Air actuator question (95 Tahoe)

[95Escahoe]

I have a question about the air actuators in my 95 Tahoe its a 4dr if it matters no rear heat or air, I know there is an actuator in the dash in the box the heater core is in that one controls the air coming in correct? Then there is one to the right of the gas pedal what does that one do? And any others or that's it, thanks for the help

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