Locate heater cable - '79 3/4 ton

[peevee]

I want to locate the "action" end of my temperature cable. The lever only moves about half way over to hot. I've checked behind the dash at the lever and the cable seems OK there. I suspect a jamming door or something in the heater box inside the cab on the firewall. How do I get access to this?
Thanks

Peter

[peevee]

OK, I've found what I was looking for by removing the glove box. But the movement of the flap (door) for temperature sees very limited. Maybe that's the way it's designed? Seems it should move more.

Peter

[Pontiac1976]

Yes some times the pivot move two areas flow. glad you got it fixed.