride switch you have? The factory location was under the column by the trim piece. There should be a metal bracket under there that the switch mounts in. Look behind the small trim piece that is below the steering column. There should be a mounting bracket behind that trim piece going across the opening below the column. You can take that small trim piece off from below the column by removing the 4 small screws that hold it on. The bracket for mounting the over ride switch should be behind it if it is still there. Location shown below.




Last edited by MattoonVette; 04-09-2022 at 11:28 AM.
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Old 04-11-2022, 08:44 PM
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allpro2
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Default Vacuum bypass

Thanks to all, the lower column panel did have a spot for bypass switch. Not sure what other hole was for most likely after market add on.

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