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When I bought my Impala a few years ago (2008) the AC control unit was faulty, so I had it replaced. Immediately after that, the ambient temperature readout, which was working fine before, read "---F" like yours. I thought it just needed recalibrating or resetting, so I left it for a day or two. Didn't come back. Took it back to the dealer and it turns out that the new AC control unit had an updated firmware or something, and the ambient air temperature sensor didn't play nice with it. The dealer had to use their Tech 2 to update the software for the ambient air temperature sensor, and it came back on immediately.
Now, I don't know what work was done when your dealer serviced your 2011, but I'm willing to bet it's one of the following possibilities. Either A) it needs a software update, like mine or B) someone left something disconnected. Maybe C) the ambient air temperature sensor stopped working, but if it was working before it went to the dealer then I doubt that is what happened.
To "reset" the ambient air temperature sensor, press and hold the AC and re-circulation button simultaneously for about 3 to 5 seconds. If that does nothing, then I'd call your dealer and tell them to fix it.
Hope this helps.
08 Impala LTZ
Blackvue DR-470 2-Ch w/ PMP & GPS
Ultragauge MX 1.3
Dynomax 3" tips
Chevrolet Performance STBs + DR custom brackets
30% Llumar tint
Techno Steel interior trim / leather shifter
Reverse light / full interior / instrument cluster LED retrofit
LED headlights / fog lights
Stant locking gas cap
WeatherTech front liners / window deflectors
GM molded splash guards
Firestone Firehawk Wide Oval UHP