My Bmw e-36 sunroof doesnt open it makes a

check for any obstructing rain/weather strips along the short sides of the sun roof that may be obstructing the glass, another test you can do is where the sunroof switch is located there is a greater piece of the headliner that you can pry off. there you will see the motor of the sunroof. Use a 7mm alan tool to manually open the sunroof so you can observe any obstructions.