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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:
When the blower fan will only work on high speed setting this means the fans speed control resistor is burned out, when it fails the fan defaults to high speed only. The fan resistor is located next to the fan and held into the cooling air duct by 2 screws near the blower motor. The part is fairly cheap and easy to replace.
Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...
Sounds like the fan control knob has shorted out. You can check the fan "blower" relay and fuse in the engine compartment but you need to make sure the control knob is good or you will keep blowing fuses and relays. If your blower fuse and relay are good, then just have the control knob checked and replaced if needed.
Alot of people have the same problem with the fan switch and blown bulbs. There really is no fix for this. Jeep really screwed up when designing the heater control assembly. The cheapest solution is to buy another unit off Ebay. Can always go to the dealer but be ready to PAY for there mistakes.