My mom's 1997 Oldsmobile Regency won't put out air through the dash vents but it does at the top near the windshield and at the bottom and sometimes it won't even kick on at all until we d

SOURCE: there is no air blowing out the vents on the dash board when i turn the ac on

you have a bad control unit, the thing you use to switch from one thing to the other, it needs to be replaced.

SOURCE: Air won't blow through dash vents under acceleration

there should be a vacuum line running by the drivrs side shock tower that might be unhook are cracked

SOURCE: The Air flows through only the defrost and feet vents

Inside the ventilation system there is gates that open and close to direct the air flow. These are operated on vacuum on most vehicles. The hose for that perticular gate may have disconnected somehow or has a hole in it. I suggest you take the heater controls out and see if there is a plug with a series of colored hoses on it. it so you'll have to trace each of them to see which one is the problem. Now you may be able to get some help from you local dealers mechanic who just may know the color code for that gate. (which would be a bonus) Good Luck

SOURCE: The blower motor on my 1993 Oldsmobile 98 Regency

You need a blower motor resistor.

SOURCE: Heating/Cooling air not coming out of dash panel vents...

Vaccuum hose has come unattached at the firewall that regulates the baffles in the ductwork. Look for a leak or unattached hose.