[asphaltburner]

Yo! Yes!
I recall my Camaro doing the very same kind of "weird", pre "programmed" A/C things. I'm pretty sure it is designed to do just that for normal function of the air conditioning. I'll try to remember to look in my shop manual to see if I can find the explaination as to WHY it does that. I think the vent closes to outside air and cranks up the fan for max output to flood the car with cool air.
I DO believe you are experiencing normal function. Even with my Camaro rewired for heater only, I think mine still does this, but I only use the defrost, vent, and off positions.
Todd.