My 2000 Ford Taurus will not blow air from the front or foot vents, only the defrost vents work. HEAT & AC not working either

Sounds like you have a bad heater core..... make sure you watch the temp because that is mist of antifreeze you thinks is condensation.

also im pretty sure that's a vacumeline bad or not on that switches from panel to defrost to floor ect... I would take it back to who put the motor in for that issue because that's where it came from.

Jjmtuttle the problem existed before we replaced the engine. The heat and air hasn't worked in 2 years but we had a 2nd car so it wasn't a priority to fix. Then the transmission went a year & a half ago, then December of last year the coolant system & engine went. So it wasn't caused when the engine was replaced & the car hasn't been over heating

if your heater core is plugged the coolant wont flow correctly you will not get heat ....hence the coolant system and engine going out last year. I would start with looking into heater core then maybe seeing if the ac just needs recharge might have nothing to do with the other issues. the switching from panel vent to floor and defrost could be the switch or vacume line I suspect. hope this helps..

What vacuum line would that be

-99 Ford Taurus SE dohc wagon