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If the blower worked, but couldn't get cold air, there may be a leak of refrigerant in the A/C system. If you're complaint is about the lack fan-forced air; that could be a problem with the fan speed switch or a bunch of other places. Most often however, it is the speed control resistor. Have a look at this thread to learn more about it:
Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door. The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents. When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear. You can do an internet search for "repair durango blend door" for more info.
The HVAC mode selections on these are controlled by an electric stepper
motor that receives commands from the BCM (body control module). The
BCM decides where the air door should be by looking at where the dash
control input is.
Each mode selected has a different resistance level. From low
resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost,
with Defrost as the highest resistance (~100K ohms). A high resistance
or open circuit would probably default the system to defrost no matter
what position the mode control was set to.
If the control is dirty or there is a connection issue, this could
cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The
system can be reset and recalibrated with a battery disconnect, this
will also erase any fault codes.
I would start by looking at the dash mode control.
Check the vacuum hose going to the heater control valve,it may have popped off. If that is on. check the vacuum hose going to your recirculation door under the right side of your dash. I hope this helps.
Sounds like a card located under dash behind your blower motor, on passenger side.When card starts going bad you will only have off and high (for awhile), then none. change the card, this thing controls your speeds on the motor at your control on dash. I have a 2002 Dakota had same problem... but keep in mind not all Dakotas have this card.
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