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Fixed it. Re-installed original ac control module (same p/n 25936130). The DIC exterior temp display now showed accurate temp (72). Turned off ac/htr and removed unit with car running in park. Installed new unit and both temps read 72. Drove around for 20 minutes and watched temps change...

Have 2011 Tahoe LTZ with dual zone AC module under nav/radio display. Just replaced the AC module due to old unit having two stuck pushbuttons and decals rubbed away. Replaced with new GM unit. The ac/fan controls work fine, however, the new module displays the exterior temp - the old did not...