Cleaning/lubricating the window guides is also part of the regulator replacement job. Clean with a toothbrush & bottle brush & mild mix of all-purpose cleaner. Lube with silicone spray.
I've not had to replace one on a coupe, but the sedan has a single bolt holding the glass to the regulator - is the glass properly seated/oriented?
There is a switch synchronization technique for the up/down - you should be able to find that with a Search.
Last edited by John in VA; 09-08-2024 at 06:53 AM.
2006 330ci ZHP - Silbergrau Metallic / Stoff Laser/Anthrazit / Alu Black Cube trim / Adaptive Xenon headlights / HK hi-fi system / heated front seats