1997 Ford Taurus No Heat or Defrost. Really need HELP!

The heater will start out kind of warm and turn cool in about a minute. The same thing with the defrosters. If the heater is allowed to turn cool and then switched to defrost, the air starts out cool and stays there. If the temp control is turned to the cold side, the air will get cold. But when it is turned back to the hot side, the air remains the same temp as the cold side. My wife tells me That if she puts it on vent, it will eventually get somewhat warm.

What has been done.

Cooling system flushed one component at a time. The heater core was fed a strong stream of very hot water. It immediately came out of the other tube. It was allowed to run until it was clear. The same thing was done to the block and radiator.

New water pump was installed. The old one wasn't rusted out or leaking but I changed it anyway.

The by-pass hose and all hard lines were flushed. A new thermostat was installed.

With car at operating temp, I used an autozone laser thermometer on the heater hoses and by-pass hose. According to the thermometer, both heater hoses were sitting at about 185-190 and the by-pass hose was at about 200. Both radiator hoses are very hot to the touch.

The blend door actuator was observed and it appeared to be operating fine. I replaced it any way. No change. While the actuator was off, I worked both heater damper doors by hand. Still the same temp.

I REALLY need you guys on this one.

I can't afford much this time around. I'll make up for it later. Thanks