My heat/ac won't blow in the upper ducts

[Kage]

So...

My heat/ac won't blow in the upper ducts, as the thread title says. I can turn it on and off, but I cannot adjust it to the various other areas. I believe the switch is fine (I can turn it to AC or Max AC, off, etc.), but it will not adjust what ducts it blows to except the floor/defrost or defrost-only.

What exact parts are at fault for this?

[iceracer]

Have you recntly installed an after market system? The doors that control the air flow are vacumn controlled. The selector control has vacumn lines attached to it. There is a vacumn storage tank under the dash and a line from the intake manifold goes to the tank.

[Kage]

Not yet I haven't. I bought it like this. I thought it was electronically controlled? When I took my DIN panel off to install my new head unit, it only had wires attached to it as far as I remember.

[03zx2]

You could of possibly ripped them of pulling the old hvac unit.Pull it all back out and double check.

[mellowness65]

x2 on the check connections on the back of the plate

[iceracer]

A common occurance. There are wires and vacumn lines on the control.

[Kage]

Will check, thanks. I'll let you know how it goes.