No matter what option I choose on the ECC unit (Upper, Lower, etc) air flows from all vents. There is a click sound when I change the direction but still nothing happens. Any thoughts/advice?

Thanks

Some idea of what car is doing this might help.

Its a 1995 Olds 88 LS. I had that posted in my sig line but it didn't show on the first post. Sorry about that.

Being a 95 your system should be similar to ours. Give some of the diagnosing a try in this thread. There'* a great link on page 5 that explains once all other things have passed that you may have collapsed nipples in the vacuum lines.

http://www.bonnevilleclub.com/forum/...ighlight=vents

No doubt just reading that will keep you busy, it'* a great thread though.

Ok, thanks. I'll check that out.