Blower motor jeep cherokee 1993

First. Check fuse then check blower motor resistor that not it you probably have bad blower motor

blower motor resistor.

you have to check vacuum canister and vacuum lines. when a vacum line is cracked or canister has a crack you cant control air directing doors in hvac system, becasue engine creates vacuum and this canister is connected to vacuum lines and you can only control hvac system when vacuum exist on electric panel equipped Ac systems, you do not need vacuum to control blending doors. there are electric motors.

Sounds like a VAC. Line came off or is cracked, a vacuum leak causes the heater to go into default mode( defrost ) for safety reasons...

You will have to test those parts to see which one is bad......either that or replace both parts, one at a time, and hope you get the right on, on the first try. Also, when the blower resistor goes bad, it usually still works on the highest speed but not any others.
BTW, has anyone tested the actual fan blower motor, to see if IT might be bad?

may be a bad blower motor resistor

Per your description it would appear the blower motor has failed. Have you checked for voltage at the motor and the motor ground ?
Let me know.

If it won't turn the motor over it's probably the starter motor or battery Also check lead connections are clean and tight

Mate.Its not that hard.Disconnect the battery.Unplug the fan connect wires.Oh.This is all in the engine bay.There is 3 screws that need to be taken out around the mounting plate.Now you can remove the fan motor.I hope this helps

Replace your blower resistor located under the passenger side dash.