68 hideaway headlights - Team Camaro Tech
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post #1 of 9 (permalink) Old Oct 28th, 13, 06:34 AM Thread Starter
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Dan
 
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68 hideaway headlights

I have a 68 camaro with hideaway headlights. They have been working very reliably for about 10 years on a daily driver ( replaced light switch about 4 years ago). Recently this symptom started happenning, when starting the car the hideaway doors will open all the way then close. The light switch when operated turns the lights on/off and the doors open and close as they should. I did make sure my vacuum relay valve was in the normal position. when i operate the vacuum relay switch to open position the doors open as they should. I dont hear any vacuum leaks. looking through posts i have checked my hoses and put some silicone spray in the vacuum relay ports.

the symptoms are changing some as time goes on where the doors open on start up and are staying open longer before closing Thanks for assistance with this.

Dan

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post #2 of 9 (permalink) Old Oct 28th, 13, 07:20 AM
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Re: 68 hideaway headlights

Sounds like a vacuum loss as the system was designed that if you lost vacuum at the headlight switch the doors open. The splitter / check valve may also be failing. This is the part where the large line splits into the small line to the headlight switch and the large line to the reservoir.


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post #3 of 9 (permalink) Old Oct 28th, 13, 07:27 AM
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Re: 68 hideaway headlights

Also look at the traffic light service valve and the ends of the green and red hoses for cracks or splits.


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post #4 of 9 (permalink) Old Oct 29th, 13, 07:27 AM Thread Starter
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Smile Re: 68 hideaway headlights

Brian, thanks for your feedback i am narrowing it down to the light switch now as it is a repro unit and seems to bind when pushing back in to turn the lights off. maybe it is leaking vacuum within the switch and i just cant hear anything because its tucked up under the dash. thanks again i will keep you posted. dan

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post #5 of 9 (permalink) Old Oct 29th, 13, 08:15 PM
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Re: 68 hideaway headlights

"when starting the car the hideaway doors will open all the way then close"

You need vacuum at the control valve to open the lights
You cannot have vacuum to the top of the control valve to open the doors.

The vacuum source for the headlight switch is very close to the reservoir supplying vacuum to the control valve.

When starting the car you, basically have no or very low engine vacuum. Interesting your car will hold vacuum in the headlight system after it has been shut off.

This problem happens while cranking the engine? Or it happens once it is running?

I'm thinking out loud

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post #6 of 9 (permalink) Old Oct 31st, 13, 08:44 AM Thread Starter
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Dan
 
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Smile Re: 68 hideaway headlights

dale, initially it happened fast the car cranks right up i can hear the doors open then will stay open for a few seconds then close. lately the doors open on start up and then stay open longer for minutes before closing. the lights/headlight doors still work normally when i use the headlight switch to turn the lights on/off, although i notice a binding in the headlight(repro) switch when trying to shut off lights (pushing switch in to turn off). thanks for the feedback. dan

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post #7 of 9 (permalink) Old Oct 31st, 13, 08:25 PM
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Dale
 
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Re: 68 hideaway headlights

I believe you have a restriction in the vacuum hose going in and out of the light switch. I would visually check the hoses for kinks/ collapse. If they look good, pull off the hose at the top of the valve and the vacuum source to the headlight switch. Blow through the hose and feel how much restriction you have. Then divide up the system to determine where the restriction is.

There is vacuum at the control valve and none at the top of the control valve. That is the only way the lights will open with the lights off.. as long as the hoses are connected properly.

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post #8 of 9 (permalink) Old Nov 3rd, 13, 06:19 AM Thread Starter
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Re: 68 hideaway headlights

dale, thanks for the feedback i am on-duty working this weekend so unable to troubleshoot i will pick back up on this during the week and post my results. dan

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post #9 of 9 (permalink) Old Nov 7th, 13, 06:34 AM Thread Starter
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Dan
 
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Re: 68 hideaway headlights

Through troubleshooting methods recommended by the forum members i was able to isolate the vacuum problem to a leaky vacuum relay. I have replaced the vacuum relay with a repro unit from NPD with a 3yr warranty it all is working again. thanks again dan

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