Worked on the vents last night. I ran over to harbor freight and picked up a mighty vac hand pump. I pulled the vacuum lines off the selector and checked each one by one. All held vacuum so my leak wasn't in the lines. So I plugged the head back in and went out to the track and pulled the main vacuum line and hooked up my pump. I had my wife run the pump while I was inside. The leak was coming from the vacuum selector at the back of the heater control unit. So I decided to take it apart and figure out what was going on. Of course the clip broke that holds it all together. The "seal" was a little hard but I cleaned it up and lubed it up and made up a small bolt/nut/washer setup so I could adjust the tension on the seal. I then plugged my vacuum lines back in and everything held vacuum. I was able to actuate all the flaps. So that's fixed!
