Menu

headlight goes down slow

by Keith
(Port St Lucie , Florida)

C3 Corvette Headlight Vacuum Diagram

C3 Corvette Headlight Vacuum Diagram

When I put the headlights on both go up. When I turn the headlights on the right headlight goes down but the left headlight will only go down if I rev the engine up to create more vacuum

Comments for headlight goes down slow

Average Rating starstarstarstarstar

Click here to add your own comments

Jan 21, 2016
Rating
starstarstarstarstar 		Vacuum Leak
by: Chris

Well the good news is its either a vacuum leak or maybe another vacuum leak. Seriously though vacuum leaks are such an issue for C3 Vettes. Its a little smoke and mirrors to troubleshoot but not to bad once you get the hang of it while using the proper tools. Make sure you reference the diagram above for our discussion.

Check all hoses for condition and cracking with engine running at idle.

Check for proper engine vacuum at point "2" and "K" and compare each point. They should be the same. If not you have a leak in the hose leading to the tank.

Next Check Vaccum at Actuators "E" in operation and compare to tank vacuum once again these should be the same. If not check Relays "D" and hoses.

The goal is to isolate and test for leaks.

Next Vacuum check with a 2 in 1 Brake Bleeder & Vacuum Pump Test Tuner Tool
by applying vacuum to the return side of the Corvette Headlight Actuator, With Boot & Seal
"E" after disconnecting all hoses. Do this for both sides. Repeat for the Vacuum Actuator Relay
. A properly functioning component will draw and hold a vacuum.

Notes:
Small leaks add up!
Make sure you order the correct parts as the years and locations matter. Good luck and let us know if we can help you any more!

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to C3 Corvette Ask!.





















Enjoy this page? Please pay it forward. Here's how...

Would you prefer to share this page with others by linking to it?

  1. Click on the HTML link code below.
  2. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable.
Chris Trautman @ Corvette Assembly Plant 2019

About Us: Corvette Web Central | Owner Bio: Chris Trautman

Established in 2008 by Chris Trautman, Corvette Web Central quickly grew into one of the top leading Corvette enthusiast websites globally. 

"This website is a passion of mine, just as much as being a Corvette owner," says Chris.  He was frustrated trying to find information on the internet about Corvettes which was was not biased or influenced somehow. 

He has owned three Corvettes over the last twenty years and does not plan to stop owning one anytime soon.

Note: Some links on this page are part of our affiliate program and provide a small portion of proceeds to fund the administrative costs and to fund more product reviews.  We are not paid to perform the reviews or are we given any products for free.  

You might like these