The air in my car still wont change

[xsvtank]

i have a 98 gtp i still cant get my air to work (ac/heat) i hear it blowing and all the vac lines are connected. when i change the vents to either defrost or feet or body they dont change it stays exactly the same what should i do?

there is a grand prix being parted out close to me wat would i need from it to fix my air

Thankyou
Frank

[TheOtherNick]

The arm could have cam unhooked that moves the doors, not sure where it is on a gp tho, I think it is under the dash behind the center consul.

[xsvtank]

does anyone know where it is?

[egloskerry]

I had this exact same problem. Just fixed it. Most likely, your vacuum control valve solenoid is bad. It's the small grey box that all the vac lines are hooked to.

Part# is 15-72182 . I got it from AC Direct for $56 shipped.

If you're pulling it off another car, just follow the vac lines. It's screwed into the blower motor housing. You don't need the rubber manifold that the lines go into, just the grey box.