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Answered 2011-09-13 15:04:07

This also happenned on my Liberty. It was not in the switch or in the fuse box, a part needed to be replaced by the dealership.

Addendum: That might have been the fan speed resistor block that they replaced.

Ninety-eight per cent chance that was the fan speed resistor. I bought one on eBay for $27 and replaced it in about 10 minutes. You need to drop the glove box by pushing in the holder clips. Inside you'll see a part with several wires held to the heater housing by two bolts. Remove the bolts, turn around the assembly, and there's your resistor, ready for replacment. Piece of cake.

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