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What will happen to a camera if it is taken to an environment beyond its operating temperature?

I have a canon t3i and I am curious to know just how much heat they can handle. I've seen proof that they can handle short bursts of direct fire, but long-term heat is another matter. I live in Texas and it's not uncommon for +110F temps in the summer.

If I leave that camera in the trunk - will it be ruined? Will the sensor quality go down? I want to take my camera with me everywhere - but if there is no air-conditioned area to keep the camera in I am worried I'll ruin it and be left without a camera.

According to Canon, I should not be using the camera above 104F/40C - but what about the non-working range where I have it sitting somewhere?