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The heater core in this vehicle is replaced by removaing the entire dash (which includes lowering or removing the steering wheel), removing the evaporator/heater case (a large, plastic box mounted against the firewall behind the dash, opening the case, removing the old heater core, installing the new one correctly and reversing the procedure. This procedure also involves interraction with the airbag system which is not only delicate, but potentially dangerous. I would highly suggest bringing this type of repair to a shop that specializes in A/C and heating work (generally not a general repair facility). P.S. Depending on milage, age, how long you plan on keeping your vehicle and your budget, you may want to have the A/C evaporator replaced at the same time, as replacement of the evaporator is also in this location and requires the same procedure. It would be a shame to have the evaporator fail (a common problem on Jeep Cherokees) at some point after having just paid to have this job done. Regardless of whether or not the evaporator is replaced, be sure to have whomever is doing the work to thoroughly clean the drain area while the case is out of the vehicle as this is another problem are on the Cherokees.
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