Light switch noise

[Tom Feramenti]

68 Camaro RS
Do you also have a vacuum hissing noise on the light switch when you turn it on?
or is it definitely defective?

[rare396bronze]

Should not hiss. I would check the  hoses that attach to the valve in the switch first. If the are not leaking then you have a problem with the switch. Hope this helps.

[David K]

Tom,
There are at least 12 different places that noise can be coming from. However, if you can hear it while inside the car and not outside, I would suspect the headlight switch has a hose that has split. Easy fix. Same with all the other hoses.
Do he doors open and close ok?
Is one slower than the other?

[Tom Feramenti]

Thank you!
I'm currently putting it together. The lamp motors only run when I switch the valve.
Based on your expertise, I suspect that a hose on the light switch is leaking or the light switch itself is defective.

[JST69Z28]

An easy way to check out any vacuum operated system for leaks is with a smoke machine.   You can plug (or T it) it into any hose in the system, turn on the smoke, the entire system gets pressurized, and the leak (or leaks) shows up quickly.  It produces less than 1 PSI, so nothing gets hurt.  Most auto repair shops have one, so if you have any problems finding your leak, it can easily be checked.

[David K]

I would pull the switch-should take about 5 minutes. You’ll be way ahead by removing the left.

[Tom Feramenti]

Thanks, I'll report back

[Tom Feramenti]

I applied light air pressure to the line and it got lost at the switch. I installed a new one, thanks

[David K]

So is it fixed?

[Tom Feramenti]

Yes it works good. would like to load up a small video. but how?