Headlight test
Thread Starter
Instructor
Joined: Jan 2010
Posts: 183
Likes: 13
Headlight test
Hey Gang,
Assembling front grill area components and really don't want to remove it all again to repair headlights IF they malfunction, is there an easy way to test the vacuum cans? (note word EASY).
Steve
Assembling front grill area components and really don't want to remove it all again to repair headlights IF they malfunction, is there an easy way to test the vacuum cans? (note word EASY).
Steve
Le Mans Master
Joined: Aug 2006
Posts: 7,431
Likes: 1,561
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Headlight Troubleshooting
Actuator test: http://www.corvette-101.com/vacuum.htm#actuator
Have a helper hold the hood 100% up and the actuators will come out from the top.
Have a helper hold the hood 100% up and the actuators will come out from the top.
Team Owner
Joined: Sep 2006
Posts: 31,301
Likes: 4,389
From: Westminster Maryland
Hi Z,
The actuators can be tested with a vacuum pump and gauge.
Disconnect the green hose and hook the red hose to the pump. If vacuum holds, the internal diaphram is good.
Disconnect the red hose and hook the green hose to the pump. If the vacuum holds the internal diaphram and rear sealing grommet are good.
Check the relay valve while you're there too.
Good Luck!
Regards,
Alan
The actuators can be tested with a vacuum pump and gauge.
Disconnect the green hose and hook the red hose to the pump. If vacuum holds, the internal diaphram is good.
Disconnect the red hose and hook the green hose to the pump. If the vacuum holds the internal diaphram and rear sealing grommet are good.
Check the relay valve while you're there too.
Good Luck!
Regards,
Alan
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
With the car running just pinch the small hose at the intake manifold! The one from the check valve. This will make the lights go up.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I don't know what year you have.. but pinch it at C or you could use B.
If the car isn't running.. then you can use a might vac... on hose's 4 or 3
If the car isn't running.. then you can use a might vac... on hose's 4 or 3
Last edited by Willcox Corvette; Jul 9, 2011 at 01:42 PM.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Here's a link that does a good job of explaining how thw vacuum headlights work.
http://forums.corvetteforum.com/c3-t...tem-works.html
Scott
You just lost the game!!!
http://forums.corvetteforum.com/c3-t...tem-works.html
Scott
You just lost the game!!!
