climate control blows cold air for 30 minutes

The last few days my 2005 Sierra is blowing cold air for 30 minutes, whether in auto mode or not, even with the temp dialed up to 90 degrees. Then it works fine after that. The temp gauge goes up to midscale within five minutes, just as it always has. Does this sound like something in the electronics of the climate control? Too cold here in MN to have this!

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jstein
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