Oldsmobile/Buick Repair: Buick LeSabre Climate Control, vacuum tank, vacuum line

Question
I have a 95 Buick LeSabre with 106,000 miles and today I noticed that when I press any mode button on the climate controls, air only comes out of the lower center floor vent. The max, vent, bi-level, buttons will light up but air cannot be directed anywhere else. Slide heat/cool, and fan controls all work normally as does the "off" button. Yesterday I replaced the spark plugs, wires and serpintine belt, and have checked carefully under the hood to make sure I didn't accidently disconnect anything. I assume the air problem is just a coincidence. Any suggestions? Thanks,  Jim

Answer
Hi jim

Sounds like the vacuum to the control is disconnected,in the engine compartment look for any vacuum lines either disconnected or broken,also look for a vacuum line that comes from the right side of the firewall and goes to a vacuum tank,this vacuum line is what controls the modes for your climate control,repair the vacuum line and it should work,let me know.

ED