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How do I get to the heater control cable to adjust it?

(1990 Chevrolet Suburban 2500)
in Phoenix, AZ on December 28, 2011
the control switch for the heat will not go all the way to the right. i have the assembly out and it feels like the cable is too short to go all the way. I can't figure out what needs to be taken apart to reach the cable at its source.
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