how do you disconnect the drain tube from the heather core 92 pontiac grand am?

[Rose G]

needing to replace my heater core, looked underneath the car. First step in my guide is to disconnect the drain tube, cant tell from what I am seeing how to disconnect it. Does it just pull out or is there a bracket somewhere I am not seeing.

 

[GREG M]

monkey

 

[wde3477]

The drain tube is for the A/C evaporator core. Shouldn't need to remove this - it should be attached to the ductwork, not the core itself.