My blower control stays in defrost mode even while turned to dash or leg vent. I recently changed my plugs but I don,t see any loose wires or vacuum hoses that might effect this. Could I have done something under the hood to cause this?

Which vents, floor--defrost--dash? Can you hear the blower motor running? The squirrel cage could have broken loose from blower motor? There could be an actuator problem under the dash? If actuators are vacuum controlled and vacuum is lost, it might default to defrost, only blow out defrost vents.

COULD BE BLOWER MOTOR OR RESISTER

Yes , there are vacuum controlled doors behind the dash in the heater / AC assembly that control where the air is directed to . They are controlled electrically by the solenoid module ! You could have a bad solenoid , a leaking vacuum diaphragm or hose , the control panel could be bad ! You would have to take part of the dash apart to get at the components or all of the dash ! This is not a job for the faint at heart ! To me , no big deal . I have done several . Pull the lower right side insulator panel an listen for a vacuum leak while operating the system ! Pull the control head an do some electrical testing at the wiring connectors on the back ! You need a wiring diagram to know what wires are for what ! You can pull the glove box out an see the solenoid module ! It will have vacuum hoses an wiring going to it ! One more thing I have seen is objects down inside , pencils etc... from the defrost vent . blocking the door from moving ! You would need to pull the whole heater assembly out an take it apart to fix this !

check wire on vacuum lines behind the radio may of gotten loose it sounds like the control for heat and cooling are unpluged.

MODE SELECTION IS VACUUM OPERATED. DEFROST AND FLOOR ARE A DEFAULT MODE WHEN SYSTEM FAILS. YOU HAVE A VACUUM LEAK, FAULTY VACUUM SWITCH ON DASH CONTROL UNIT OR A BAD VACUUM MOTOR IN DASH

Your problem with the blower motor only running on high is caused by a defective blower motor resistor pack. Replace the resistor pack. The problem with the vents is not related to the blower motor, and is caused by a problem with the vent controls. I suspect you have a vacuum leak under the dash.

Air will only come out of the defrost vents on the dash i assume? The defrost vent is the default position when the system looses vacuum. Under the hood look for a broken or disconnected vacuum line on or near the engine in the area of the passenger side of the firewall. You may even hear the a slight "hisss" indicating a vacuum leak. Reconnecting the line to the appropriate port will restore proper vent operation.

you have a vacuum leak check the vacuum hoses behind the controll panell

most fords control the vents with vacuum and if it looses vacuum the default mode is defrost. so check the source coming from the motor(sometimes its a electric pump but i think it will be feed form the motor for you) it will most likely go through the fire wall on the passengers side also there should be a resivour under the dash some where. you will just have to find the vacuum supply line and locate the leak.

it sounds like you had the same problem I had a while back. There is a couple of "doors" on the blower motor that sometimes get stuck or broken, I took my jeep into an offroad shop and they fixed it with spare parts. They assured me that even if you took it to the dealer it's only like a 15-30$ part but it's the shop time that will kill you.