Is it possible to "activate" the vacuum systems without the car running?

[Michael L.]

Guys,

I'm in need of accessing both the headlights and wiper arm areas to finish installation of various items but the car isn't running. I'm reluctant to use brute force to open these things for fear of damaging something. Also, I wanted to test various systems, like HL, WSW, and heater controls prior to completing installation of the interior. Is it possible to attach a vacuum pump to the system to make them operational until the car is running? What would be the effect of applying vacuum to things like the headlight actuators and WSW actuator? Would these things simply pop open? Thanks for any help.

Mike

[Patrick H.]

Re: Is it possible to "activate" the vacuum systems without the car running?

You can do it by applying vacuum.

However, the headlights are moderately easily opened by pushing from below. If you stand on your head you can see where to push.
In addition, the wiper door can be raised by removing the black plug (don't do this with a 50 year old rubber plug; it may tear) and pushing on the inner mechanism with the eraser end of a pencil.

[Edward B.]

Re: Is it possible to "activate" the vacuum systems without the car running?

I got one of THESE just for this.

Ed

[Mark E.]

Re: Is it possible to "activate" the vacuum systems without the car running?

I recommend getting an electric vacuum pump, the type used for evacuating AC systems. They're about $50.

They're great for checking the integrity of the vacuum system and finding leaks. With the engine off and ignition on, connect the pump to the system's vacuum source at the intake. Use a long vacuum line to locate the pump away from the car (preferably the other side of the garage door) so you can listen for leaks. I like to tee in a vacuum gauge and keep the system at about 12' - 15" hg to simulate normal engine vacuum. If you hear a leak, pinch the lines at various locations to pinpoint it. Leaks are typically at hose connections, check valve, or in the relays and actuators themselves.

Another test: Turn off the pump and see how long the system retains vacuum.

[Michael L.]

Re: Is it possible to "activate" the vacuum systems without the car running?

Thanks Mark. I'll pick one up.

Mike