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Welcome to Just Answer Jeep my name is Mark.
Do you have the manual temperature control system......or the automatic system?
Great thanks. The blower motor on the auto system is controlled by a blower motor control module. The blower motor power module is mounted to the rear of the HVAC housing, directly behind the glove box.
It sounds like you have a failed module and it can be accessed for service by removing the glove box.
Fuse #1 in the underhood fuse box. It's a 40 amp fuse.
Separate the glove box damper rod from the glove box by sliding the rod towards the rear of the vehicle to release it from the bin.