Heater core

DemonK9 said
Not necessary to take dash out, BUT if you take out the glove box liner (4-6 screws, then folds in half to remove out the front) you will be able to see and access the heater cable control on top of box & electrical connection(s) through glove box opening. Makes it a bit easier than feeling around blind from underneath.

Definitely appreciate that assist. Every bit helps, especially, in my case. As my body is old enough (I try to stay younger & mentally, it works pretty good, BUT, the body doesn't always cooperate.) and anything that helps, is Greatly appreciated.