Has anyone ever had that crazy squeaky window on the passenger or driver side. I had my car serviced at the dealer and they stopped the noise for maybe 2 weeks before it came back. I gave up and just let it squeal until one it I tried to lower my passenger side window and all I heard was Crunch, Crack, Pop. No more more power window. I took the entire system apart and found my issue. Here are the Pics. Despite what everyone has been told, I tried the Gummy fledge and other non petroleum based lubricants, it was just a rusty cable. The Cable finally snapped and I had to buy the entire unit. The Dealership quoted me $350, but i got it from BavAuto.com fir $180.
Here are the last pics, I hope this helps everyone out. I don't often do this but I figured if it drove me this crazy I think of the BMW Z4 owners need to know how to fix it. The last pics is the new window assembly, it does not come with a motor so just swap your existing one across, its just 3 fasteners.