Blowing cold air

[norm]

First, the vehicle. 2005 Silverado with the dual automatic climate controls.

The problem. I start the truck in the morning to let it warm up and it just blows cold air. The temp gauge shows 210 degrees which makes me think the thermostat is working properly. It will keep blowing cold air if its idling or just driving around town slowly. It does finally blow hot air when I get going on the highway on the way to work. Any ideas?

[Jeremy airjer W]

Hows the coolant level in the radiator? (check when the engine is cold!)

What does the coolant look like, clean or nasty?

[shizzy]

is the temp consistant or does it swing violently?