I took apart the dash in my 1987 300TD and replaced two vacuum pods with NOS units and rebuilt the others with the kit sold by Performance Analysis. I also replaced all of the little rubber connectors. Using my Mity-Vac, I'm able to draw vacuum at the glovebox manifold, firewall, and five-way tee in the engine compartment (with the Mity-Vac pointing towards the passenger compartment). However, with the electricity on or with the car running, the HVAC control buttons do nothing to change the direction of the air. The defroster flaps are open all the way and the center flap refuses to open. Swapping out the panel with the control buttons did nothing to help.

Any thoughts?

Many thanks,

Corvo Gold
1987 300TD, converted to manual shift