My 97 dodge ram has no air coming from ac/heat vents in dash except for the top vents next to windshield. no air coming out at all of any kind all across front of dash.

Does the blower motor work? If not check the blower motor--wiring circuits--fuses.

If it blows any air, defrost--floor--front of dash? Maybe a problem with actuator under the dash.

Do you see antifreeze dripping or a fogged windshield? If you do, it's a probably a leaky heater core.

The flap that directs the airflow between your front defrost and those Center vents sounds like it is become disconnected from your control

Possible bad blend door actuator .some gm cars can be relearned to the new climate control head

Check taht the dash controls are moving to the selected option.Check for broken cracked vacuum lines to actuators for vents

Mode Door 1.
a.This door regulates air flow to either the dash vents or defrost/floor. If you have air flowing only through the vents with no defrost or floor, this door is failing. From our experience, this door is usually the first domino to fail. Not sure why, just is.
<!--[if !supportLists]-->4.Mode Door 2.
a.When mode door 1 is set to divert air away from the vents and into the second stage of the system, door #2 chooses whether air goes to the defrost vents to the windshield or out through the floor vents in the passenger and driver's side footwells. Failure is indicated by an inability to choose between defrost and floor.
b.This door turns out to be the most difficult to replace. In order to replace the door, the dash panel has to be removed. It's still better than the dealer fix because you don't have to evacuate the AC system, drain the radiator, and remove the plenum box. But it is more work than the other fixes. When this door breaks, it falls in the down position, blocking the floor vents and diverting all air through the defrost vents. From a safety standpoint, this is good since you'd most likely rather have a clear windshield than warm feet. We suspect that a large percentage of customers will just leave this door unrepaired. You will have heat through the dash vents and to the windshield, just nothing to the floor. It's inconvenient, but you'll have to make the determination if warm feet are worth the extra work to fix the door. An extra pair of socks is easier.

This is a social web site like face book,can't help

The salvage yard is the only hope you have

Dealer usually look for old stock around the
country.could take a couple weeks,if it's out there

There is a actuator on the right side of your leg while sitting in the drivers seat under the dash. It has a plastic rod for actuation manually actuate this diverter and should be the problem.

most likley you have a vaccume leak somewhere but also the linkage to the door that that directs the air flow may be in a bind. another possability is the hvac controlls. hope this helps

You have a vacuum leak. Engine vacuum is used to move the doors that control airflow for the heat and ac.