A door window may move slowly or stop in mid travel due to a failing power window motor. The affected window may start working again after the motor cools off. Replacing the faulty window motor will commonly correct this concern.Google+
Car Problem Reports
GMC S15 Jimmy Power Window Motors May Fail From Overheating
GMC S15 Jimmy Problem
Average Mileage: 111,000 mi (90,000 mi - 132,000 mi)
Visitor, 1991 GMC S15 Jimmy, 132,000 mi
Window stops either half way up or half way down. I have to wait several minutes before I can try to operate it again. Sometimes if I 'help it' it will work.