Debugging defroster flap - W126
 

The flap is open all the time, so its a minor nuisance when the AC is on. So far I removed the vacuum pod and it holds vacuum at both nipples. There is no vacuum at either hose at any ACC switch position. The other vacuum pods seem to be operating normally. The hoses go down the inside right side of the console to someplace. What can I check next?

Found it. Its a solenoid thats burned out. No wonder too, its been getting constant power for the last 20 years whenever the car is on.