I too have the same 2006 Jeep Liberty, 47,000 miles, and both my rear window regulators have gone bad. The worst part is I NEVER USE THEM!
The first time the vehicle was under warranty so parts and labor was covered, today it was not. I had to put up quite a fuss by calling Chry. Customer Service at 800-992-1997 and state my case. Chry said they would pay for everything but a $50 dollar co-pay. I have the same story as everyone else. The dealer and Chry customer service all admit that the 2006 Jeep Liberty window compressors are faulty. The problem is not enough people nation wide have called to complain about this so they won't issue a recall.
I urge you to call 800-992-1997 to state your case. The dealership told me they have replaced all 4 window compressors 2 times in 12 months for many of their customers.
Our Jeep Liberty '06 just had the rear driver side window do the same thing... 50,000 miles on it. As a longstanding Jeep owner, I hope customer service shows customer appreciation.
I've had the same problems with my 2006 Liberty. I found a seller on eBay that sells a repair kit. that replaces the broken plastic piece with metal with instructions for around $100 dollars. And it will last. That plastic piece that breaks is most pathetic thing I have ever seen. A dealer will sell you the whole regulator with the same plastic piece that will strip out again.
2006 Jeep Liberty, rear passenger window regulator out. I only have 49,000 miles on mine and hardly ever use the rear windows. Appears I am not the only one, and will have to do the same as everyone else, bit the bullet. I did find a kit to fix the problem with steel parts at http://www.steigerperformance.com/dif.cgi?SP13001
I had the same problem with my 06 Liberty, the regulator broke in a window I don't even use!!! Pretty bad - luckily I've only had one go and it was done under warranty.
I have a lease and was going to buy it out, but will probably return it just because I don't want to deal with this problem again...