The Haynes Jeep Cherokee 1984 - 1996 book has 7 different diagrams which show how to do that repair.
There are many pictures of this on Google.
get a chilton guide book
I wouldn't replace it, just fix it. Check heatertreater.net for information on how.
There is no such part on a 1999 Jeep.
No, the entire dash has to be removed.
The temp control door is on a vertical axis on the Cherokee(XJ), and the control motor is on the bottom of the heater box under the passenger side dash. Check heatertreater.net for pictures and diagnostic information for this system.
The wiring connector is melted. Check wjjeeps.com for pictures and a solution.
Common problem. The heater grid burns a hole and the only fix is to replace the element.
BIG JOB Get a manual on your car from DISCOUNTAUTOREPAIRMANUALS/COM and it will have pictures and everything.
you have pictures and insruction which screw come first and last .
you need to replace your heater core take the heater hoses off and lope them with a piece of tubing and drive you will see what i mean
Not an easy task! Dash must be removed, ac discharged, HVAC housing removed and HVAC housing separated to replace heater core. Not for the faint at heart, but easy for an experienced Technician.