Student or Learner
Can we say "Please turn the car's window glass up or down"?
Assuming you are in the car, just say "Please open the window" or "Please close the window."
If you are inside and remember you left the car window down, you can say "Could you please go outside and close the car window?"
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.