72-F250 A/C, does plastic face come off separately?

I've got an A/C unit on a 1972 F250. I don't know whether it's factory and the way they made 'em back then or if it's aftermarket. It bolts in under the
dash above the floor on the passenger side of the cab.
I'm trying to get the full shield face plate off so I can get to the core behind it. I'm either missing something or it attaches from behind and I have to drop the whole damn thing.
Anybody know about 'em? I'm apprecaite a little help. Well, maybe help is too strong a word. I can't afford a plane ticket for ya. :) Let's try "advice."
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