Headlight Help
Le Mans Master
Joined: Aug 2006
Posts: 7,426
Likes: 1,559
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Hi and welcome.
Many times the seal (grommet) in the actuator needs to be replaced.
Here's how to test and repair the parts.
http://www.corvette-101.com/vacuum.htm
Here's how to test and repair the parts.
http://www.corvette-101.com/vacuum.htm
Team Owner
Joined: Sep 2006
Posts: 31,270
Likes: 4,362
From: Westminster Maryland
Hi B,
Welcome!
To help you determine what may be causing the problem with your headlights may be perhaps you might want to try this test while you're going over the information that Pb led you to.
Between the 2 headlight actuators (the cans shaped like 2 pie plates) are 2 vacuum relays (1 small hose and 3 large hoses on each). These direct a vacuum signal to each actuator to open or close the doors.
Carefully move the large red and green hoses from one side's relay to the same position on the other relay.
When all 4 hoses have been moved start the engine and pull the head light switch.
If the left side now opens and closes, but the right side doesn't, this indicates a problem with the left side relay. But, if the left side still doesn't open and close properly this indicates it's a problem with the left side actuator.
Perhaps you may want to give it a try?
Regards,
Alan
These photos show the 2 relays in the center and the actuators on each side. Move the red and green hose from one relay to the other.
Welcome!
To help you determine what may be causing the problem with your headlights may be perhaps you might want to try this test while you're going over the information that Pb led you to.
Between the 2 headlight actuators (the cans shaped like 2 pie plates) are 2 vacuum relays (1 small hose and 3 large hoses on each). These direct a vacuum signal to each actuator to open or close the doors.
Carefully move the large red and green hoses from one side's relay to the same position on the other relay.
When all 4 hoses have been moved start the engine and pull the head light switch.
If the left side now opens and closes, but the right side doesn't, this indicates a problem with the left side relay. But, if the left side still doesn't open and close properly this indicates it's a problem with the left side actuator.
Perhaps you may want to give it a try?
Regards,
Alan
These photos show the 2 relays in the center and the actuators on each side. Move the red and green hose from one relay to the other.
Le Mans Master
Joined: Nov 2016
Posts: 9,256
Likes: 947
From: Lake Tahoe, CA
Willcox also has a good diagram :-)
Last edited by caskiguy; Jul 25, 2017 at 10:56 AM. Reason: Add information
Drifting
Joined: Jul 2006
Posts: 1,259
Likes: 154
From: Deplorableville Nebraska
Vetteworks.tripod.com to fully understand the whole vacuum system
Le Mans Master
Joined: Nov 2016
Posts: 9,256
Likes: 947
From: Lake Tahoe, CA
Interesting.
Le Mans Master
Joined: Nov 2016
Posts: 9,256
Likes: 947
From: Lake Tahoe, CA
Ok, now I see the error in the drawing. Thanks for pointing that out.
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