Great info. in this thread! I now have working center vents. Thanks Arew.

__________________
85 300D (California) 220k
03 Silverado 1500 Xcab Z-71 Guzzler 90k Real American steel(made in Canada)
03 Suburban 1500 4x2 Guzzler 170k Real American steel(made in Mexico)
Diamondback hybrid
Element skateboard(mileage unknown)

Good news for diesel owners...There's no such thing as cold...only the absence of heat!

"Beer is proof that God wants us to be Happy." Benjamin Franklin

"Possession....the King of sin." The Avett Brothers

It's the one thing I'm really really good at on these cars...

Mostly because the PO (my older brother) would just kind of notice that the door locks werent working, that he couldnt stop the car unless he locked the doors first, and that the center vents had no air. He never fixed them, and half the vacuum system was trash when I started fixing it up... that was fun.

__________________
1984 300DT turbo 138k mi

Still hauling me to school and back.

Handy Site:
http://www.dieselgiant.com/

The symptoms in this thread explain my issue almost exactly.

Except that when I test the power going to the monovalve there is no current. I've used two different testers to be sure. I also ran a 12v current to the monovalve and managed to get ac blowing through the two vents near the windows but none through the center vents.

Now before I start tearing things apart, considering the power to the monovalve not existing, is there anything else I should look at or know?

Side note: I need to replace the vacuum control on the ignition and the door locks. Those are bad, I do have the parts for them.