300sd center vents

[Paulc66t]

Can anybody tell me when the center vents in an 83 300sd should be on? I just got the AC working and thought it would blow out from there. It seems they don't get used for anything or are non functional.How do I check them. Also what is the function/purpose of the center vent in the rear console. It seems to blow outside air in and also maybe AC?

Thanks,
Paul

[jap]

the original car manual will tell you all these things specifically in the climate control section.

from my memory and experience, the center/rear consoles have to be opened with the sliders, then depending on the selection on the climate control thing, the (which means economy) blows non-a/c air, and the rest activate the a/c, except the and the (far left button). Heat should not come out of the rear console, only fresh or a/c air.

[carnut]

Heat should never exit the center two vents, just fresh air on econ. or refrigerated air in auto. You probably have a vacuum pot not holding vacuum or a vacuum switch electrically failed.

[SD Blue]

Originally Posted by Paulc66t

Can anybody tell me when the center vents in an 83 300sd should be on? I just got the AC working and thought it would blow out from there. It seems they don't get used for anything or are non functional.How do I check them. Also what is the function/purpose of the center vent in the rear console. It seems to blow outside air in and also maybe AC?

Thanks,
Paul

You should get fresh air and a/c from the center vents and the rear console. If your dash center vents are not working, I would suspect the vacuum pod for them is leaking. Here is a post discussing this: 300SD Climate Control