'87 300SDL ACC problems (minor?)

[WANT '71 280SEL]

I did a search and I believe I answered the first of my questions, but here it goes.

Of the 3 times I've used my A/C this past week, I have only gotten air out of the center vent once. A search made me believe this is the vacuum pod behind the antenna radio. It was my belief that when they fail they always blow air out the vents rather than vice-versa.

Secondly, I am having a problem getting a high speed from my blower motor. When I was using the A/C I turned the wheel to "min" and the fan hardly goes above the middle speed. Then, tonight I tried to use the defroster to get the car heated up since it was cold outside and didn't blow hard until I had been driving for 20 minutes. This happens to me almost all the time. If it is in auto mode and I push the "max" speed mutton, the fan hardly turns up the volume. Sometimes it will blow hard like it should after awhile of running, and most of the time it won't. Do you guys have any idea what this problem could be?

I have to say that my ACC puts out the right temperatures in that it blows cold when calling for A/C and puts out good heat when told to do so, it's just the fan speed that's messed up.

Thanks
David

P.S.
How do I remove the wood piece above the radio so I can replace the pod? I don't see any screws and I know it has two "J" shaped hooks at the top...