83 300td heater core, how to remove

Seems I can't get to the heater core on my 83 300 sedan, is there a simple way to remove it? The rest of the car was simple.

Thanks for any help. tsk tsk.

[engatwork]

Dash has to come out. From what I have heard - not real hard (but not easy) to do on these cars but you will want to use the manual. The heater core is buried in the hvac system housing.

Thank you very much, I'm sure I will enjoy doing the dash etc. tsk tsk.