with summer heat, i usually push my front windows down. but today after finishing lunch, started the car,push the window down, the passenger window is not working (luckily it's in closed pos). i still can hear the motor running up or down as i pushed. any idea ? thanks in advance.

 

Window regulator!!

 

here is the latest. i did use my hand to push or assist the slide up & down and it's worked. but look like something is broken inside. at the moment i don't have time may be after my return from camping this weekend.