heat comes from the floor and vents only

[slb1985]

I do have heat in my 87 with ac but the slecter switch isn't changing where it comes from I checked the rod on the box behind the glovebox and I can't move it with my hands I also checked the back of the selector switch and I don't have vacuum there but don't know if and when I should I also checked the little thing by the gas pedal and no vacuum there

Any thoughts on where to start to get it fixed...
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