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the cab heater fan?, there can be 4 fans on some cars. front condenser, 2 on rad, and 1 in cab heater box. the cab fan? does it fail on high too? it has a switch, (marked fan speed) the switch is bad ,if low speed are dead. and high are good. or wiring to it , the motor or the fuse. even a cracked fuse, change the fan fuse to a new fuse.
Check the blower motor under the dash.(on right side put a 12v lead directly to the connection and if it works, the problem may be in the switch relay or resistor pack. (i've also heard of debris holding the fan from moving so if there is power there and motor does not run, remove & check first before buying a new unit.)
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.