Do the rear vents in the Kia Sedona ever get warm?

[dansinger61]

I have a 2004 Kia Sedona. There are rear vents in the ceiling, presumably to distribute either warm or cold air to the rear seat occupants. However, I've noticed that, now that winter is here, the vents never deliver warm air; the air is always cold coming out of them.

Is this just a crappy design that I'll have to live with? Or is there something wrong with my car?