I have read hours of posts and have diagnosed my problem but still need some help on my '83. Perhaps PSFred or some of you that understand this problem might assist me.

SYMPTOM: I loose vacuum with the acc dial turned to heat. Door locks cease to function and car won't turn off.

DIAGNOSED: In taking out the center "push-button" control unit I found several leaks.

1. Three of the five buttons (the 3 on the right of the horizontal panel) leak so bad that I can hear air escaping from them.
2. When I push the 4th button to the left (solid air up and down), the leak stops and all vacuum fuctions of car return.
3. If I rotate the dial back to blue, all vacuum leaks stop no matter what button is pushed.

QUESTIONS:
1. Are the dial and three buttons bad?
2. I don't understand servos and what they are? (I'm fluent with door lock actuators and the use of my precious mighty vac. Are the servos similar?)
3. Can these problems be addressed without taking out the dash?

Thanks

Don

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