w124 climate control

[dablk1]

Hello all. This particular problem is occuring in a 1993 300E. It's a friends car and I'm trying to help him out. First, the blower motor itself is fine. I checked it myself in and out of the car. Now the big issue is the fact that no air at all is coming out of any of the vents when any button is pushed on the CCU. He said that it use to work just fine and suddenly it just stopped. I was leaning towards the pods when he initially told me about it, but after reading quite a few threads it seemed unusual for all of the pods to go bad at the same time. Could this be caused by a faulty CCU? Another reason I was thinking that it might be a vacuum issue is the fact that his door locks are inoperable. They key won't turn the drivers door lock in either direction. Any suggestions??