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check radiator fluid level it take hot radiator fluid to pass through the heater core to produce the heat in your car VIA the fan. also check or replace your thermostat it could be bad and stuck in an open position thus radiator fluid not getting hot, no hot fluid no hot air the other problem sounds like a duct hose under you dash has come loose locate and reattach.
I doubt if you have a fan problem. More than likely you have a bad actutor motor. There are 2 small electric actuator motors under the dash. The temperture door actuator moves the air temperature door, which controls the temperature of the air coming from either the a/c or heater vents. The mode actuator (which is probably the one you hear clicking) controls the mode of operation, or more simply, which vents the air will be coming out of. When the internal gears of the mode actuator fail and start slipping, they make a loud repetative "clicking" sound, which is what you are hearing. Another symptom that may or may not accompany this situation is a longer than usual wait time for your mode selection to occur. So to sum up, a loud repetative clicking sound from the center of the dashboard possibly accompanied by a longer than usual wait time for your ac,heat or defrost mode to occur, usually indicates a failing mode door actuator.
If you cannot change the air flow from the heater vents, defroster vents, to dash vents, etc. as your control switch indicates the problem could be a loose vacuum line. It could have come loose from the engine under the hood. If not you will need to remove the control from the dash and check for vacuum at the control. If you have vacuum there you will need to replace the switch,
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.
It sounds like you have a vacuum problem. When the engine is running it generates a vacuum in the exhaust manifold. That vacuum is used to move the actuators inside your dash to the position you chose with your controls. If you have a vacuum leak or something interrupts the vacuum, the actuator will move to its default position which is the defrost vents. It sounds like the act of accelerating is somehow interrupting the vacuum. I'd look for little cracks in your vacuum lines and check your ERG valve.
It may be the mode actuator. Have you heard any clicking or other strange noise ? Under the drivers rear seat, in a plastic box is a fuse panel. Remove the two retainers, and the cover. Remove the HVAC or A/C fuse for a minute or two. Reinstall the fuse and this will make the A/C system relearn. Whwn you put the fuses back do not touch the A/C controls. Start the truck and leave it run for two or three minutes. Then try to change the vent from floor to vent and defrost. If this does not work you will need a mode motor. Good Luck
If they are stuck on defrost,then the problem is a little vaccum line that comes through the firewall as all the climate controls are vaccum controlled,so look for a small green or black plastic line unhooked.
Have you checked the diverter doors under the dash??
It sounds like a vaccum hose may have fallen off your vent controller.
I have had similar problems and found that the air WAS moving, but it was all going up through the defrost vents at the windshield.
A quick check of the vac. lines showed that one under the glove box was pulled off.
with the engine running, try setting the air settings to all the options ( vent/floor/defrost..etc..)
See it you can feel or hear the diverters moving under the dash..