Hey second gen folks, I am hoping that their is a former first gen owner in this group who have accessed their evaporator in the past to clean out - the first gen cummins guys cut out a small section inside cab and then seal with a large (very large!) grommet. I have pulled a ton of debris out of my side vents and cowl and pulled blower motor and found more in there, I have working R-12 but based upon the dirt and junk already pulled out, I know I have a very dirty evaporator and would like to vac/shoot it with cool cleaner and rinse out. Here is a pic of the inside of my truck, anyone know where I should cut on the plastic to access my evaporator? Thank you so much! Truck is an '83 w250