It's simple, just try and if no joy then we can make other presumptionsMy son mentioned his passenger side front window is running a bit slow.
If it isn't a misalignment or some obstruction can the motor be stripped, greased put back together again?
Had similar issue on my Focus and worked a treat.
Yes the sliders/wheels can have issues, they look like they’re made of nylon which eventually breaks up.Had a look and the glass is indeed rubbing on the vertical window channel, no silicone spray so wd40 did the trick until next time.
Plastic guide in the regulator channel is broken though, quite common by the looks of it.
There are aluminum replacements on eBay from Florida. I bought a set they are great. As stated on their eBay store:It would be a great repair kit if the plastic parts were available.