69 Headlight Doors

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Oct 28, 2019 | 05:07 PM

sjstub

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Joined: Feb 2017

Posts: 62

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From: Cape Coral Fl

69 Headlight Doors

Having a hard time getting enough vacuum to either raise or lower both headlight doors. I can do 1 door at a time after disconnecting 1. What are the possibilities for the weak link in the system? All new hoses, checked & rechecked for proper connection. Oiled all points on the hdlt ***'y. Replaced check valve, filter, hdlt swx... Any ideas out there?

Oct 28, 2019 | 06:09 PM

Peterbuilt

Le Mans Master

Joined: Aug 2006

Posts: 7,426

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From: mount holly NC

2025 c3 ('74-'82) of the Year Finalist - Unmodified

2019 C3 of Year Finalist (appearance mods)

Many times the 'grommet' seal in the actuator needs to be replaced.

Here's a good 'How-to' to help you check each component.

http://www.corvette-101.com/vacuum.htm

Oct 29, 2019 | 02:12 PM

kodpkd

Le Mans Master

Joined: Jun 2019

Posts: 5,479

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From: Loveland

There is a great DIY on YOUTUBE, how to rebuild the actuator.

Oct 29, 2019 | 03:17 PM

L-46man

Melting Slicks

Joined: Feb 2017

Posts: 3,232

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From: PHX AZ

Just going to the fundamentals here....what vacuum are you getting at the manifold port at 750 RPM??????

Oct 29, 2019 | 09:11 PM

sjstub

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Joined: Feb 2017

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From: Cape Coral Fl

Thanks...I'll take a look at it.

Oct 29, 2019 | 09:12 PM

sjstub

Thread Starter

Life Member

Joined: Feb 2017

Posts: 62

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From: Cape Coral Fl

8 at best. Usually 5-6. Running a Hi-performance Comp Cam

Oct 29, 2019 | 11:18 PM

Joelbbvette

Pro

Joined: Jul 2007

Posts: 587

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From: Tampa FL

I had slow action on my 72, checked the seals on the 2 head light actuators and the wiper door. After ruling those out, I needed to replace the controllers. That solved my issues and from super slow they now slam up and down. That is with all original hoses. So food for thought. One step at a time and start with the cheap parts and a brake vacuum pump really helps.

Good Luck
Joel