The power window on my son's 2008 Wrangler JK rolls down fine. But it won't come up on it's own unless you pull up on it. I thought it was the motor so I replacement it with a new one. Same problem. I sprayed a bunch of silicone on the rubber window channels, both front and back and it came up fine for a while. But now it's back to not working right again. Anybody else have this problem?

 

I have not had that problem. It sounds like if you help it a little it goes up so it isn't the switch. You replaced the motor so you know that is good. I am thinking it must be binding on something. There has to a worn piece causing the bind. I would look at all the connecting points and travel path very closely.

 

Sounds like a bad window regulator.