Hello all again,

I did some more investigating, and it looks like the VCV valve is not holding much vacuum. It holds 5 in hg before it leaks down when tested off the car with a vacuum pump. After messing around with this my shut off system quit working as often, leaving me to pop the hood and manually stop the engine.

I decided to start over and check the vacuum directly from the pump by blocking off all other branches. It quickly read up to 20 in HG.

One at a time I decided to check the systems by adding one system at a time back to the main vacuum line and comparing vacuum pump down time. The climate control system seemed to have the slowest pump down (red/gr?).

With the car off I tested the key switch and it held vacuum and allowed it to pass by when on.

So my question is, typically how long does it take the car to build a vacuum?

Additionally, how hard it is to get to most of the climate control vacuum modulators for vacuum testing?

Any help is appreciated.

Thanks.

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1985 300SD 200K