1989 760 Turbo AC and heat - no air from vents

First the obvious, are the vent dampers open? They're the oreo cookie things, some people don't realize what they do.

If that's ok, I'd start looking for a vacuum leak, the main dampers are vacuum operated and they close with no vac.

Many thanks. Your solution sounds logical. I'll try to have a vacuum leak found. Also, where are the main dampers?

They're burried behind the dash in various places. They're vacuum servos, like miniature versions of the cruise control servo under the hood. Usually the problem is the vacuum resivoir behind the bumper, you can ask Jamie about that, he knows all about it.

The early 760s had a climate control that was entirely vacuum operated and a nightmare to work on. I think yours has the later electronic version which is not as bad, still wouldn't hurt to check all the fuses though, IIRC there's a bunch of solenoid valves that control vacuum routing.

Wish I had 1% of your mechanical acumen! Thanks for the counsel. I'll get on it. George