[PrimaDude]

My 69' RS/SS Vacuum doors are not functioning. I replaced the vacuum switch near the tank. I have verified the doors will open and close with gentle air pressure directly to the hoses that work the actuators (I know it's supposed to be vacuum but I have no way to produce vacuum as a test other than running the engine).

I do not believe there is a leak in the hoses. I have noticed that the vacuum tank is not holding much vacuum as I can hear the vacuum pressure release when I pull the hose from the tank. When I connect the vacuum line directly to the tank it has plenty of vacuum pressure so the tank is good.

As a test I have bypassed the hoses to from and to the light switch and connected the hose directly from the splitter/check valve to the T-connector going to the tank and switch. Once it is all hooked up properly there is just not enough vacuum pressure to do anything.

I am going to do a final test conecting hoses just to one actuator and bypassing the headlight switch.

I am spinning my wheels here. Can anyone help me out with any troubleshooting ideas?

I couldn't figure where to post this article so I hope it's OK posting in the engine section.

Thanks,

Joe

[KULTULZ]

I couldn't imagine doing a diagnostic routine on this system without a vacuum pump and gauge. Both can be bought fairly cheaply. MITYVAC makes low cost units.

It will either be a bad vacuum cannister, hose somewheres in the system, or defective hdl switch.