The car decides whether you need A/C or heat depending on the termperature you've selected vs. the temperature it senses in the cabin (and probably also the outside temperature that it detects via a sensor under the nose).

There'* no actual "A/C" button per se; the closest thing to that is the "AUTO" button, which allows the A/C compressor to run if the car decides that it needs to. Pressing the "Manual" button keeps the compressor off (i.e. no A/C), although heater operation is not affected.

I have '92 SSE. That is about the ONLY thing I do not like about my elec climate control. You really can't control where the hot air comes out. Man, I wish I could get warm air from the upper vents too. As far as I know it is either warm front widow or warm feet....no inbetween.

I sure hope the 2000+ models allow that. I'm getting ready to trade up........finally.

*ack* Brain fart... There'* no Manual button, right? I must have been thinking of the ECONomy button, or whatever the heck sits in between the AUTO button and the windshield defrost button in the little row below the display...

i have the same problem, and you just have to play with it for a while, i still havetn mastered it, and ive had mine for 2 years. sometimes it does what i want and sometimes it dont. then i get mad and stop playing with it

Right, you don't get to pick which duct(*) the air blows through, except for the Defrost setting which overrides and sends all air to the windshield ducts.