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My experience is with my 95 Grand Cherokee Limited and it may not apply completely to your 01 but:
Jeep Cherokees are constructed with a unibody as are many cars. This means there isn't a frame underneath the vehicle. Vehicles with frames and most unibody constructed vehicles have a rubber tube that exits the evaporator at a low spot and drains condensate onto the ground. The evaporator pan can get mucky as well as the tube in these vehicles and its a simple matter of finding this tube sticking out underneath and blowing compressed air up it which would be a cheap and quick, although not thorough fix. Jeep engineers, in their infinite wisdom, chose to run the condensate into a unibody rail directly from the condensor box and therefore there is no tube to blow out and no way to clean it other than to dismantle the box. On my 95 we find that the condensor box is half in the engine compartment and half in the passenger compartment very low on the passenger side under the carpet almost. Inside the box is a thin formed styrofoam liner that is supposed to prevent moist air from condensing on the outside of the box in the passenger compartment and making the floor wet. The trouble is that this liner disintegrates after just a few years which adds to the muck that accumulates in the box. You may even see what looks like pieces of styrofoam cup in the dash vents. This is bits of that liner that were blown up into the ductwork of the car. They also can clog the mechanisms that direct the air from the dash to the floor etc. The correct fix involves dismantling the complete dash to extract the box, take it apart and clean the system and replace the liner. I've gotten quotes from reputable repair places ranging from $900.00 to over $1300.00. Most of this is labor. The styrofoam liner costs about $80.00 (for about 10 cents of styrofoam) and barring any other problem should be the only part you'd have to buy.
There are any number of "how to" articles in these forums concerning this as well as several "work arounds" that involve drilling a new hole in the bottom of the box and running an alternate drain. Should you decide to get the drill out and perform surgery be aware that the evaporator coil is very close to the inside of the box and it would be a very expensive mistake to drill a hole in the coil. If you decide to dismantle the dash it might be wise to have a second back up car to drive for a week or so while you puzzle out all the parts that make up the dash. Remember that my experience is with a 95 and not an 01 but I'm willing to bet that the basic design hasn't changed much over the years. Good luck and please post any new information that you may come across as you deal with this issue.
AnswerBlow compressed air through drain from inside heater box.
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∙ 12y ago
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www.sgarlic.com/jeepsite/heatercore.html
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