No heat to the footwell made me test its pod. It is ok. However, there's no vac to it and center flap from the controller.

Re 124 Repair Manual [2CD] 83-620 Checking Flap Control
A4 Testing the check valve: Vac slowly decreases
A6 Testing vac reservoir: Won't hold any vac = either bad reservoir or line to it.
B3 Testing line from firewall to Y7 Switchover controller: Won't hold any vac = either bad controller or line to it.

How can I access the Switchover valve [Y7] to test its vac? From CD Repair Manual [83-600] I know its location, but there's isn't a glove box to access it because there's a passenger airbag. Will removing the bottom panel in the passenger footwell allow access without fear of the airbag deploying?

What's the chance that the Switchover controller is bad?
Does the vac tube to it go accross the top of the dash or lower near the climate control push button controller?
Am I correct in assuming the push button controller won't affect these vac tests?

Bob
PS Happy New Year