Sixto,
Here is some info. on the actuator in the door. It might be bad or like you said the line might be cracked or off. This says drivers door but the picture looks like the pasengers side. Alldata might have gotten the pictures mixed up.
Driver's Door Actuator
Pneumatic line (6)
Lever off.
Sliding sleeve (16)
Push back.
Shift rod (14)
Press out.
Bolt (12)
Unscrew and remove.
Actuator
Unhook