2001 navigator not blowing heat

i've got a 2001 that is not blowing heat. I already changed out the thermostat and the temp gets up to operating temp, I have it set at 90 degrees but it is still blowing cold air. Anybody have any suggestions.

Anybody have any suggestions.

I suspect a Blend Door not functioning.
The 2001 should be have a the ability to run in test mode. Test mode will check the Blend Door too...

Blend door was working, the problem was a plugged heater core. Replaced that and now has heat but the air bag light stays on now. It flashes 3 then 2, so I'm guessing that is a 32 code. Did some searching online and it say a clock spring. Would this be the problem or is it possible I didn't hook something back up under the dash after reinstalling it.