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Is any type of programming required for HVAC blend door actuator rear on 2002 trailblazer ext unit is located top airbox and downstream from the blower in right vehicle?

No, programming isn't typically required to replace a blend door actuator on a 2002 Trailblazer EXT. Replacing the actuator is a mechanical process involving removing the old part and installing the new one. The actuator itself is simply a motor that moves the blend door to control air temperature; it doesn't store any learned positions or require any electronic configuration after installation.
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