Do you mean it goes back up on its own or when you press the "up" switch? If it reverses on its own, it has the "automatic-down" option and the computer thinks it is hitting an obstruction. There are two common causes of that. One is the regulator consists of a cable and plastic pulleys, and the cable is fraying apart and binding. The other is the rubber channels the glass slides in are gummed up with dirt or bug juice.
For gummed-up channels, spray them real well with silicone spray lube. That goes on like water, evaporates, and leaves a film of "slippery" behind.
If you mean the window goes back up that one inch when you press the "up" switch, the fraying cable is the best suspect.
Tuesday, August 22nd, 2017 AT 4:13 PM